diff --git a/docs/start/framework/react/guide/isr.md b/docs/start/framework/react/guide/isr.md
index 7141ad20024..600a282c201 100644
--- a/docs/start/framework/react/guide/isr.md
+++ b/docs/start/framework/react/guide/isr.md
@@ -81,7 +81,6 @@ Server functions can also set cache headers for dynamic data endpoints:
 ```tsx
 // routes/api/products/$productId.ts
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 
 export const Route = createFileRoute('/api/products/$productId')({
   server: {
@@ -89,7 +88,7 @@ export const Route = createFileRoute('/api/products/$productId')({
       GET: async ({ params, request }) => {
         const product = await db.products.findById(params.productId)
 
-        return json(
+        return Response.json(
           { product },
           {
             headers: {
@@ -113,7 +112,6 @@ For API routes, you can use middleware to set cache headers:
 // routes/api/products/$productId.ts
 import { createFileRoute } from '@tanstack/react-router'
 import { createMiddleware } from '@tanstack/react-start'
-import { json } from '@tanstack/react-start'
 
 const cacheMiddleware = createMiddleware().server(async ({ next }) => {
   const result = await next()
@@ -133,7 +131,7 @@ export const Route = createFileRoute('/api/products/$productId')({
     handlers: {
       GET: async ({ params }) => {
         const product = await db.products.findById(params.productId)
-        return json({ product })
+        return Response.json({ product })
       },
     },
   },
@@ -164,7 +162,6 @@ While time-based revalidation works well for most cases, you may need to invalid
 ```tsx
 // routes/api/revalidate.ts
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 
 export const Route = createFileRoute('/api/revalidate')({
   server: {
@@ -174,7 +171,7 @@ export const Route = createFileRoute('/api/revalidate')({
 
         // Verify secret token
         if (secret !== process.env.REVALIDATE_SECRET) {
-          return json({ error: 'Invalid token' }, { status: 401 })
+          return Response.json({ error: 'Invalid token' }, { status: 401 })
         }
 
         // Trigger CDN purge via your CDN's API
@@ -192,7 +189,7 @@ export const Route = createFileRoute('/api/revalidate')({
           },
         )
 
-        return json({ revalidated: true })
+        return Response.json({ revalidated: true })
       },
     },
   },
diff --git a/docs/start/framework/react/guide/observability.md b/docs/start/framework/react/guide/observability.md
index f6d6abf5fa8..71d39d16ce8 100644
--- a/docs/start/framework/react/guide/observability.md
+++ b/docs/start/framework/react/guide/observability.md
@@ -128,7 +128,7 @@ export const Route = createFileRoute('/api/users')({
     middleware: [requestLogger],
     handlers: {
       GET: async () => {
-        return json({ users: await getUsers() })
+        return Response.json({ users: await getUsers() })
       },
     },
   },
@@ -185,7 +185,6 @@ Create server routes for health monitoring:
 ```tsx
 // routes/health.ts
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 
 export const Route = createFileRoute('/health')({
   server: {
@@ -200,7 +199,7 @@ export const Route = createFileRoute('/health')({
           version: process.env.npm_package_version,
         }
 
-        return json(checks)
+        return Response.json(checks)
       },
     },
   },
@@ -314,7 +313,7 @@ export const Route = createFileRoute('/metrics')({
   server: {
     handlers: {
       GET: async () => {
-        return json({
+        return Response.json({
           system: {
             uptime: process.uptime(),
             memory: process.memoryUsage(),
@@ -459,7 +458,7 @@ export const Route = createFileRoute('/admin/errors')({
           ...data,
         }))
 
-        return json({ errors })
+        return Response.json({ errors })
       },
     },
   },
diff --git a/docs/start/framework/react/guide/server-routes.md b/docs/start/framework/react/guide/server-routes.md
index 74b636da458..55e94d36d29 100644
--- a/docs/start/framework/react/guide/server-routes.md
+++ b/docs/start/framework/react/guide/server-routes.md
@@ -367,20 +367,19 @@ export const Route = createFileRoute('/hello')({
 // {"message":"Hello, World!"}
 ```
 
-## Using the `json` helper function
+## Using the `Response.json` helper function
 
