API Documentation Generator
Turn your endpoints into clear, complete API documentation
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When did anyone last enjoy writing API docs? Is your README still describing the endpoint you shipped two releases ago? When a frontend developer asks what the orders route returns, do you paste a curl command and hope?
API Documentation Generator writes that page for you. Describe the endpoint in plain words and it returns documentation with example requests and responses.
Short answer: API Documentation Generator is a free AI tool on EizTools that turns a short endpoint description into readable API documentation. Choose the language or framework, the API style, the auth method and the output, then generate docs, examples and matching code.
What is API Documentation Generator?
API Documentation Generator is a developer tool that documents an endpoint from your description of it. The prompt box asks for the API or endpoint you need: the resource, the methods and the fields. Back comes written documentation, usually with an example request, an example response and the route code beside it. It never reads your repository, so it documents what you tell it.
How Does API Documentation Generator Work?
Describe the endpoint, pick a model from the selector, open the advanced options and press generate. The result appears in the output card with a word count and reading time, ready to copy, download as TXT, Word or HTML, or reopen in the editor to adjust the brief. Recent generations sit in the activity history panel. Four dropdowns set the shape, and each starts on None.
| Option | What it controls | Suggested start |
|---|---|---|
| Language / Framework | The stack the samples are written for, Node / Express to Laravel, Django or Go | Your real framework, or Auto for docs only |
| API Style | REST, GraphQL, RPC, CRUD, Webhook or Microservice | REST, unless the service is GraphQL |
| Output | Endpoint Code, Full Route, Code + Docs, Code + Tests or Spec / Schema | Code + Docs, the useful pairing |
| Auth | None, API Key, JWT, OAuth, Session or Basic | JWT, if the service already uses it |
What Lands In The Output Card
Request and response
Include Examples adds a sample call and a sample payload, which is the part reviewers read first.
Validation rules
Include Validation writes the field rules out, so required and optional stop being a guess.
Error cases
Include Error Handling documents the status codes the route can return and when each one fires.
Detail Level, The Toggles And Custom Instructions
Detail Level is a percentage slider. Around 30 gives a short reference block. Push it past 70 when the docs are for people outside your team and every field needs explaining. Include Docs adds prose around the code rather than comments alone. Custom Instructions holds naming rules, a version prefix or your standard response envelope, and it is what makes the output match your codebase instead of a textbook.
From Endpoint To Pull Request
Say you are adding a paginated orders endpoint to a Laravel service. Type the resource, the methods, the query parameters and the fields returned. Set Language / Framework to Laravel, API Style to REST, Output to Code + Docs and Auth to JWT.
GET /orders. Paginated list, filters by status and date range.
Returns id, customer_id, status, total, created_at.
Errors: 401 unauthenticated, 422 bad filter.Read the draft against the real handler, fix what drifted, then commit the docs alongside the route. If the query behind that list still needs writing, the SQL Generator covers it, and the rest of the developer tools sit under Coding Tools.
Habits That Keep The Docs Honest
- One endpoint per generation. Three routes at once gives shallow docs for all three.
- Name the field types. “total, decimal, minor units” beats “total”.
- Say what errors exist, or the model invents plausible status codes.
- Regenerate when the contract changes. Stale docs are worse than none.
Important Never paste real keys, tokens or production URLs into the prompt box. Describe the auth method instead. Everything generated is a draft that has to be checked against the running code before it ships.
EizTools is a free AI tools platform with a dedicated tool for each job, and the API Documentation Generator needs no account, no key and no payment. You choose which AI model runs the request, so an endpoint that came back thin on one engine can be generated again on another.
Frequently Asked Questions
Can it read my repository or an existing OpenAPI file?
No. It works only from the text you type. Paste the relevant route signature or field list into the prompt box and it documents that.
Which frameworks does it write samples for?
The dropdown covers Node / Express, Python / FastAPI, Django, Laravel, Spring, Go, Ruby on Rails and .NET, plus Auto for docs without framework specific code.
Is the generated code safe to ship?
Treat it as a draft. Review the validation rules and error paths yourself, run your tests, and check anything touching authentication before it goes anywhere near production.
What does the Spec / Schema output give me?
A structured description of the endpoint rather than route code, which helps when a schema file is the source of truth for your API.
Documentation slips because it is written last, once the interesting work is done. Generating a first version in a minute changes the order: you correct something while the endpoint is still fresh in your head. Describe your route in the box above, set the framework and the output, and start from a draft.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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