OpenAI node is not parsing or reading any input value

Questions
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1

I am passing small JSON with few strings thru HttpRequest and OpenAI is connected to my account thru a Key but can’t read any incoming messages when I use a “Message to Model”

This is the error I am getting

TypeError: Cannot read properties of undefined (reading ‘error’) at ExecuteContext.router (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/@n8n+n8n-nodes-langchain@file+packages+@n8n+nodes-langchain_7e9d43189da28db518476f7779d5ed6f/node_modules/@n8n/n8n-nodes-langchain/nodes/vendors/OpenAi/actions/router.ts:65:64) at processTicksAndRejections (node:internal/process/task_queues:105:5) at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/@n8n+n8n-nodes-langchain@file+packages+@n8n+nodes-langchain_7e9d43189da28db518476f7779d5ed6f/node_modules/@n8n/n8n-nodes-langchain/nodes/vendors/OpenAi/OpenAi.node.ts:16:10) at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1212:9) at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1582:27 at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:2153:11

1 Like
2

Hey @Varun_Ramanujam hope all is well, welcome to the community.

Could you include a minimal reproducible example of your workflow? Please don’t just paste it, use the code tags.

3

{
“nodes”: [
{
“parameters”: {
“url”: “https://newsapi.org/v2/everything”,
“sendQuery”: true,
“queryParameters”: {
“parameters”: [
{
“name”: “q”,
“value”: “={{ $json.message.text }}”
},
{
“name”: “from”,
“value”: “={{ $today.minus({days:1}).toFormat(‘yyyy-MM-dd’) }}”
},
{
“name”: “apiKey”,
“value”: “db99ddaf117645c892d5f4848948cb72”
}
]
},
“options”: {}
},
“type”: “n8n-nodes-base.httpRequest”,
“typeVersion”: 4.2,
“position”: [
-176,
480
],
“id”: “b1c36734-f6a7-4979-8105-98ef0de55427”,
“name”: “HTTP Request”
},
{
“parameters”: {
“modelId”: {
“__rl”: true,
“value”: “gpt-4.1-mini”,
“mode”: “list”,
“cachedResultName”: “GPT-4.1-MINI”
},
“messages”: {
“values”: [
{
“content”: “=You are a highly intelligent and accurate sentiment analyzer specializing in the financial markets. Analyze the sentiment of the provided text\n\n- Evaluate the immediate market reaction, recent news impact, and technical volatility\n- Determin a sentiment category: "Positive", "Neutral", "Negative"\n- Calculate a numerical score between -1 (extremely negative) and 1 (extremely positive)\n- Provide a concise rationale explaining the short-term sentiment (give a detailed response with appropriate headlines for major events.\n\nYour output must be exactly a JSON object. The value must be an object with three keys: "category", "score", and "rationale". Do not output any additional text.\n\nFor example, your output should look like:\n\n{\n\t"shortTermSentiment": {\n\t\t"category": "Positive",\n\t\t"score": "0.7,\n\t\t"rationale": "…"\n\t\t\nNow, analyze the following text and produce your JSON output:\n\n\t {{ JSON.stringify($json.articles[0]) }}”,
“role”: “system”
}
]
},
“options”: {}
},
“type”: “@n8n/n8n-nodes-langchain.openAi”,
“typeVersion”: 1.8,
“position”: [
32,
480
],
“id”: “b73c057b-c8aa-476a-9fe9-4317cd617bb1”,
“name”: “Message a model”,
“credentials”: {
“openAiApi”: {
“id”: “eMhfjilrBpsiJjpv”,
“name”: “OpenAi account 2”
}
}
}
],
“connections”: {
“HTTP Request”: {
“main”: [
[
{
“node”: “Message a model”,
“type”: “main”,
“index”: 0
}
]
]
}
},
“pinData”: {},
“meta”: {
“templateCredsSetupCompleted”: true,
“instanceId”: “f38c2a4e406bcd1e59d40800709341507ede59b247b990988555c37bd912bf9d”
}
}

4

Try to copy this workflow, run and see if this works for you

5

Nope…still the same error. Not sure if OpenAI node has some bug or something.

6

Is your OpenAI Platform in free plan?

7

No, I am paying $20/month for it

8

Hi @Varun_Ramanujam

It looks like the error property is undefined, which probably means the response from OpenAI didn’t come through as expected — possibly due to a malformed request or missing required fields.

If you’re sending a small JSON via HTTP Request, double-check that:

  • The Content-Type is set to application/json
  • Your payload matches OpenAI’s expected format (especially for messages, model, etc.)
  • Your API key is valid and has the correct scopes

Also, try logging the full response before it hits the Message to Model node — that might help pinpoint what’s missing.

Best

1 Like
9

Figured out the problem. I have recharged OpenAI with additional tokens and it is working fine now.

1 Like