diff --git a/modelerfour/modeler/modelerfour.ts b/modelerfour/modeler/modelerfour.ts
index 6809bc6..b7e939f 100644
--- a/modelerfour/modeler/modelerfour.ts
+++ b/modelerfour/modeler/modelerfour.ts
@@ -780,7 +780,7 @@ export class ModelerFour {
       return this.processChoiceSchema(name, schema);
     }
 
-    if (<any>schema.type === 'file' || <any>schema.format === 'file' || <any>schema.format === 'binary') {
+    if (this.isSchemaBinary(schema)) {
       // handle inconsistency in file format handling.
       this.session.hint(
         `'The schema ${schema?.['x-ms-metadata']?.name || name} with 'type: ${schema.type}', format: ${schema.format}' will be treated as a binary blob for binary media types.`,
@@ -1760,7 +1760,9 @@ export class ModelerFour {
             throw new Error(`Operation '${operationGroup.language.default.name}/${operation.language.default.name}' must have a media type.`);
           }
       }
+
       const kmtBinary = groupedMediaTypes.get(KnownMediaType.Binary);
+      
       if (kmtBinary) {
         // handle binary
         this.processBinary(KnownMediaType.Binary, kmtBinary, operation, requestBody);
@@ -1771,7 +1773,21 @@ export class ModelerFour {
       }
       const kmtJSON = groupedMediaTypes.get(KnownMediaType.Json);
       if (kmtJSON) {
-        this.processSerializedObject(KnownMediaType.Json, kmtJSON, operation, requestBody);
+        if ([...kmtJSON.values()].find((x) => x.schema.instance && this.isSchemaBinary(x.schema.instance))) {
+          this.processBinary(
+            KnownMediaType.Binary,
+            kmtJSON,
+            operation,
+            requestBody
+          );
+        } else {
+          this.processSerializedObject(
+            KnownMediaType.Json,
+            kmtJSON,
+            operation,
+            requestBody
+          );
+        }
       }
       const kmtXML = groupedMediaTypes.get(KnownMediaType.Xml);
       if (kmtXML && !kmtJSON) {
@@ -1882,6 +1898,14 @@ export class ModelerFour {
     return this.codeModel;
   }
 
+  private isSchemaBinary(schema: OpenAPI.Schema) {
+    return (
+      <any>schema.type === "file" ||
+      <any>schema.format === "file" ||
+      <any>schema.format === "binary"
+    );
+  }
+
   private propagateSchemaUsage(schema: Schema): void {
     const processedSchemas = new Set<Schema>();
 
diff --git a/modelerfour/test/scenarios/body-binary-json/flattened.yaml b/modelerfour/test/scenarios/body-binary-json/flattened.yaml
new file mode 100644
index 0000000..39956de
--- /dev/null
+++ b/modelerfour/test/scenarios/body-binary-json/flattened.yaml
@@ -0,0 +1,110 @@
+!<!CodeModel> 
+info: !<!Info> 
+  description: Acceptance test for file with json content type.
