REST API Tester — cURL-Like Checks in the Browser

Fire real HTTP requests at any CORS-enabled endpoint and inspect status, latency, headers and body — like a lightweight Postman in the browser.

Quick answer: Test REST APIs online free: GET/POST/PUT/DELETE with custom headers and JSON body, see status, timing and pretty-printed response. No signup, browser-side.

Method

URL

Headers (one per line) Body (JSON)

How to use

Set method + URL (https://).
Add headers/body if needed.
Send — read status, ms and response.

About this tool

A browser API client for quick checks: method, URL, headers (one per line), optional JSON body, and a clean report of status code, round-trip time and formatted response. Perfect for verifying your own endpoints, public APIs and webhooks. Honest limitation: browsers enforce CORS, so endpoints without permissive CORS headers will refuse browser calls — for those, use a server-side tool. Your request goes straight from your browser to the target; this site sees nothing. Your file never leaves this page — everything runs in your browser, there is no upload endpoint on this site, and the file is dropped from memory when you close the tab.

FAQ

Does this site see my requests?

No — the request goes directly from your browser to the target API.

Why does some API fail?

CORS: the target must allow browser origins. Public APIs like api.github.com do.

Can I test localhost?

Yes — http://localhost works from this page in most browsers.

Auth headers?

Add them as header lines (Authorization: Bearer …) — but only test your own tokens.

Response pretty-printed?

JSON responses are auto-formatted; others shown raw.

Rate this tool

Your rating stays in this browser (local storage) — nothing is sent to any server.

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The complete rest api tester guide

Prefer the long version — a worked example, the mistakes people actually make, and answers to real questions? The blog guide Rest Api Tester — Complete Guide, Mistakes & FAQ covers all of it step by step.

Browse the collection: Developer Tools — All 46 Free Online Tools

REST API Tester — cURL-Like Checks in the Browser

How to use

About this tool

FAQ

Rate this tool

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