-Or you can use the `json` helper function to automatically set the `Content-Type` header to `application/json` and serialize the JSON object for you.
+Or you can use the [`Response.json`](https://developer.mozilla.org/en-US/docs/Web/API/Response/json_static) helper function to automatically set the `Content-Type` header to `application/json` and serialize the JSON object for you.
 
 ```ts
 // routes/hello.ts
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 
 export const Route = createFileRoute('/hello')({
   server: {
     handlers: {
       GET: async ({ request }) => {
-        return json({ message: 'Hello, World!' })
+        return Response.json({ message: 'Hello, World!' })
       },
     },
   },
@@ -397,7 +396,6 @@ You can set the status code of the response by passing it as a property of the s
 ```ts
 // routes/hello.ts
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 
 export const Route = createFileRoute('/hello')({
   server: {
@@ -409,7 +407,7 @@ export const Route = createFileRoute('/hello')({
             status: 404,
           })
         }
-        return json(user)
+        return Response.json(user)
       },
     },
   },
diff --git a/docs/start/framework/solid/guide/observability.md b/docs/start/framework/solid/guide/observability.md
index 5999bd56d45..20b5827c3af 100644
--- a/docs/start/framework/solid/guide/observability.md
+++ b/docs/start/framework/solid/guide/observability.md
@@ -128,7 +128,7 @@ export const Route = createFileRoute('/api/users')({
     middleware: [requestLogger],
     handlers: {
       GET: async () => {
-        return json({ users: await getUsers() })
+        return Response.json({ users: await getUsers() })
       },
     },
   },
@@ -185,7 +185,6 @@ Create server routes for health monitoring:
 ```tsx
 // routes/health.ts
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 
 export const Route = createFileRoute('/health')({
   server: {
@@ -200,7 +199,7 @@ export const Route = createFileRoute('/health')({
           version: process.env.npm_package_version,
         }
 
-        return json(checks)
+        return Response.json(checks)
       },
     },
   },
@@ -314,7 +313,7 @@ export const Route = createFileRoute('/metrics')({
   server: {
     handlers: {
       GET: async () => {
-        return json({
+        return Response.json({
           system: {
             uptime: process.uptime(),
             memory: process.memoryUsage(),
@@ -459,7 +458,7 @@ export const Route = createFileRoute('/admin/errors')({
           ...data,
         }))
 
-        return json({ errors })
+        return Response.json({ errors })
       },
     },
   },
diff --git a/docs/start/framework/solid/guide/server-routes.md b/docs/start/framework/solid/guide/server-routes.md
index 2117cee6615..3e5481bb977 100644
--- a/docs/start/framework/solid/guide/server-routes.md
+++ b/docs/start/framework/solid/guide/server-routes.md
@@ -367,20 +367,19 @@ export const Route = createFileRoute('/hello')({
 // {"message":"Hello, World!"}
 ```
 
-## Using the `json` helper function
+## Using the `Response.json` helper function
 
-Or you can use the `json` helper function to automatically set the `Content-Type` header to `application/json` and serialize the JSON object for you.
+Or you can use the [`Response.json`](https://developer.mozilla.org/en-US/docs/Web/API/Response/json_static) helper function to automatically set the `Content-Type` header to `application/json` and serialize the JSON object for you.
 
 ```ts
 // routes/hello.ts
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 
 export const Route = createFileRoute('/hello')({
   server: {
     handlers: {
       GET: async ({ request }) => {
-        return json({ message: 'Hello, World!' })
+        return Response.json({ message: 'Hello, World!' })
       },
     },
   },
@@ -397,7 +396,6 @@ You can set the status code of the response by passing it as a property of the s
 ```ts
 // routes/hello.ts
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 
 export const Route = createFileRoute('/hello')({
   server: {
@@ -409,7 +407,7 @@ export const Route = createFileRoute('/hello')({
             status: 404,
           })
         }
-        return json(user)
+        return Response.json(user)
       },
     },
   },
diff --git a/e2e/react-start/basic-react-query/src/routes/api.users.ts b/e2e/react-start/basic-react-query/src/routes/api.users.ts
index 454aca50a06..bb37c6e68da 100644
--- a/e2e/react-start/basic-react-query/src/routes/api.users.ts
+++ b/e2e/react-start/basic-react-query/src/routes/api.users.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 import type { User } from '../utils/users'
 
@@ -16,7 +15,7 @@ export const Route = createFileRoute('/api/users')({
         console.info('Fetching users... @', request.url)
         const res = await axios.get<Array<User>>(`${queryURL}/users`)
         const list = res.data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/react-start/basic-react-query/src/routes/api/users.$id.ts b/e2e/react-start/basic-react-query/src/routes/api/users.$id.ts
index 70ad77d76b3..e11e0396521 100644
--- a/e2e/react-start/basic-react-query/src/routes/api/users.$id.ts
+++ b/e2e/react-start/basic-react-query/src/routes/api/users.$id.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 import type { User } from '../../utils/users'
 
@@ -16,14 +15,14 @@ export const Route = createFileRoute('/api/users/$id')({
         console.info(`Fetching users by id=${params.id}... @`, request.url)
         try {
           const res = await axios.get<User>(`${queryURL}/users/` + params.id)
-          return json({
+          return Response.json({
             id: res.data.id,
             name: res.data.name,
             email: res.data.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/react-start/basic/src/routes/api.users.ts b/e2e/react-start/basic/src/routes/api.users.ts
index a03076490b8..9e055549ef7 100644
--- a/e2e/react-start/basic/src/routes/api.users.ts
+++ b/e2e/react-start/basic/src/routes/api.users.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 
 import type { User } from '~/utils/users'
@@ -19,7 +18,7 @@ export const Route = createFileRoute('/api/users')({
 
         const list = res.data.slice(0, 10)
 
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/react-start/basic/src/routes/api/users.$id.ts b/e2e/react-start/basic/src/routes/api/users.$id.ts
index 2d2c279e931..ac665381f1f 100644
--- a/e2e/react-start/basic/src/routes/api/users.$id.ts
+++ b/e2e/react-start/basic/src/routes/api/users.$id.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 import type { User } from '~/utils/users'
 
@@ -17,14 +16,14 @@ export const Route = createFileRoute('/api/users/$id')({
         try {
           const res = await axios.get<User>(`${queryURL}/users/` + params.id)
 
-          return json({
+          return Response.json({
             id: res.data.id,
             name: res.data.name,
             email: res.data.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/react-start/custom-basepath/src/routes/api.users.ts b/e2e/react-start/custom-basepath/src/routes/api.users.ts
index a03076490b8..9e055549ef7 100644
--- a/e2e/react-start/custom-basepath/src/routes/api.users.ts
+++ b/e2e/react-start/custom-basepath/src/routes/api.users.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 
 import type { User } from '~/utils/users'
@@ -19,7 +18,7 @@ export const Route = createFileRoute('/api/users')({
 
         const list = res.data.slice(0, 10)
 