+  title: 'Binary with content-type: application/json'
+schemas: !<!Schemas> 
+  strings:
+    - !<!StringSchema> &ref_0
+      type: string
+      language: !<!Languages> 
+        default:
+          name: string
+          description: simple string
+      protocol: !<!Protocols> {}
+  binaries:
+    - !<!BinarySchema> &ref_2
+      type: binary
+      apiVersions:
+        - !<!ApiVersion> 
+          version: 1.0.0
+      language: !<!Languages> 
+        default:
+          name: binary
+          description: ''
+      protocol: !<!Protocols> {}
+globalParameters:
+  - !<!Parameter> &ref_1
+    schema: *ref_0
+    clientDefaultValue: 'https://localhost'
+    implementation: Client
+    origin: 'modelerfour:synthesized/host'
+    required: true
+    extensions:
+      x-ms-skip-url-encoding: true
+    language: !<!Languages> 
+      default:
+        name: $host
+        description: server parameter
+        serializedName: $host
+    protocol: !<!Protocols> 
+      http: !<!HttpParameter> 
+        in: uri
+operationGroups:
+  - !<!OperationGroup> 
+    $key: Upload
+    operations:
+      - !<!Operation> 
+        apiVersions:
+          - !<!ApiVersion> 
+            version: 1.0.0
+        parameters:
+          - *ref_1
+        requests:
+          - !<!Request> 
+            parameters:
+              - !<!Parameter> &ref_3
+                schema: *ref_2
+                implementation: Method
+                required: true
+                language: !<!Languages> 
+                  default:
+                    name: fileParam
+                    description: Foo bar
+                protocol: !<!Protocols> 
+                  http: !<!HttpParameter> 
+                    in: body
+                    style: binary
+            signatureParameters:
+              - *ref_3
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpBinaryRequest> 
+                path: /file
+                method: post
+                binary: true
+                knownMediaType: binary
+                mediaTypes:
+                  - application/json
+                uri: '{$host}'
+        signatureParameters: []
+        responses:
+          - !<!Response> 
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpResponse> 
+                statusCodes:
+                  - '200'
+        language: !<!Languages> 
+          default:
+            name: File
+            description: Uploading json file
+        protocol: !<!Protocols> {}
+    language: !<!Languages> 
+      default:
+        name: Upload
+        description: ''
+    protocol: !<!Protocols> {}
+security: !<!Security> 
+  authenticationRequired: false
+language: !<!Languages> 
+  default:
+    name: ''
+    description: ''
+protocol: !<!Protocols> 
+  http: !<!HttpModel> {}
diff --git a/modelerfour/test/scenarios/body-binary-json/grouped.yaml b/modelerfour/test/scenarios/body-binary-json/grouped.yaml
new file mode 100644
index 0000000..39956de
--- /dev/null
+++ b/modelerfour/test/scenarios/body-binary-json/grouped.yaml
@@ -0,0 +1,110 @@
+!<!CodeModel> 
+info: !<!Info> 
+  description: Acceptance test for file with json content type.
+  title: 'Binary with content-type: application/json'
+schemas: !<!Schemas> 
+  strings:
+    - !<!StringSchema> &ref_0
+      type: string
+      language: !<!Languages> 
+        default:
+          name: string
+          description: simple string
+      protocol: !<!Protocols> {}
+  binaries:
+    - !<!BinarySchema> &ref_2
+      type: binary
+      apiVersions:
+        - !<!ApiVersion> 
+          version: 1.0.0
+      language: !<!Languages> 
+        default:
+          name: binary
+          description: ''
+      protocol: !<!Protocols> {}
+globalParameters:
+  - !<!Parameter> &ref_1
+    schema: *ref_0
+    clientDefaultValue: 'https://localhost'
+    implementation: Client
+    origin: 'modelerfour:synthesized/host'
+    required: true
+    extensions:
+      x-ms-skip-url-encoding: true
+    language: !<!Languages> 
+      default:
+        name: $host
+        description: server parameter
+        serializedName: $host
+    protocol: !<!Protocols> 
+      http: !<!HttpParameter> 
+        in: uri
+operationGroups:
+  - !<!OperationGroup> 
+    $key: Upload
+    operations:
+      - !<!Operation> 
+        apiVersions:
+          - !<!ApiVersion> 
+            version: 1.0.0
+        parameters:
+          - *ref_1
+        requests:
+          - !<!Request> 
+            parameters:
+              - !<!Parameter> &ref_3
+                schema: *ref_2
+                implementation: Method
+                required: true
+                language: !<!Languages> 
+                  default:
+                    name: fileParam
+                    description: Foo bar
+                protocol: !<!Protocols> 
+                  http: !<!HttpParameter> 
+                    in: body
+                    style: binary
+            signatureParameters:
+              - *ref_3
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpBinaryRequest> 
+                path: /file
+                method: post
+                binary: true
+                knownMediaType: binary
+                mediaTypes:
+                  - application/json
+                uri: '{$host}'
+        signatureParameters: []
+        responses:
+          - !<!Response> 
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpResponse> 
+                statusCodes:
+                  - '200'
+        language: !<!Languages> 
+          default:
+            name: File
+            description: Uploading json file
+        protocol: !<!Protocols> {}
+    language: !<!Languages> 
+      default:
+        name: Upload
+        description: ''
+    protocol: !<!Protocols> {}
+security: !<!Security> 
+  authenticationRequired: false
+language: !<!Languages> 
+  default:
+    name: ''
+    description: ''
+protocol: !<!Protocols> 
+  http: !<!HttpModel> {}
diff --git a/modelerfour/test/scenarios/body-binary-json/modeler.yaml b/modelerfour/test/scenarios/body-binary-json/modeler.yaml
new file mode 100644
index 0000000..0ab3b4c
--- /dev/null
+++ b/modelerfour/test/scenarios/body-binary-json/modeler.yaml
@@ -0,0 +1,110 @@
+!<!CodeModel> 
+info: !<!Info> 
+  description: Acceptance test for file with json content type.
