Online API Tester
Send GET, POST, PUT and DELETE requests to any REST API — headers, query params and JSON body — and inspect the response. Free.
Compose a request and send it through our server, so browser CORS never blocks you. Public HTTPS endpoints only.
Response
Send a request to see the status, headers and response body here.
Giới thiệu về Online API Tester
The Online API Tester is a REST client that lives in a browser tab. Pick a method — GET, POST, PUT, PATCH, DELETE, HEAD or OPTIONS — type an endpoint, add query parameters and headers as key/value rows, paste a JSON or form body, and send. The response comes back with its status, timing, size, headers and a pretty-printed body.
Requests are relayed through our server rather than issued by the browser, which is what makes it work against APIs that send no CORS headers — the usual reason a fetch from the console fails. The trade-off is that the endpoint sees our server as the client: your own IP address is never revealed to the target, but IP allow-lists on the API side will reject the call.
The proxy is deliberately constrained: public http and https hosts on the standard ports only, up to 40 header rows, a request body of up to 100,000 characters, a 15-second response timeout, and a response body captured up to 200,000 characters with truncation flagged. Redirects are not followed, so a 301 or 302 is shown exactly as returned.
Cách sử dụng Online API Tester
- Choose the HTTP method and enter the endpoint URL.
- Add query parameters on the Params tab — they are appended to the URL before sending.
- Set your headers on the Headers tab, for example Content-Type and Authorization.
- Paste the request payload on the Body tab for POST, PUT, PATCH or DELETE.
- Click “Send request”, then read the status, timing and size, and switch between the response body and its headers.