Developer Docs

Build with QR Gen

Free QR code API. No auth, no signup. Generate QR codes from any language, framework, or AI agent.

API Reference GET/POST endpoints, parameters, response formats, code examples in JS, Python, curl, and Go. LLM Integration Function calling schemas, MCP server setup, system prompts for giving AI agents QR capabilities. Claude Code Bash tool usage, MCP server config, and example conversation flows for Anthropic's CLI. OpenAI Codex Custom GPT actions, Assistants API, Responses API, and function calling examples. Python Generate QR codes with the requests library. GET, POST, batch generation, Flask integration. Node.js Native fetch, zero dependencies. Express middleware, TypeScript types, batch generation. n8n HTTP Request node integration. Generate QR codes in automated workflows without code. Zapier Webhooks by Zapier integration. Direct image URLs or custom webhook requests.

Quick Start

curl "https://qrgenapp.com/api/qr?data=hello&format=png" -o qr.png

That's it. No API key, no signup. Returns a PNG image directly.