+  title: 'Binary with content-type: application/json'
+schemas: !<!Schemas> 
+  strings:
+    - !<!StringSchema> &ref_0
+      type: string
+      language: !<!Languages> 
+        default:
+          name: string
+          description: simple string
+      protocol: !<!Protocols> {}
+  binaries:
+    - !<!BinarySchema> &ref_1
+      type: binary
+      apiVersions:
+        - !<!ApiVersion> 
+          version: 1.0.0
+      language: !<!Languages> 
+        default:
+          name: binary
+          description: ''
+      protocol: !<!Protocols> {}
+globalParameters:
+  - !<!Parameter> &ref_3
+    schema: *ref_0
+    clientDefaultValue: 'https://localhost'
+    implementation: Client
+    origin: 'modelerfour:synthesized/host'
+    required: true
+    extensions:
+      x-ms-skip-url-encoding: true
+    language: !<!Languages> 
+      default:
+        name: $host
+        description: server parameter
+        serializedName: $host
+    protocol: !<!Protocols> 
+      http: !<!HttpParameter> 
+        in: uri
+operationGroups:
+  - !<!OperationGroup> 
+    $key: Upload
+    operations:
+      - !<!Operation> 
+        apiVersions:
+          - !<!ApiVersion> 
+            version: 1.0.0
+        parameters:
+          - *ref_3
+        requests:
+          - !<!Request> 
+            parameters:
+              - !<!Parameter> &ref_2
+                schema: *ref_1
+                implementation: Method
+                required: true
+                language: !<!Languages> 
+                  default:
+                    name: fileParam
+                    description: Foo bar
+                protocol: !<!Protocols> 
+                  http: !<!HttpParameter> 
+                    in: body
+                    style: binary
+            signatureParameters:
+              - *ref_2
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpBinaryRequest> 
+                path: /file
+                method: post
+                binary: true
+                knownMediaType: binary
+                mediaTypes:
+                  - application/json
+                uri: '{$host}'
+        signatureParameters: []
+        responses:
+          - !<!Response> 
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpResponse> 
+                statusCodes:
+                  - '200'
+        language: !<!Languages> 
+          default:
+            name: File
+            description: Uploading json file
+        protocol: !<!Protocols> {}
+    language: !<!Languages> 
+      default:
+        name: Upload
+        description: ''
+    protocol: !<!Protocols> {}
+security: !<!Security> 
+  authenticationRequired: false
+language: !<!Languages> 
+  default:
+    name: ''
+    description: ''
+protocol: !<!Protocols> 
+  http: !<!HttpModel> {}
diff --git a/modelerfour/test/scenarios/body-binary-json/namer.yaml b/modelerfour/test/scenarios/body-binary-json/namer.yaml
new file mode 100644
index 0000000..8d3e296
--- /dev/null
+++ b/modelerfour/test/scenarios/body-binary-json/namer.yaml
@@ -0,0 +1,110 @@
+!<!CodeModel> 
+info: !<!Info> 
+  description: Acceptance test for file with json content type.
