swagger-gen

Swagger Generator

Your API has no documentation. This reads your Express routes and generates a complete OpenAPI 3.0 spec.

One command. Zero config. Just works.

Quick Start

npx ai-swagger ./src/routes/

What It Does

• Reads your Express route files
• Generates OpenAPI 3.0 specification
• Documents request/response shapes
• Ready for Swagger UI

Usage Examples

# Generate from routes
npx ai-swagger ./src/routes/

# Single file
npx ai-swagger ./src/routes/users.ts -o docs/api.yaml

Best Practices

• Keep it updated - regenerate when routes change
• Add descriptions - explain what endpoints do
• Include examples - show sample requests
• Document errors - not just happy paths

When to Use This

• Creating API documentation
• Setting up Swagger UI
• Onboarding API consumers
• API-first design

Part of the LXGIC Dev Toolkit

This is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work.

Find more:

• GitHub: https://github.com/LXGIC-Studios
• Twitter: https://x.com/lxgicstudios
• Substack: https://lxgicstudios.substack.com
• Website: https://lxgic.dev

Requirements

No install needed. Just run with npx. Node.js 18+ recommended. Needs OPENAI_API_KEY environment variable.

npx ai-swagger --help

How It Works

Parses your Express route definitions to extract endpoints, methods, and handler code. Then generates OpenAPI spec with proper types and descriptions.

License

MIT. Free forever. Use it however you want.