Online API Tester
Test REST APIs in your browser — send any HTTP request, paste a cURL, and bypass CORS. No signup.
The Online API Tester lets you send any HTTP request — GET, POST, PUT, PATCH, DELETE and more — straight from your browser and inspect the full response: status, timing, size, headers, and a pretty-printed body. No account, no install, no Postman download.
Paste a URL or a cURL — it just works
Drop a plain URL in the address box, or paste an entire cURL command. The tester auto-detects cURL and unpacks it into the method, query params, headers, authentication, and body automatically — so you can go from a copied command to a live request in one paste. You can also copy any request back out as cURL.
Built to beat CORS
Browsers block most cross-origin API calls (CORS). This tester tries a direct request first and, when the browser blocks it, transparently retries through a hardened server-side proxy — so you always see the real status and every response header, which browser-only testers can’t show.
You can use that proxy in your own projects too: prefix any URL with https://webtoolx.com/api/proxy/ and the response returns with permissive CORS headers. It’s a quick, no-signup CORS proxy for prototypes and demos (fair-use limits apply).
Private by design
The proxy is a transient relay: your request and response bodies are never logged or stored. Request history and saved calls live only in your browser. Please only test APIs you own or are authorized to test.
Frequently Asked Questions
Is the API Tester free?↓
Yes — it works in your browser with no signup. Requests routed through our proxy are rate-limited per day; signing in raises the limit.
How does it get around CORS?↓
It first tries a direct browser request. When the API blocks cross-origin calls (CORS), it transparently retries through our server-side proxy so you still get the full response and all headers.
Can I paste a cURL command?↓
Yes. Paste a full cURL into the address box and it is auto-detected and unpacked into the method, URL, headers, auth, and body for you.
Can I use it as a CORS proxy in my own app?↓
Yes. Prefix any URL with our proxy — https://webtoolx.com/api/proxy/<your-url> — and the response comes back with permissive CORS headers. Fair-use rate limits apply.
Do you store my requests?↓
No. The proxy is a transient relay — request and response bodies are never logged or stored. Your history and saved requests stay in your browser.