API Tester
Light Postman replacement
API Tester is on the roadmap. In the meantime, explore the other developer tools.
What is API Tester?
A lightweight, in-browser API tester for sending GET / POST / PUT / PATCH / DELETE requests with custom headers, query parameters, and a JSON or form body. Inspect the response status, headers, and body (with JSON pretty-printing) without leaving the page. Useful for quick checks against a public API, debugging webhook payloads, or prototyping a request before pasting it into code.
How do I use API Tester?
- Enter the URL and pick the HTTP method.
- Add headers and query params via the rows.
- Type a body (JSON or form-encoded) for POST / PUT / PATCH.
- Click Send and read the response status, headers, and body.
When should I use API Tester?
API Tester is for one-off interactive requests. To convert a working request into language-specific code, use cURL to Code. For testing locally without a real backend, mock servers like httpbin.org pair well with this tool.
Are CORS-blocked requests handled?
No — browser security applies. If the target API does not set Access-Control-Allow-Origin for our domain, the request fails. Use a desktop tool (Postman, Insomnia) or a server-side proxy for those.
Is auth supported?
Yes via headers (Authorization: Bearer …, X-API-Key, etc.). Add the header in the headers panel; basic auth credentials are encoded automatically if you use the dedicated field.
Can I save requests for later?
Not yet — this is a quick-test tool, not a full collection manager. For saved collections, environments, and history, Postman or Insomnia is a better fit.
Is my file uploaded anywhere?
No. Everything runs in your browser. Your files never leave your device, and there is no server component for this tool.