GratisAPI Builder

Turn a file into an API.

Drop in a CSV, TSV, JSON, YAML or spreadsheet and get a complete, documented static API — endpoints, an OpenAPI spec and a README — as a ready-to-deploy folder. It all happens in your browser: nothing is uploaded anywhere.

1 · Your data

— or paste —

2 · Configure

3 · Your API

Add data to see your endpoints…

GET /api/<name>/index
Waiting for data…
GET /api/<name>/<id>
Waiting for data…

A ready-to-deploy folder: clean endpoints, openapi.json, README.md, _headers. Unzip and drop on GitHub Pages, Cloudflare Pages, Netlify or S3.

How it works

1 Parse

Your file is read and parsed locally — CSV/TSV, JSON, YAML, or an Excel sheet. Numbers and booleans are detected automatically.

2 Generate

Each row becomes a record at /api/<name>/<id>, plus a listing endpoint, an OpenAPI 3.1 spec and a README.

3 Deploy

Download the folder and host it anywhere static. No server, no keys — a real API, exactly like GratisAPI itself.