diff --git a/js/package.json b/js/package.json
index ff122d886..eec53685e 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "langsmith",
-  "version": "0.1.56",
+  "version": "0.1.57",
   "description": "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform.",
   "packageManager": "yarn@1.22.19",
   "files": [
diff --git a/js/src/index.ts b/js/src/index.ts
index da838f6bc..42fa4669f 100644
--- a/js/src/index.ts
+++ b/js/src/index.ts
@@ -14,4 +14,4 @@ export { RunTree, type RunTreeConfig } from "./run_trees.js";
 export { overrideFetchImplementation } from "./singletons/fetch.js";
 
 // Update using yarn bump-version
-export const __version__ = "0.1.56";
+export const __version__ = "0.1.57";
diff --git a/js/src/run_trees.ts b/js/src/run_trees.ts
index a2dad8bcb..64cc7fb2b 100644
--- a/js/src/run_trees.ts
+++ b/js/src/run_trees.ts
@@ -146,6 +146,8 @@ class Baggage {
 }
 
 export class RunTree implements BaseRun {
+  private static sharedClient: Client | null = null;
+
   id: string;
   name: RunTreeConfig["name"];
   run_type: string;
@@ -173,7 +175,7 @@ export class RunTree implements BaseRun {
   constructor(originalConfig: RunTreeConfig) {
     const defaultConfig = RunTree.getDefaultConfig();
     const { metadata, ...config } = originalConfig;
-    const client = config.client ?? new Client();
+    const client = config.client ?? RunTree.getSharedClient();
     const dedupedMetadata = {
       ...metadata,
       ...config?.extra?.metadata,
@@ -226,6 +228,13 @@ export class RunTree implements BaseRun {
     };
   }
 
+  private static getSharedClient(): Client {
+    if (!RunTree.sharedClient) {
+      RunTree.sharedClient = new Client();
+    }
+    return RunTree.sharedClient;
+  }
+
   public createChild(config: RunTreeConfig): RunTree {
     const child_execution_order = this.child_execution_order + 1;
 
diff --git a/js/src/tests/run_trees.int.test.ts b/js/src/tests/run_trees.int.test.ts
index 79efba3fa..ecd40976f 100644
--- a/js/src/tests/run_trees.int.test.ts
+++ b/js/src/tests/run_trees.int.test.ts
@@ -1,4 +1,5 @@
 import { Client } from "../client.js";
+import * as uuid from "uuid";
 import {
   RunTree,
   RunTreeConfig,
@@ -14,14 +15,8 @@ import {
 test.concurrent(
   "Test post and patch run",
   async () => {
-    const projectName = `__test_run_tree`;
+    const projectName = `__test_run_tree_js ${uuid.v4()}`;
     const langchainClient = new Client({ timeout_ms: 30000 });
-    try {
-      await langchainClient.readProject({ projectName });
-      await langchainClient.deleteProject({ projectName });
-    } catch (e) {
-      // Pass
-    }
     const parentRunConfig: RunTreeConfig = {
       name: "parent_run",
       run_type: "chain",
@@ -113,6 +108,20 @@ test.concurrent(
       runMap.get("parent_run")?.id
     );
     expect(runMap.get("parent_run")?.parent_run_id).toBeNull();
+    await waitUntil(
+      async () => {
+        try {
+          const runs_ = await toArray(
+            langchainClient.listRuns({ traceId: runs[0].trace_id })
+          );
+          return runs_.length === 5;
+        } catch (e) {
+          return false;
+        }
+      },
+      30_000, // Wait up to 30 seconds
+      3000 // every 3 second
+    );
 
     const traceRunsIter = langchainClient.listRuns({
       traceId: runs[0].trace_id,
diff --git a/js/src/tests/run_trees.test.ts b/js/src/tests/run_trees.test.ts
index 70e2c79d9..253c32f45 100644
--- a/js/src/tests/run_trees.test.ts
+++ b/js/src/tests/run_trees.test.ts
@@ -112,3 +112,12 @@ test("distributed", () => {
       "20210503T000000000001Z00000000-0000-0000-0000-00000000000.20210503T000001000002Z00000000-0000-0000-0000-00000000001",
   });
 });
+
+test("shared client between run trees", () => {
+  const runTree1 = new RunTree({ name: "tree_1" });
+  const runTree2 = new RunTree({ name: "tree_2" });
+
+  expect(runTree1.client).toBeDefined();
+  expect(runTree2.client).toBeDefined();
+  expect(runTree1.client).toBe(runTree2.client);
+});