REST API & cURL Tester (Postman Alternative)

The REST API tester is a lightweight, browser-based alternative to Postman or Insomnia for quick checks. You compose an HTTP request, send it straight from your browser and inspect the response status, headers, timing and body, with JSON pretty-printed for readability. There is nothing to install and no account to create.

How to use it

1. Choose the HTTP method and enter the endpoint URL.
2. Add request headers such as Authorization or Content-Type: application/json.
3. For POST, PUT or PATCH, add a request body.
4. Send the request and review the status code, response time and formatted body.

Example request

Method POST, URL https://httpbin.org/post, header Content-Type: application/json and body { 'name': 'test' } written as valid JSON with double quotes. The response is a 200 OK that echoes your JSON back, which makes it a good way to check that headers and body are being sent as you expect.

Understanding CORS errors

Because requests are sent by your browser, the target API must allow cross-origin requests. If the server does not return an Access-Control-Allow-Origin header, the browser blocks the response and you see a network or CORS error even though the server may have processed the request. This is a browser security rule, not a bug in the API. For such endpoints, use the generated cURL command from a terminal instead.

Tips

• Check the status code first: 2xx is success, 4xx means the request was wrong, 5xx means the server failed.
• Never paste production secrets into shared machines; tokens stay in your browser tab only.