An API tester (or REST client) lets you send HTTP requests to any URL and inspect the response. Developers use API testing tools to debug endpoints, verify integrations, test authentication, and explore third-party APIs. This tool is a lightweight, browser-based alternative to desktop apps like Postman and Insomnia.
This tool supports all standard HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. Select the method from the dropdown, enter your URL, and click Send.
The Auth tab supports Bearer Token (sends Authorization: Bearer <token>) and Basic Auth (sends Base64-encoded username:password). For other auth methods, add the appropriate header manually in the Headers tab.
Because this tool runs in your browser, requests are subject to CORS (Cross-Origin Resource Sharing) restrictions. Many public APIs work fine, but some servers may block browser-based requests. If you get a CORS error, the API likely doesn't allow requests from web browsers. You can use a CORS proxy or test from a backend client instead.
Requests go directly from your browser to the target API. No data passes through TerminalFeed servers. Request history is saved in localStorage on your machine only.