Why HTTP API Tester?
When an API call fails, the fastest way to know why is to send the request yourself and look at the raw response. This tester does that from the browser - method, headers, body, real status code, real response headers - without installing Postman and without CORS getting in the way, because the request goes out from the edge instead of your tab.
- Reproduce the exact call from a bug report or docs page: same method, same headers, same body - then read the actual response instead of the summary in an error message.
- Add an Authorization header when testing authenticated endpoints; tokens are forwarded with the request and never stored.
- Use the Sample button to see the shape of a request/response cycle, then point the tool at your own endpoint.
- Pair it with the cURL to Code Converter to turn a working request into Python or Node.js code for your test suite.
What is HTTP API Tester?
HTTP API Tester is a browser-based REST client: pick a method, enter a URL, add headers and a JSON body, and send the request. It shows the real status code, response headers, and body — pretty-printed when the response is JSON. Requests run through a server-side proxy, so there are no CORS errors and no extension or app to install.
Common Use Cases
API Development
Exercise your own endpoints during development without leaving the browser — headers, auth tokens, and JSON bodies included.
Debugging Integrations
Reproduce an API call from a bug report or docs page exactly as written and see the raw response the server actually returns.
Test Automation Prep
Verify methods, headers, and payloads against a staging API before committing them to a test suite or Postman collection.
Learning
Explore public APIs (REST, JSON) interactively — see how methods and headers change the response.
How to Use This Tool
- Enter the request URL and pick a method (GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS)
- Add any headers you need — for example an Authorization token or Content-Type for JSON bodies
- For methods that carry a body, type or paste it and pick the Content-Type (auto, JSON, form, or text)
- Click Send Request and inspect the status code, response headers, and body — use Pretty/Raw to toggle JSON formatting
Related Tools
Learn More
- MDN — HTTP request methods Reference for GET, POST, PUT, PATCH, DELETE, and the rest of the HTTP verb set.
- MDN — HTTP headers The full catalog of HTTP headers you can send and receive.