100% Free · No Signup · Runs In Your Browser

API Tester

A full-featured REST client — headers, body modes, authentication, environment variables, request history, and cURL import/export. A free Postman alternative that needs no install.

🔌 API Tester

Send a request to see the response here

What API Tester does

Every method, every body typeGET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS, with JSON, form-urlencoded, or raw text bodies.

Auth built inBearer tokens, Basic auth, and API keys (as a header or query param) — no manual header-crafting needed.

Environment variablesDefine {{baseUrl}}-style variables once per environment and reuse them across the URL, headers, and body.

History & saved requestsEvery request you send is kept in local history; save the ones you'll reuse, all stored only in your own browser.

cURL import & exportPaste a cURL command from documentation to load it as a request, or export any request back to cURL to share or script.

Real requests, real responsesRequests go directly from your browser to the API you're testing — status, timing, size, headers, and body, exactly as the server returned them.

Like any browser-based API client, requests are subject to the target API's CORS policy — APIs that don't allow cross-origin requests from a browser will block the request the same way they would for any other web page.

Frequently Asked Questions

Why did my request fail with a CORS error?

Browsers block cross-origin requests unless the target server explicitly allows them via CORS headers. This affects any browser-based API client, not just this tool — APIs designed for public/browser use (most public REST APIs) work fine, while internal or backend-only APIs typically need to be tested from a server-side tool like cURL or Postman's desktop app instead.

Is my request data sent anywhere besides the API I'm testing?

No. Requests go directly from your browser to the URL you enter — nothing is proxied through, logged by, or visible to this site's own server.

Where is my request history and saved requests stored?

Entirely in your browser's local storage. Nothing is uploaded, and clearing your browser data will clear your history too.

Can I import a cURL command from API documentation?

Yes — paste any standard cURL command (method, headers, and body are parsed automatically) and it loads directly into the request builder.

What are environment variables for?

They let you define values like {{baseUrl}} or {{apiKey}} once per environment (e.g., "Staging" vs "Production") and reference them anywhere in your request — switching environments then updates every request that uses that variable.

API Tester Tool

Import from cURL

Environments