I Test All My APIs in Chrome DevTools. Here's How.

Chrome ships with everything you need to test REST APIs without installing a separate client. Full disclosure: I built JSON Formatter Pro as part of Zovo, a collection of 16 Chrome extensions I maintain. Take my perspective accordingly. I run API tests in DevTools dozens of times a day. The Console gives you a full JavaScript REPL for firing HTTP requests. The Network panel captures every call with header inspection, timing breakdowns, and response previews. And because fetch() runs in your page's context, you test against live cookies, tokens, and session state without copy-pasting anything. This guide covers the native methods I actually use, from basic fetch() calls to response mocking and performance profiling. I wrote a more detailed version with additional examples if you want to go deeper. How Chrome Handles API Requests Every HTTP request flows through Chrome's multi-process architecture. When your JavaScript calls fetch(), the request starts in the renderer process, crosses in