What is the easiest way to create docs for an API?

The easiest way is usually to generate docs from your API schema/spec, instead of writing them manually.

Best simple options

1. OpenAPI / Swagger

If your API is RESTful, this is the most common route.

• Define your endpoints in an OpenAPI spec (openapi.yaml or openapi.json)
• Use tools like:
  • Swagger UI — interactive docs
  • Redoc — clean, readable docs
  • Stoplight — nice editor + docs
• Many frameworks can generate the spec for you:
  • FastAPI: automatic docs built in
  • Spring Boot: springdoc-openapi
  • Express: swagger-jsdoc / tsoa
  • Django REST Framework: drf-spectacular / drf-yasg

Why this is easiest:
You write the schema once, and the docs update with your API.

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2. Use built-in framework docs

If you’re using a framework that supports it, this is often the fastest.

Examples:

• FastAPI → automatic Swagger UI and ReDoc
• NestJS → Swagger module
• ASP.NET Core → Swagger/OpenAPI support
• Spring Boot → springdoc-openapi

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3. Docs from Postman collections

If you already test your API in Postman:

• Export a Postman collection
• Publish it as documentation
• Good for quick start guides and examples

This is simpler, but usually less robust than OpenAPI.

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If you want the absolute easiest path

• REST API: use OpenAPI + Swagger UI
• GraphQL API: use GraphQL introspection + GraphiQL / Apollo Sandbox
• FastAPI: you get docs almost for free

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My recommendation

If you haven’t started yet, do this:

1. Create an OpenAPI spec
2. Use Swagger UI or Redoc
3. Add example requests/responses
4. Publish it alongside your API

If you tell me what stack you’re using, I can suggest the simplest setup for that specific framework.