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/react-start/custom-basepath/src/routes/api/users.$id.ts b/e2e/react-start/custom-basepath/src/routes/api/users.$id.ts
index 5a2b9fe6216..57682660fdf 100644
--- a/e2e/react-start/custom-basepath/src/routes/api/users.$id.ts
+++ b/e2e/react-start/custom-basepath/src/routes/api/users.$id.ts
@@ -1,4 +1,3 @@
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 import type { User } from '~/utils/users'
 import { createFileRoute } from '@tanstack/react-router'
@@ -17,14 +16,14 @@ export const Route = createFileRoute('/api/users/$id')({
         try {
           const res = await axios.get<User>(`${queryURL}/users/` + params.id)
 
-          return json({
+          return Response.json({
             id: res.data.id,
             name: res.data.name,
             email: res.data.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/react-start/server-routes/src/routes/api/middleware-context.ts b/e2e/react-start/server-routes/src/routes/api/middleware-context.ts
index e897aa9a3a2..61fff4020e0 100644
--- a/e2e/react-start/server-routes/src/routes/api/middleware-context.ts
+++ b/e2e/react-start/server-routes/src/routes/api/middleware-context.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { createMiddleware, json } from '@tanstack/react-start'
+import { createMiddleware } from '@tanstack/react-start'
 
 const testParentMiddleware = createMiddleware().server(async ({ next }) => {
   const result = await next({ context: { testParent: true } })
@@ -18,7 +18,7 @@ export const Route = createFileRoute('/api/middleware-context')({
     middleware: [testMiddleware],
     handlers: {
       GET: ({ request, context }) => {
-        return json({
+        return Response.json({
           url: request.url,
           context: context,
           expectedContext: { testParent: true, test: true },
diff --git a/e2e/react-start/server-routes/src/routes/api/only-any.ts b/e2e/react-start/server-routes/src/routes/api/only-any.ts
index d99a060f7bc..f502e0c4961 100644
--- a/e2e/react-start/server-routes/src/routes/api/only-any.ts
+++ b/e2e/react-start/server-routes/src/routes/api/only-any.ts
@@ -1,11 +1,10 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 
 export const Route = createFileRoute('/api/only-any')({
   server: {
     handlers: {
       ANY: ({ request }) => {
-        return json(
+        return Response.json(
           {
             handler: 'ANY',
             method: request.method,
diff --git a/e2e/solid-start/basic-solid-query/src/routes/api.users.ts b/e2e/solid-start/basic-solid-query/src/routes/api.users.ts
index 37e6e2f9c3f..54859a701ed 100644
--- a/e2e/solid-start/basic-solid-query/src/routes/api.users.ts
+++ b/e2e/solid-start/basic-solid-query/src/routes/api.users.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import axios from 'redaxios'
 import type { User } from '../utils/users'
 
@@ -16,7 +15,7 @@ export const Route = createFileRoute('/api/users')({
         console.info('Fetching users... @', request.url)
         const res = await axios.get<Array<User>>(`${queryURL}/users`)
         const list = res.data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/solid-start/basic-solid-query/src/routes/api/users.$id.ts b/e2e/solid-start/basic-solid-query/src/routes/api/users.$id.ts
index 4a1503f0d75..a7b2e444911 100644
--- a/e2e/solid-start/basic-solid-query/src/routes/api/users.$id.ts
+++ b/e2e/solid-start/basic-solid-query/src/routes/api/users.$id.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import axios from 'redaxios'
 import type { User } from '../../utils/users'
 
@@ -16,14 +15,14 @@ export const Route = createFileRoute('/api/users/$id')({
         console.info(`Fetching users by id=${params.id}... @`, request.url)
         try {
           const res = await axios.get<User>(`${queryURL}/users/` + params.id)
-          return json({
+          return Response.json({
             id: res.data.id,
             name: res.data.name,
             email: res.data.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/solid-start/basic/src/routes/api/users.$userId.ts b/e2e/solid-start/basic/src/routes/api/users.$userId.ts
index 7f637260f51..6c583f26194 100644
--- a/e2e/solid-start/basic/src/routes/api/users.$userId.ts
+++ b/e2e/solid-start/basic/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 let queryURL = 'https://jsonplaceholder.typicode.com'
@@ -19,14 +18,14 @@ export const Route = createFileRoute('/api/users/$userId')({
             throw new Error('Failed to fetch user')
           }
           const user = (await res.json()) as User
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/solid-start/basic/src/routes/api/users.ts b/e2e/solid-start/basic/src/routes/api/users.ts
index 04aec562e14..3d0a2f1116f 100644
--- a/e2e/solid-start/basic/src/routes/api/users.ts
+++ b/e2e/solid-start/basic/src/routes/api/users.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { createMiddleware, json } from '@tanstack/solid-start'
+import { createMiddleware } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(
@@ -56,7 +56,7 @@ export const Route = createFileRoute('/api/users')({
         }
         const data = (await res.json()) as Array<User>
         const list = data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/solid-start/custom-basepath/src/routes/api/users.$userId.ts b/e2e/solid-start/custom-basepath/src/routes/api/users.$userId.ts
index 7f637260f51..6c583f26194 100644
--- a/e2e/solid-start/custom-basepath/src/routes/api/users.$userId.ts
+++ b/e2e/solid-start/custom-basepath/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 let queryURL = 'https://jsonplaceholder.typicode.com'
@@ -19,14 +18,14 @@ export const Route = createFileRoute('/api/users/$userId')({
             throw new Error('Failed to fetch user')
           }
           const user = (await res.json()) as User
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/solid-start/custom-basepath/src/routes/api/users.ts b/e2e/solid-start/custom-basepath/src/routes/api/users.ts
index 04aec562e14..3d0a2f1116f 100644
--- a/e2e/solid-start/custom-basepath/src/routes/api/users.ts
+++ b/e2e/solid-start/custom-basepath/src/routes/api/users.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { createMiddleware, json } from '@tanstack/solid-start'
+import { createMiddleware } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(
@@ -56,7 +56,7 @@ export const Route = createFileRoute('/api/users')({
         }
         const data = (await res.json()) as Array<User>
         const list = data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/solid-start/server-routes/src/routes/api/middleware-context.ts b/e2e/solid-start/server-routes/src/routes/api/middleware-context.ts
index cd50ed71974..662012ef594 100644
--- a/e2e/solid-start/server-routes/src/routes/api/middleware-context.ts
+++ b/e2e/solid-start/server-routes/src/routes/api/middleware-context.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { createMiddleware, json } from '@tanstack/solid-start'
+import { createMiddleware } from '@tanstack/solid-start'
 
