REST API Tester Online — Send HTTP Requests from Your Browser (Free)

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.

Questions people ask about REST API Tester

Collected from live search results on 04 Sep 2026 (search-engine "people also ask" boxes plus the questions published on ranking pages).

How do I test a REST API?