Cannot create `ChatGoogle` LLM with `GOOGLE_APPLICATION_CREDENTIALS`

Author: wbyoungCreated Sep 17, 2026Updated Sep 17, 2026

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This is a bug, not a usage question. For questions, please use the LangChain Forum (https://forum.langchain.com/).
I added a very descriptive title to this issue.
I searched the LangChain.js documentation with the integrated search.
I used the GitHub search to find a similar question and didn't find it.
I am sure that this is a bug in LangChain.js rather than my code.
The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

Before running, export GOOGLE_APPLICATION_CREDENTIALS in your shell environment, pointing to a file containing the application credentials. This example is roughly the same as the docs.

typescript

import { ChatGoogle } from '@langchain/google'

const model = new ChatGoogle('gemini-3.7-flash', {
  platformType: 'gcp',
  maxOutputTokens: 2048,
  location: 'global',
  vertexai: true,
})

const result = await model.invoke([
  new SystemMessage(
    'You are a helpful assistant that translates English to French. Translate the user sentence.',
  ),
  new HumanMessage('I love programming.'),
])

Error Message and Stack Trace (if applicable)

err: {
  "type": "AuthError",
  "message": "No authentication method available. Please provide either an apiKey or credentials.",
  "stack":
      AuthError: No authentication method available. Please provide either an apiKey or credentials.
          at WebApiClient.fetch (file:///usr/src/app/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected][email protected]_/node_modules/@langchain/google/dist/clients/index.js:207:48)
          at file:///usr/src/app/node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected][email protected]_/node_modules/@langchain/google/dist/chat_models/base.js:298:47
          at pRetry.onFailedAttempt.error.error (file:///usr/src/app/node_modules/.pnpm/@[email protected]_@[email protected][email protected]/node_modules/@langchain/core/dist/utils/async_caller.js:191:44)
          at pRetry (file:///usr/src/app/node_modules/.pnpm/@[email protected]_@[email protected][email protected]/node_modules/@langchain/core/dist/utils/p-retry/index.js:124:25)
          at queue.add.throwOnTimeout (file:///usr/src/app/node_modules/.pnpm/@[email protected]_@[email protected][email protected]/node_modules/@langchain/core/dist/utils/async_caller.js:191:31)
          at run (/usr/src/app/node_modules/.pnpm/[email protected]/node_modules/p-queue/dist/index.js:157:104)
          at PQueue._tryToStartAnother (/usr/src/app/node_modules/.pnpm/[email protected]/node_modules/p-queue/dist/index.js:105:17)
          at /usr/src/app/node_modules/.pnpm/[email protected]/node_modules/p-queue/dist/index.js:171:18
          at new Promise (<anonymous>)
          at PQueue.add (/usr/src/app/node_modules/.pnpm/[email protected]/node_modules/p-queue/dist/index.js:152:16)
  "name": "AuthError"
}

Description

I'm trying to use this for a new app and not start with the deprecated ChatVertexAI from @langchain/google-vertexai, but I can't seem to get it to work with GOOGLE_APPLICATION_CREDENTIALS.

System Info

/usr/src/app # cat package.json | grep langchain
    "@langchain/core": "^1.2.11",
    "@langchain/google": "^0.2.6",
    "@langchain/google-vertexai": "^2.3.2",
    "@langchain/pgvector": "^0.1.0",
    "@langchain/textsplitters": "^1.0.1",
/usr/src/app # cat package.json | grep langchain
    "@langchain/core": "^1.2.11",
    "@langchain/google": "^0.2.6",
    "@langchain/google-vertexai": "^2.3.2",
    "@langchain/pgvector": "^0.1.0",
    "@langchain/textsplitters": "^1.0.1",
/usr/src/app # cat /etc/alpine-release 
3.23.3
/usr/src/app # node --version
v24.13.0
/usr/src/app # pnpm --version
10.30.0
/usr/src/app #

Source: langchain-ai/langchainjs

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