 const testParentMiddleware = createMiddleware().server(async ({ next }) => {
   const result = await next({ context: { testParent: true } })
@@ -18,7 +18,7 @@ export const Route = createFileRoute('/api/middleware-context')({
     middleware: [testMiddleware],
     handlers: {
       GET: ({ request, context }) => {
-        return json({
+        return Response.json({
           url: request.url,
           context: context,
           expectedContext: { testParent: true, test: true },
diff --git a/e2e/solid-start/server-routes/src/routes/api/only-any.ts b/e2e/solid-start/server-routes/src/routes/api/only-any.ts
index b8919245ca9..eeafa8c6f01 100644
--- a/e2e/solid-start/server-routes/src/routes/api/only-any.ts
+++ b/e2e/solid-start/server-routes/src/routes/api/only-any.ts
@@ -1,11 +1,10 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 
 export const Route = createFileRoute('/api/only-any')({
   server: {
     handlers: {
       ANY: ({ request }) => {
-        return json(
+        return Response.json(
           {
             handler: 'ANY',
             method: request.method,
diff --git a/e2e/vue-start/basic-vue-query/src/routes/api.users.ts b/e2e/vue-start/basic-vue-query/src/routes/api.users.ts
index 30be1cc574f..cab4cafc3f6 100644
--- a/e2e/vue-start/basic-vue-query/src/routes/api.users.ts
+++ b/e2e/vue-start/basic-vue-query/src/routes/api.users.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { json } from '@tanstack/vue-start'
 import axios from 'redaxios'
 import type { User } from '../utils/users'
 
@@ -16,7 +15,7 @@ export const Route = createFileRoute('/api/users')({
         console.info('Fetching users... @', request.url)
         const res = await axios.get<Array<User>>(`${queryURL}/users`)
         const list = res.data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/vue-start/basic-vue-query/src/routes/api/users.$id.ts b/e2e/vue-start/basic-vue-query/src/routes/api/users.$id.ts
index 5f3713e8c84..4cc4b33a0b8 100644
--- a/e2e/vue-start/basic-vue-query/src/routes/api/users.$id.ts
+++ b/e2e/vue-start/basic-vue-query/src/routes/api/users.$id.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { json } from '@tanstack/vue-start'
 import axios from 'redaxios'
 import type { User } from '../../utils/users'
 
@@ -16,14 +15,14 @@ export const Route = createFileRoute('/api/users/$id')({
         console.info(`Fetching users by id=${params.id}... @`, request.url)
         try {
           const res = await axios.get<User>(`${queryURL}/users/` + params.id)
-          return json({
+          return Response.json({
             id: res.data.id,
             name: res.data.name,
             email: res.data.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/vue-start/basic/src/routes/api/users.$userId.ts b/e2e/vue-start/basic/src/routes/api/users.$userId.ts
index 5c55163c7f5..50b9ca995a9 100644
--- a/e2e/vue-start/basic/src/routes/api/users.$userId.ts
+++ b/e2e/vue-start/basic/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { json } from '@tanstack/vue-start'
 import type { User } from '~/utils/users'
 
 let queryURL = 'https://jsonplaceholder.typicode.com'
@@ -19,14 +18,14 @@ export const Route = createFileRoute('/api/users/$userId')({
             throw new Error('Failed to fetch user')
           }
           const user = (await res.json()) as User
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/vue-start/basic/src/routes/api/users.ts b/e2e/vue-start/basic/src/routes/api/users.ts
index 5f2ab51270e..97989b93ca3 100644
--- a/e2e/vue-start/basic/src/routes/api/users.ts
+++ b/e2e/vue-start/basic/src/routes/api/users.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { createMiddleware, json } from '@tanstack/vue-start'
+import { createMiddleware } from '@tanstack/vue-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(
@@ -56,7 +56,7 @@ export const Route = createFileRoute('/api/users')({
         }
         const data = (await res.json()) as Array<User>
         const list = data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/vue-start/custom-basepath/src/routes/api/users.$userId.ts b/e2e/vue-start/custom-basepath/src/routes/api/users.$userId.ts
index 5c55163c7f5..50b9ca995a9 100644
--- a/e2e/vue-start/custom-basepath/src/routes/api/users.$userId.ts
+++ b/e2e/vue-start/custom-basepath/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { json } from '@tanstack/vue-start'
 import type { User } from '~/utils/users'
 
