REST API Tester
A lightweight browser HTTP client for hitting REST endpoints. Choose a method, set headers and a body, send, and inspect the status, timing, headers and formatted response.
The REST API Tester is a small HTTP client that lives in your browser, so you can fire a request at an endpoint and read the reply without opening Postman or a terminal. Pick a method, type the URL, add header rows, and paste a JSON body for POST, PUT or PATCH calls. Hit Send and you get the status code, how long the round trip took, the response headers, and the body pretty-printed when it is JSON. Because it runs in the browser it can only reach APIs that return permissive CORS headers, a limit every in-browser tester shares rather than a fault in the request.
How it works
- 1
Set the method and URL
Choose GET, POST, PUT, PATCH, DELETE, HEAD or OPTIONS, then type the endpoint you want to call, such as https://api.example.com/v1/users.
- 2
Add headers and a body
Fill in key/value header rows like Authorization or Content-Type, adding or removing rows as you go. For write methods a JSON body field appears for your payload.
- 3
Send and read the response
Press Send to run the fetch. The status code is colour-coded by class, the response time shows in milliseconds, and a JSON body is formatted automatically.
Instant & 100% private — nothing is uploaded
Everything runs locally in your browser. Your code, text and files are processed on your own device and are never sent to a server — so there are no upload waits, no size limits from us, and nothing is ever stored or logged.
Frequently asked questions
- Why does my request fail with a CORS or network error?
- A page in the browser can only read a response when the target API sends an Access-Control-Allow-Origin header that permits your origin. Many public APIs don't, so the browser blocks the read and you see a CORS or network error. The same call often works from curl or a server, which aren't bound by the same-origin policy. This applies to every browser-based API tester.
- How do I send a POST request with a JSON body?
- Set the method to POST, add a header row Content-Type: application/json, and paste your payload into the body field, for example { "title": "Test", "completed": false }. Sending that to https://jsonplaceholder.typicode.com/posts returns a 201 Created with the new record echoed back.
- Which HTTP methods can I use?
- GET, POST, PUT, PATCH, DELETE, HEAD and OPTIONS. GET and HEAD are sent without a body, since the Fetch standard forbids one there; the body field only appears for methods that carry a payload.
- Can I set an Authorization header or bearer token?
- Yes. Add a header row named Authorization with a value like Bearer eyJhbGci..., and it goes out with the request. Whether the call succeeds still depends on the API's CORS policy for browser origins.
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