API Documentation Generator

Generate structured API documentation from supplied endpoints, authentication, parameters, schemas, responses, and examples.

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Maximum 12,000 characters.0 / 12,000

About API Documentation Generator

Use this free AI API documentation generator to document REST, HTTP, webhook, or internal service endpoints. Provide the API name, base URL, methods, paths, authentication, parameters, request and response schemas, status codes, errors, examples, versioning, and limits. The tool uses only supplied technical details and marks missing information.

How to Use

  1. Describe the API and provide the base URL or service context.
  2. List each endpoint, method, parameters, authentication, and schemas.
  3. Add response examples, errors, rate limits, and versioning details.
  4. Click the Generate button.
  5. Verify the documentation against the actual implementation and tests.

Perfect For

  • Documenting a REST API
  • Creating internal service documentation
  • Writing endpoint reference pages
  • Documenting webhook payloads
  • Preparing developer onboarding material

Practical Examples

Example input: “API: Accounts API. Base URL: https://api.example.com/v1. Auth: Bearer token. Endpoint: GET /accounts/{id}. Path parameter id: string, required. 200 response: account object. 401: invalid token. 404: account not found.” The generator can turn these supplied facts into a structured endpoint reference without inventing undocumented fields or behavior.

Example output shape: API Overview; Authentication; Base URL and Versioning; Endpoints; method and path; purpose; parameter table; request body where supplied; response status table and JSON examples; errors; rate limits, pagination, and idempotency where supplied; and a final Missing or Conflicting Information section.

Missing-data example: if you provide an endpoint but omit authentication or a response schema, the documentation should identify the missing information rather than inventing a token format, JSON fields, status codes, SDK usage, or rate limits.

FAQ

Can this tool document an API from only a URL?

No. It does not inspect or call a live API. Supply the endpoint details you want documented, including methods, paths, authentication, parameters, schemas, responses, errors, examples, versioning, and limits where known.

Does the generator execute API examples?

No. Generated examples are not claimed to have been executed or validated. Compare the result with the implementation, tests, OpenAPI specification, or other authoritative technical source before publishing.

What happens when technical information is missing or inconsistent?

The prompt instructs the generator to identify missing information and conflicting endpoint definitions instead of silently filling gaps with invented technical details.

What types of API documentation can I prepare?

The tool can organize supplied details for REST or HTTP APIs, webhooks, internal services, endpoint reference pages, and developer onboarding material. The quality of the result depends on the completeness and accuracy of the technical input.