 let queryURL = 'https://jsonplaceholder.typicode.com'
@@ -19,14 +18,14 @@ export const Route = createFileRoute('/api/users/$userId')({
             throw new Error('Failed to fetch user')
           }
           const user = (await res.json()) as User
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/e2e/vue-start/custom-basepath/src/routes/api/users.ts b/e2e/vue-start/custom-basepath/src/routes/api/users.ts
index 5f2ab51270e..97989b93ca3 100644
--- a/e2e/vue-start/custom-basepath/src/routes/api/users.ts
+++ b/e2e/vue-start/custom-basepath/src/routes/api/users.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { createMiddleware, json } from '@tanstack/vue-start'
+import { createMiddleware } from '@tanstack/vue-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(
@@ -56,7 +56,7 @@ export const Route = createFileRoute('/api/users')({
         }
         const data = (await res.json()) as Array<User>
         const list = data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/e2e/vue-start/server-routes/src/routes/api/middleware-context.ts b/e2e/vue-start/server-routes/src/routes/api/middleware-context.ts
index d780d2ebb7b..c3756d0410b 100644
--- a/e2e/vue-start/server-routes/src/routes/api/middleware-context.ts
+++ b/e2e/vue-start/server-routes/src/routes/api/middleware-context.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { createMiddleware, json } from '@tanstack/vue-start'
+import { createMiddleware } from '@tanstack/vue-start'
 
 const testParentMiddleware = createMiddleware().server(async ({ next }) => {
   const result = await next({ context: { testParent: true } })
@@ -18,7 +18,7 @@ export const Route = createFileRoute('/api/middleware-context')({
     middleware: [testMiddleware],
     handlers: {
       GET: ({ request, context }) => {
-        return json({
+        return Response.json({
           url: request.url,
           context: context,
           expectedContext: { testParent: true, test: true },
diff --git a/e2e/vue-start/server-routes/src/routes/api/only-any.ts b/e2e/vue-start/server-routes/src/routes/api/only-any.ts
index ded160acc18..493688c9c11 100644
--- a/e2e/vue-start/server-routes/src/routes/api/only-any.ts
+++ b/e2e/vue-start/server-routes/src/routes/api/only-any.ts
@@ -1,11 +1,10 @@
 import { createFileRoute } from '@tanstack/vue-router'
-import { json } from '@tanstack/vue-start'
 
 export const Route = createFileRoute('/api/only-any')({
   server: {
     handlers: {
       ANY: ({ request }) => {
-        return json(
+        return Response.json(
           {
             handler: 'ANY',
             method: request.method,
diff --git a/examples/react/start-basic-cloudflare/src/routes/api/users.$userId.ts b/examples/react/start-basic-cloudflare/src/routes/api/users.$userId.ts
index 2ae7eb9c044..ee34d7a1898 100644
--- a/examples/react/start-basic-cloudflare/src/routes/api/users.$userId.ts
+++ b/examples/react/start-basic-cloudflare/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import type { User } from '~/utils/users'
 
 export const Route = createFileRoute('/api/users/$userId')({
@@ -17,14 +16,14 @@ export const Route = createFileRoute('/api/users/$userId')({
 
           const user = (await res.json()) as User
 
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/react/start-basic-cloudflare/src/routes/api/users.ts b/examples/react/start-basic-cloudflare/src/routes/api/users.ts
index c1e7473b0ce..4cecd018525 100644
--- a/examples/react/start-basic-cloudflare/src/routes/api/users.ts
+++ b/examples/react/start-basic-cloudflare/src/routes/api/users.ts
@@ -1,6 +1,6 @@
 import { createFileRoute } from '@tanstack/react-router'
 import { getRequestHeaders } from '@tanstack/react-start/server'
-import { createMiddleware, json } from '@tanstack/react-start'
+import { createMiddleware } from '@tanstack/react-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(async ({ next }) => {
@@ -54,7 +54,7 @@ export const Route = createFileRoute('/api/users')({
 
         const list = data.slice(0, 10)
 
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/examples/react/start-basic-react-query/src/routes/api/users.$id.ts b/examples/react/start-basic-react-query/src/routes/api/users.$id.ts
index 79c38d41a68..fd2becb76c9 100644
--- a/examples/react/start-basic-react-query/src/routes/api/users.$id.ts
+++ b/examples/react/start-basic-react-query/src/routes/api/users.$id.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 import type { User } from '../../utils/users'
 
@@ -12,14 +11,14 @@ export const Route = createFileRoute('/api/users/$id')({
           const res = await axios.get<User>(
             'https://jsonplaceholder.typicode.com/users/' + params.id,
           )
-          return json({
+          return Response.json({
             id: res.data.id,
             name: res.data.name,
             email: res.data.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/react/start-basic-react-query/src/routes/api/users.ts b/examples/react/start-basic-react-query/src/routes/api/users.ts
index 0e290833bb6..68fbdfcff0d 100644
--- a/examples/react/start-basic-react-query/src/routes/api/users.ts
+++ b/examples/react/start-basic-react-query/src/routes/api/users.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import axios from 'redaxios'
 import type { User } from '../../utils/users'
 
