Free API client lab: Send API requests and read responses, like Postman, in your browser.

A Postman-style API client with a request builder — method, URL, query params, headers, bearer auth and a JSON body — and a response viewer showing status, time, headers and a pretty-printed body. A built-in reference lists the practice APIs you can call. Everything runs locally; no real network is touched.

Free, no login, nothing to install. Your work stays in this browser.

What you can do

• Build and send GET, POST, PUT, PATCH and DELETE requests
• Set query parameters, headers, a JSON body and a bearer token
• Read the status, timing, response headers and pretty-printed body
• Browse the built-in API reference and load endpoints with one click

Graded, AI-assisted versions live in API and backend development courses and projects.