API Engineering & Docs

Automated OpenAPI & Developer Docs with AI API Doc Generator

Transform messy route controllers and handler functions into clean, interactive OpenAPI 3.1 specifications, Swagger references, and readable Markdown documentation.

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✓ 100% Free to Use•✓ Instant AI Synthesis•✓ Zero Lock-In

OpenAPI 3.1 Specification

AI Engine Ready

Prompt > Generate OpenAPI 3.1 specs for POST /api/v1/auth/session with rate limits, bearer token auth, and schema validation

Input Controller:

export async function sessionHandler(req, res) {
  const { email, token } = req.body;
  if (!token) return res.status(401).json({ error: 'Missing token' });
  return res.json({ session: 'sess_99x', exp: 3600 });
}

Generated OpenAPI 3.1:

paths:
  /api/v1/auth/session:
    post:
      summary: Establish authenticated user session
      requestBody:
        content:
          application/json:
            schema:
              properties:
                email: { type: string }
                token: { type: string }
      responses:
        '200':
          description: Session active

Core Capabilities

Why Developers Rely on This Tool

Zero Friction

Automated Schema Discovery

Stop manually writing repetitive YAML files by hand.

✓Extracts query params, body payloads, headers, and status codes
✓Generates complete request & response example JSON schemas
✓Identifies authentication requirements (Bearer, API Key, OAuth2)

Multi-Format

Export to OpenAPI, Swagger & Markdown

Deliver documentation in whatever format your team and consumers demand.

✓Compliant OpenAPI 3.1 YAML and JSON output
✓Ready-to-publish Markdown for GitHub READMEs, Mintlify, and Docusaurus
✓Interactive curl and fetch code samples in 6 languages

Polyglot

Universal Language Support

Parse controllers from your favorite backend frameworks with ease.

✓TypeScript/Express, Fastify, NestJS
✓Python FastAPI, Flask, and Django REST Framework
✓Go Gin/Fiber and Java Spring Boot endpoints

Step-by-Step

How It Works in 3 Simple Steps

Paste Route Code

Provide your endpoint handler, controller function, or schema definition in any major backend language.

Deep Parameter Extraction

The AI parses input validation rules, required headers, response shapes, and error status branches.

Export Production Docs

Copy the valid OpenAPI 3.1 spec, download Swagger JSON, or generate user-facing developer guides.

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