@@ -12,7 +11,7 @@ export const Route = createFileRoute('/api/users')({
           'https://jsonplaceholder.typicode.com/users',
         )
         const list = res.data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/examples/react/start-basic/src/routes/api/users.$userId.ts b/examples/react/start-basic/src/routes/api/users.$userId.ts
index 2ae7eb9c044..ee34d7a1898 100644
--- a/examples/react/start-basic/src/routes/api/users.$userId.ts
+++ b/examples/react/start-basic/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/react-router'
-import { json } from '@tanstack/react-start'
 import type { User } from '~/utils/users'
 
 export const Route = createFileRoute('/api/users/$userId')({
@@ -17,14 +16,14 @@ export const Route = createFileRoute('/api/users/$userId')({
 
           const user = (await res.json()) as User
 
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/react/start-basic/src/routes/api/users.ts b/examples/react/start-basic/src/routes/api/users.ts
index c1e7473b0ce..4cecd018525 100644
--- a/examples/react/start-basic/src/routes/api/users.ts
+++ b/examples/react/start-basic/src/routes/api/users.ts
@@ -1,6 +1,6 @@
 import { createFileRoute } from '@tanstack/react-router'
 import { getRequestHeaders } from '@tanstack/react-start/server'
-import { createMiddleware, json } from '@tanstack/react-start'
+import { createMiddleware } from '@tanstack/react-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(async ({ next }) => {
@@ -54,7 +54,7 @@ export const Route = createFileRoute('/api/users')({
 
         const list = data.slice(0, 10)
 
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/examples/solid/start-basic-cloudflare/src/routes/api/users.$userId.ts b/examples/solid/start-basic-cloudflare/src/routes/api/users.$userId.ts
index 8f31b7a8900..b65c0396c4f 100644
--- a/examples/solid/start-basic-cloudflare/src/routes/api/users.$userId.ts
+++ b/examples/solid/start-basic-cloudflare/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 export const Route = createFileRoute('/api/users/$userId')({
@@ -18,14 +17,14 @@ export const Route = createFileRoute('/api/users/$userId')({
           // eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
           const user = (await res.json()) as User
 
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/solid/start-basic-cloudflare/src/routes/api/users.ts b/examples/solid/start-basic-cloudflare/src/routes/api/users.ts
index a9d6505508b..a6542d11bd7 100644
--- a/examples/solid/start-basic-cloudflare/src/routes/api/users.ts
+++ b/examples/solid/start-basic-cloudflare/src/routes/api/users.ts
@@ -1,6 +1,6 @@
 import { createFileRoute } from '@tanstack/solid-router'
 import { getRequestHeaders } from '@tanstack/solid-start/server'
-import { createMiddleware, json } from '@tanstack/solid-start'
+import { createMiddleware } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(async ({ next }) => {
@@ -55,7 +55,7 @@ export const Route = createFileRoute('/api/users')({
 
         const list = data.slice(0, 10)
 
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/examples/solid/start-basic-netlify/src/routes/api/users.$userId.ts b/examples/solid/start-basic-netlify/src/routes/api/users.$userId.ts
index 8f31b7a8900..b65c0396c4f 100644
--- a/examples/solid/start-basic-netlify/src/routes/api/users.$userId.ts
+++ b/examples/solid/start-basic-netlify/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 export const Route = createFileRoute('/api/users/$userId')({
@@ -18,14 +17,14 @@ export const Route = createFileRoute('/api/users/$userId')({
           // eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
           const user = (await res.json()) as User
 
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/solid/start-basic-netlify/src/routes/api/users.ts b/examples/solid/start-basic-netlify/src/routes/api/users.ts
index a9d6505508b..a6542d11bd7 100644
--- a/examples/solid/start-basic-netlify/src/routes/api/users.ts
+++ b/examples/solid/start-basic-netlify/src/routes/api/users.ts
@@ -1,6 +1,6 @@
 import { createFileRoute } from '@tanstack/solid-router'
 import { getRequestHeaders } from '@tanstack/solid-start/server'
-import { createMiddleware, json } from '@tanstack/solid-start'
+import { createMiddleware } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(async ({ next }) => {
@@ -55,7 +55,7 @@ export const Route = createFileRoute('/api/users')({
 
         const list = data.slice(0, 10)
 
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/examples/solid/start-basic-nitro/src/routes/api/users.$userId.ts b/examples/solid/start-basic-nitro/src/routes/api/users.$userId.ts
index 8f31b7a8900..b65c0396c4f 100644
--- a/examples/solid/start-basic-nitro/src/routes/api/users.$userId.ts
+++ b/examples/solid/start-basic-nitro/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 export const Route = createFileRoute('/api/users/$userId')({
@@ -18,14 +17,14 @@ export const Route = createFileRoute('/api/users/$userId')({
           // eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
           const user = (await res.json()) as User
 
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/solid/start-basic-nitro/src/routes/api/users.ts b/examples/solid/start-basic-nitro/src/routes/api/users.ts
index a9d6505508b..a6542d11bd7 100644
--- a/examples/solid/start-basic-nitro/src/routes/api/users.ts
+++ b/examples/solid/start-basic-nitro/src/routes/api/users.ts
@@ -1,6 +1,6 @@
 import { createFileRoute } from '@tanstack/solid-router'
 import { getRequestHeaders } from '@tanstack/solid-start/server'
-import { createMiddleware, json } from '@tanstack/solid-start'
+import { createMiddleware } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(async ({ next }) => {
@@ -55,7 +55,7 @@ export const Route = createFileRoute('/api/users')({
 
         const list = data.slice(0, 10)
 
