# LangGraph Deployment Error: Module Not Found

**URL:** <https://forum.langchain.com/t/langgraph-deployment-error-module-not-found/2419>\
**Category:** Deployment\
**Tags:** cloud, js-help\
**Created:** [December 4, 2025, 6:19pm UTC](https://forum.langchain.com/t/langgraph-deployment-error-module-not-found/2419 "2025-12-04T18:19:38Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![shawon-majid](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/shawon-majid/32/1640_2.png) [@shawon-majid](https://forum.langchain.com/u/shawon-majid)\
**Post date:** [December 4, 2025, 6:19pm UTC](https://forum.langchain.com/t/langgraph-deployment-error-module-not-found/2419/1 "2025-12-04T18:19:38Z")

</div>

I am getting this error, while deploying project to langgraph.

```auto
05/12/2025, 00:10:20

[ERROR] Node.js v20.19.6

05/12/2025, 00:10:20

[ERROR] }

05/12/2025, 00:10:20

[ERROR] code: 'ERR_MODULE_NOT_FOUND'

05/12/2025, 00:10:20

[ERROR] at async resolve (file:///api/langgraph_api/js/src/load.hooks.mjs:53:22) {

05/12/2025, 00:10:20

[ERROR] at async nextResolve (node:internal/modules/esm/hooks:864:22)

05/12/2025, 00:10:20

[ERROR] at async resolve (file:///usr/lib/node_modules/tsx/dist/esm/index.mjs?1764871820470:2:5355)

05/12/2025, 00:10:20

[ERROR] at resolveTsPaths (file:///usr/lib/node_modules/tsx/dist/esm/index.mjs?1764871820470:2:4984)

05/12/2025, 00:10:20

[ERROR] at resolveDirectory (file:///usr/lib/node_modules/tsx/dist/esm/index.mjs?1764871820470:2:4243)

05/12/2025, 00:10:20

[ERROR] at resolveBase (file:///usr/lib/node_modules/tsx/dist/esm/index.mjs?1764871820470:2:3744)

05/12/2025, 00:10:20

[ERROR] at nextResolve (node:internal/modules/esm/hooks:864:28)

05/12/2025, 00:10:20

[ERROR] at defaultResolve (node:internal/modules/esm/resolve:1188:11)

05/12/2025, 00:10:20

[ERROR] at moduleResolve (node:internal/modules/esm/resolve:946:18)

05/12/2025, 00:10:20

[ERROR] at packageResolve (node:internal/modules/esm/resolve:873:9)

05/12/2025, 00:10:20

[ERROR] Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@langchain/langgraph' imported from /deps/indigo-nx/apps/assistant-chat/src/assistant/graph.ts

```

My langgraph.json

```auto
{

    "node_version": "20",

"dockerfile_lines": [],

"dependencies": [

"."

    ],

"graphs": {

"assistant": "./src/assistant/graph.ts:assistant"

    },

"env": ".env"

}

```

and my package.json is the following:

```auto
{

  "name": "assistant-chat",

"version": "1.0.0",

"description": "",

"main": "index.js",

"scripts": {

"test": "echo \"Error: no test specified\" && exit 1",

"dev": "pnpm dlx @langchain/langgraph-cli dev"

  },

"keywords": [],

"author": "",

"license": "ISC",

"packageManager": "pnpm@10.19.0",

"dependencies": {

"@langchain/anthropic": "^1.1.3",

"@langchain/core": "^1.1.1",

"@langchain/google-genai": "^2.0.1",

"@langchain/google-vertexai": "^2.0.1",

"@langchain/langgraph": "^1.0.2",

"@langchain/openai": "^1.1.3",

"@langchain/xai": "^1.0.2",

"langchain": "1.1.2",

"mongodb": "^7.0.0",

"zod": "4.1.0"

  }

}

```

How to resolve this?

it works locally with this command:  
`pnpm dlx @langchain/langgraph-cli dev`

but it’s not getting deployed

---

<div class="post-metadata">

**Author:** ![hsm207](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.langchain.com/hsm207/32/1903_2.png) [@hsm207](https://forum.langchain.com/u/hsm207)\
**Post date:** [December 12, 2025, 9:11pm UTC](https://forum.langchain.com/t/langgraph-deployment-error-module-not-found/2419/2 "2025-12-12T21:11:47Z")

</div>

Is your project a monorepo?

- If YES, you need to follow a specific setup. See: [monorepo support](https://docs.langchain.com/langsmith/monorepo-support)

- If NO, try explicitly adding the missing package to your langgraph.json:

```json
   1 "dependencies": [
   2 ".",
   3 "@langchain/langgraph"
   4 ]

```