+  title: 'Binary with content-type: application/json'
+schemas: !<!Schemas> 
+  strings:
+    - !<!StringSchema> &ref_0
+      type: string
+      language: !<!Languages> 
+        default:
+          name: String
+          description: simple string
+      protocol: !<!Protocols> {}
+  binaries:
+    - !<!BinarySchema> &ref_2
+      type: binary
+      apiVersions:
+        - !<!ApiVersion> 
+          version: 1.0.0
+      language: !<!Languages> 
+        default:
+          name: binary
+          description: ''
+      protocol: !<!Protocols> {}
+globalParameters:
+  - !<!Parameter> &ref_1
+    schema: *ref_0
+    clientDefaultValue: 'https://localhost'
+    implementation: Client
+    origin: 'modelerfour:synthesized/host'
+    required: true
+    extensions:
+      x-ms-skip-url-encoding: true
+    language: !<!Languages> 
+      default:
+        name: $host
+        description: server parameter
+        serializedName: $host
+    protocol: !<!Protocols> 
+      http: !<!HttpParameter> 
+        in: uri
+operationGroups:
+  - !<!OperationGroup> 
+    $key: Upload
+    operations:
+      - !<!Operation> 
+        apiVersions:
+          - !<!ApiVersion> 
+            version: 1.0.0
+        parameters:
+          - *ref_1
+        requests:
+          - !<!Request> 
+            parameters:
+              - !<!Parameter> &ref_3
+                schema: *ref_2
+                implementation: Method
+                required: true
+                language: !<!Languages> 
+                  default:
+                    name: fileParam
+                    description: Foo bar
+                protocol: !<!Protocols> 
+                  http: !<!HttpParameter> 
+                    in: body
+                    style: binary
+            signatureParameters:
+              - *ref_3
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpBinaryRequest> 
+                path: /file
+                method: post
+                binary: true
+                knownMediaType: binary
+                mediaTypes:
+                  - application/json
+                uri: '{$host}'
+        signatureParameters: []
+        responses:
+          - !<!Response> 
+            language: !<!Languages> 
+              default:
+                name: ''
+                description: ''
+            protocol: !<!Protocols> 
+              http: !<!HttpResponse> 
+                statusCodes:
+                  - '200'
+        language: !<!Languages> 
+          default:
+            name: File
+            description: Uploading json file
+        protocol: !<!Protocols> {}
+    language: !<!Languages> 
+      default:
+        name: Upload
+        description: ''
+    protocol: !<!Protocols> {}
+security: !<!Security> 
+  authenticationRequired: false
+language: !<!Languages> 
+  default:
+    name: BinaryWithContentTypeApplicationJson
+    description: ''
+protocol: !<!Protocols> 
+  http: !<!HttpModel> {}
diff --git a/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json b/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json
new file mode 100644
index 0000000..810902f
--- /dev/null
+++ b/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json
@@ -0,0 +1,37 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "description": "Sample for file with json content type.",
+    "version": "1.0.0",
+    "title": "Binary with content-type: application/json"
+  },
+  "host": "localhost",
+  "schemes": ["https"],
+  "consumes": ["application/json"],
+  "produces": ["application/json"],
+  "paths": {
+    "/file": {
+      "post": {
+        "description": "Uploading json file",
+        "operationId": "Upload_File",
+        "parameters": [
+          {
+            "name": "fileParam",
+            "in": "body",
+            "schema": {
+              "type": "object",
+              "format": "file"
+            },
+            "required": true,
+            "description": "Foo bar"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Cowbell was added."