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/examples/solid/start-basic-solid-query/src/routes/api/users.$id.ts b/examples/solid/start-basic-solid-query/src/routes/api/users.$id.ts
index ef13c22ab24..47d0b2e7a49 100644
--- a/examples/solid/start-basic-solid-query/src/routes/api/users.$id.ts
+++ b/examples/solid/start-basic-solid-query/src/routes/api/users.$id.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import axios from 'redaxios'
 import type { User } from '../../utils/users'
 
@@ -12,14 +11,14 @@ export const Route = createFileRoute('/api/users/$id')({
           const res = await axios.get<User>(
             'https://jsonplaceholder.typicode.com/users/' + params.id,
           )
-          return json({
+          return Response.json({
             id: res.data.id,
             name: res.data.name,
             email: res.data.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/solid/start-basic-solid-query/src/routes/api/users.ts b/examples/solid/start-basic-solid-query/src/routes/api/users.ts
index f0f272a8c4c..9a6a3d65aec 100644
--- a/examples/solid/start-basic-solid-query/src/routes/api/users.ts
+++ b/examples/solid/start-basic-solid-query/src/routes/api/users.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import axios from 'redaxios'
 import type { User } from '../../utils/users'
 
@@ -12,7 +11,7 @@ export const Route = createFileRoute('/api/users')({
           'https://jsonplaceholder.typicode.com/users',
         )
         const list = res.data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/examples/solid/start-basic/src/routes/api/users.$userId.ts b/examples/solid/start-basic/src/routes/api/users.$userId.ts
index 65e5da00fc7..32a658cb4b7 100644
--- a/examples/solid/start-basic/src/routes/api/users.$userId.ts
+++ b/examples/solid/start-basic/src/routes/api/users.$userId.ts
@@ -1,5 +1,4 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { json } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 export const Route = createFileRoute('/api/users/$userId')({
@@ -15,14 +14,14 @@ export const Route = createFileRoute('/api/users/$userId')({
             throw new Error('Failed to fetch user')
           }
           const user = (await res.json()) as User
-          return json({
+          return Response.json({
             id: user.id,
             name: user.name,
             email: user.email,
           })
         } catch (e) {
           console.error(e)
-          return json({ error: 'User not found' }, { status: 404 })
+          return Response.json({ error: 'User not found' }, { status: 404 })
         }
       },
     },
diff --git a/examples/solid/start-basic/src/routes/api/users.ts b/examples/solid/start-basic/src/routes/api/users.ts
index 755805280b2..f2fa98359aa 100644
--- a/examples/solid/start-basic/src/routes/api/users.ts
+++ b/examples/solid/start-basic/src/routes/api/users.ts
@@ -1,5 +1,5 @@
 import { createFileRoute } from '@tanstack/solid-router'
-import { createMiddleware, json } from '@tanstack/solid-start'
+import { createMiddleware } from '@tanstack/solid-start'
 import type { User } from '~/utils/users'
 
 const userLoggerMiddleware = createMiddleware().server(
@@ -50,7 +50,7 @@ export const Route = createFileRoute('/api/users')({
         }
         const data = (await res.json()) as Array<User>
         const list = data.slice(0, 10)
-        return json(
+        return Response.json(
           list.map((u) => ({ id: u.id, name: u.name, email: u.email })),
         )
       },
diff --git a/packages/router-core/src/ssr/json.ts b/packages/router-core/src/ssr/json.ts
index 051a153f737..90226f9c8cb 100644
--- a/packages/router-core/src/ssr/json.ts
+++ b/packages/router-core/src/ssr/json.ts
@@ -1,18 +1,16 @@
-import { mergeHeaders } from './headers'
-
+/**
+ * @deprecated Use [`Response.json`](https://developer.mozilla.org/en-US/docs/Web/API/Response/json_static) from the standard Web API directly.
+ */
 export interface JsonResponse<TData> extends Response {
   json: () => Promise<TData>
 }
 
+/**
+ * @deprecated Use [`Response.json`](https://developer.mozilla.org/en-US/docs/Web/API/Response/json_static) from the standard Web API directly.
+ */
 export function json<TData>(
   payload: TData,
   init?: ResponseInit,
 ): JsonResponse<TData> {
-  return new Response(JSON.stringify(payload), {
-    ...init,
-    headers: mergeHeaders(
-      { 'content-type': 'application/json' },
-      init?.headers,
-    ),
-  })
+  return Response.json(payload, init)
 }
diff --git a/packages/router-core/tests/json.test.ts b/packages/router-core/tests/json.test.ts
deleted file mode 100644
index 8d675212f8a..00000000000
--- a/packages/router-core/tests/json.test.ts
+++ /dev/null
@@ -1,37 +0,0 @@
-import { describe, expect, it } from 'vitest'
-import { json } from '../src/ssr/json'
-
-describe('json', () => {
-  it('sets the content type to application/json and stringifies the data', async () => {
-    const data = { foo: 'bar' }
-    const response = json(data)
-
-    expect(response.headers.get('Content-Type')).toBe('application/json')
-
-    const responseClone = response.clone()
-    await expect(responseClone.text()).resolves.toEqual(JSON.stringify(data))
-
-    await expect(response.json()).resolves.toEqual(data)
-  })
-  it("doesn't override the content type if it's already set", () => {
-    const response = json(null, { headers: { 'Content-Type': 'text/plain' } })
-
-    expect(response.headers.get('Content-Type')).toBe('text/plain')
-  })
-  it('reflects passed status and statusText', () => {
-    const response = json(null, { status: 404, statusText: 'Not Found' })
-
-    expect(response.status).toBe(404)
-    expect(response.statusText).toBe('Not Found')
-  })
-  it.each<[string, HeadersInit]>([
-    ['plain object', { 'X-TYPE': 'example' }],
-    ['array', [['X-TYPE', 'example']]],
-    ['Headers', new Headers({ 'X-TYPE': 'example' })],
-  ])('merges headers from %s', (_, headers) => {
-    const response = json(null, { headers })
-
-    expect(response.headers.get('X-TYPE')).toBe('example')
-    expect(response.headers.get('Content-Type')).toBe('application/json')
-  })
-})
diff --git a/packages/start-server-core/src/createStartHandler.ts b/packages/start-server-core/src/createStartHandler.ts
index aa2da38cfe0..b0984b32751 100644
--- a/packages/start-server-core/src/createStartHandler.ts
+++ b/packages/start-server-core/src/createStartHandler.ts
@@ -1,9 +1,5 @@
 import { createMemoryHistory } from '@tanstack/history'
-import {
-  flattenMiddlewares,
-  json,
-  mergeHeaders,
-} from '@tanstack/start-client-core'
+import { flattenMiddlewares, mergeHeaders } from '@tanstack/start-client-core'
 import {
   executeRewriteInput,
   isRedirect,
@@ -178,7 +174,7 @@ export function createStartHandler<TRegister = Register>(
                   )
 
