Generate workflows from natural language using GPT-4o Mini and n8nBuilder API

by Mehmet Burak Akgün · 305 views · created 2025-12-23 · Content Creation

What this workflow does

This AI workflow has 17 nodes and runs when someone submits an n8n form (“n8n Workflow Generator”) (plus 2 other triggers). Along the way it connects HTTP Request and OpenAI Chat Model. It also calls api.n8nbuilder.dev over HTTP.

How it runs

Trigger: When someone submits an n8n form (“n8n Workflow Generator”) (plus 2 other triggers).

1. Call n8nBuilder API (HTTP Request): calls api.n8nbuilder.dev (POST)
2. n8nBuilder Chat Assistant (AI Agent): runs an AI agent, with model: GPT-4o Mini Model; 1 tool (Generate Workflow Tool)
3. Call n8nBuilder API (Webhook) (HTTP Request): calls api.n8nbuilder.dev (POST)
4. Process API Response (Edit Fields (Set)): sets 4 fields: output, timestamp, query_description…
5. Extract Generated Workflow (Edit Fields (Set)): sets 1 field: output
6. Process Webhook Response (Edit Fields (Set)): sets 3 fields: success, workflow_json, timestamp
7. Handle API Errors (If): checks a condition and branches into true / false
8. Check Webhook Response (If): checks a condition and branches into true / false
9. Show Results (n8n Form): shows the next form page
10. Show Error Message (n8n Form): shows the next form page

…plus 2 more steps. See the full node list below.

Services it uses

HTTP RequestOpenAI Chat Model

HTTP calls to: api.n8nbuilder.dev

Before you upgrade to n8n 3.0

Nodes used (11)

• HTTP Requestn8n-nodes-base.httpRequest
• Chat Trigger@n8n/n8n-nodes-langchain.chatTrigger
• AI Agent@n8n/n8n-nodes-langchain.agent
• Http Request Tooln8n-nodes-base.httpRequestTool
• OpenAI Chat Model@n8n/n8n-nodes-langchain.lmChatOpenAi
• n8n Form Triggern8n-nodes-base.formTrigger
• Edit Fields (Set)n8n-nodes-base.set
• n8n Formn8n-nodes-base.form
• Ifn8n-nodes-base.if
• Webhookn8n-nodes-base.webhook
• Respond to Webhookn8n-nodes-base.respondToWebhook

From the author

🤖 AI-Powered n8n Workflow Generator with n8nBuilder API Overview This workflow lets you generate complete n8n workflows from natural language descriptions using the n8nBuilder API. 🚀 Users submit a short description via a form, and the workflow returns a…

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