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/modelerfour/test/scenarios/body-binary-json/openapi-document.json b/modelerfour/test/scenarios/body-binary-json/openapi-document.json
new file mode 100644
index 0000000..924344d
--- /dev/null
+++ b/modelerfour/test/scenarios/body-binary-json/openapi-document.json
@@ -0,0 +1,134 @@
+{
+ "openapi": "3.0.0",
+ "info": {
+  "x-ms-metadata": {
+   "merged": true,
+   "apiVersions": [
+    "1.0.0"
+   ],
+   "deduplicated": true,
+   "schemaReduced": true
+  },
+  "title": "Binary with content-type: application/json",
+  "description": "Acceptance test for file with json content type.",
+  "version": "1.0.0"
+ },
+ "paths": {
+  "path:0": {
+   "x-ms-metadata": {
+    "apiVersions": [
+     "1.0.0"
+    ],
+    "filename": [
+     "mem:///100?oai3.shaken.json"
+    ],
+    "path": "/file",
+    "originalLocations": [
+     "file:///C:/dev/azsdk/autorest.megarepo/modelerfour/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json#/paths/~1file"
+    ]
+   }
+  },
+  "path:0.post": {
+   "x-ms-metadata": {
+    "apiVersions": [
+     "1.0.0"
+    ],
+    "filename": [
+     "mem:///100?oai3.shaken.json"
+    ],
+    "path": "/file",
+    "originalLocations": [
+     "file:///C:/dev/azsdk/autorest.megarepo/modelerfour/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json#/paths/~1file"
+    ]
+   },
+   "post": {
+    "servers": [
+     {
+      "url": "https://localhost/"
+     }
+    ],
+    "description": "Uploading json file",
+    "operationId": "Upload_File",
+    "requestBody": {
+     "description": "Foo bar",
+     "$ref": "#/components/requestBodies/requestBodies:0"
+    },
+    "x-ms-requestBody-index": 0,
+    "responses": {
+     "200": {
+      "description": "Cowbell was added.",
+      "$ref": "#/components/responses/responses:0"
+     }
+    }
+   }
+  }
+ },
+ "components": {
+  "requestBodies": {
+   "requestBodies:0": {
+    "x-ms-metadata": {
+     "apiVersions": [
+      "1.0.0"
+     ],
+     "filename": [
+      "mem:///100?oai3.shaken.json"
+     ],
+     "name": "paths·c88lwi·file·post·requestbody",
+     "originalLocations": [
+      "file:///C:/dev/azsdk/autorest.megarepo/modelerfour/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json#/components/requestBodies/paths·c88lwi·file·post·requestbody"
+     ]
+    },
+    "content": {
+     "application/json": {
+      "schema": {
+       "$ref": "#/components/schemas/schemas:0"
+      }
+     }
+    },
+    "required": true,
+    "description": "Foo bar",
+    "x-ms-requestBody-name": "fileParam"
+   }
+  },
+  "schemas": {
+   "schemas:0": {
+    "x-ms-metadata": {
+     "apiVersions": [
+      "1.0.0"
+     ],
+     "filename": [
+      "mem:///100?oai3.shaken.json"
+     ],
+     "name": "paths·rjabaz·file·post·requestbody·content·application-json·schema",
+     "originalLocations": [
+      "file:///C:/dev/azsdk/autorest.megarepo/modelerfour/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json#/components/schemas/paths·rjabaz·file·post·requestbody·content·application-json·schema"
+     ]
+    },
+    "type": "object",
+    "format": "file"
+   }
+  },
+  "responses": {
+   "responses:0": {
+    "x-ms-metadata": {
+     "apiVersions": [
+      "1.0.0"
+     ],
+     "filename": [
+      "mem:///100?oai3.shaken.json"
+     ],
+     "name": "paths·2jxz45·file·post·responses·200",
+     "originalLocations": [
+      "file:///C:/dev/azsdk/autorest.megarepo/modelerfour/modelerfour/test/scenarios/body-binary-json/oai2.loaded.json#/components/responses/paths·2jxz45·file·post·responses·200"
+     ]
+    },
+    "description": "Cowbell was added."
+   }
+  }
+ },
+ "servers": [
+  {
+   "url": "https://localhost/"
+  }
+ ]
+}
\ No newline at end of file