                   if (!isRouterAcceptSupported) {
-                    return json(
+                    return Response.json(
                       {
                         error: 'Only HTML requests are supported here',
                       },
@@ -259,7 +255,7 @@ export function createStartHandler<TRegister = Register>(
       if (isRedirect(response)) {
         if (isResolvedRedirect(response)) {
           if (request.headers.get('x-tsr-redirect') === 'manual') {
-            return json(
+            return Response.json(
               {
                 ...response.options,
                 isSerializedRedirect: true,
@@ -300,7 +296,7 @@ export function createStartHandler<TRegister = Register>(
         const redirect = router.resolveRedirect(response)
 
         if (request.headers.get('x-tsr-redirect') === 'manual') {
-          return json(
+          return Response.json(
             {
               ...response.options,
               isSerializedRedirect: true,
diff --git a/packages/start-server-core/tests/serverRoute.test-d.ts b/packages/start-server-core/tests/serverRoute.test-d.ts
index bc5b17db667..cd9bd671be5 100644
--- a/packages/start-server-core/tests/serverRoute.test-d.ts
+++ b/packages/start-server-core/tests/serverRoute.test-d.ts
@@ -3,7 +3,6 @@ import { test } from 'vitest'
 test('dummy', () => {})
 /*
 import { expectTypeOf, test } from 'vitest'
-import { json } from '../../router-core/src/ssr/json'
 import '../../start-client-core/src/serverRoute'
 import { createMiddleware } from '../../start-client-core/src/createMiddleware'
 import { createFileRoute as defaultCreateFileRoute } from '../../react-router/src/fileRoute'
@@ -41,7 +40,7 @@ test('createServerFileRoute with methods with no middleware', () => {
         request: Request
       }>()
 
-      return json({
+      return Response.json({
         test: 'test',
       })
     },
@@ -56,7 +55,7 @@ test('createServerFileRoute with methods with no middleware', () => {
         request: Request
       }>()
 
-      return json({
+      return Response.json({
         test: 'test',
       })
     }),
@@ -83,7 +82,7 @@ test('createServerFileRoute with methods and route middleware context', () => {
         request: Request
       }>()
 
-      return json({
+      return Response.json({
         test: 'test',
       })
     },
@@ -98,7 +97,7 @@ test('createServerFileRoute with methods and route middleware context', () => {
         request: Request
       }>()
 
-      return json({
+      return Response.json({
         test: 'test',
       })
     }),
@@ -129,7 +128,7 @@ test('createServerFileRoute with methods middleware and route middleware', () =>
         request: Request
       }>()
 
-      return json({
+      return Response.json({
         test: 'test',
       })
     }),
@@ -178,7 +177,7 @@ test('createServerFileRoute with a parent middleware context', () => {
           request: Request
         }>()
 
-        return json({ test: 'test' })
+        return Response.json({ test: 'test' })
       },
     })
 
@@ -199,7 +198,7 @@ test('createServerFileRoute with a parent middleware context', () => {
           request: Request
         }>()
 
-        return json({ test: 'test' })
+        return Response.json({ test: 'test' })
       }),
     }))
 })
@@ -232,7 +231,7 @@ test('createServerFileRoute with parent middleware params', () => {
         request: Request
       }>()
 
-      return json({ test: 'test' })
+      return Response.json({ test: 'test' })
     },
   })
 
@@ -245,7 +244,7 @@ test('createServerFileRoute with parent middleware params', () => {
         request: Request
       }>()
 
-      return json({ test: 'test' })
+      return Response.json({ test: 'test' })
     }),
   }))
 })
@@ -268,7 +267,7 @@ test('createServerFileRoute with no params', () => {
         request: Request
       }>()
 
-      return json({ test: 'test' })
+      return Response.json({ test: 'test' })
     },
   })
 
@@ -281,7 +280,7 @@ test('createServerFileRoute with no params', () => {
         request: Request
       }>()
 
-      return json({ test: 'test' })
+      return Response.json({ test: 'test' })
     }),
   }))
 })