API Lens — Response Inspector

About

API Lens adds a panel next to Console and Network in Chrome DevTools that makes inspecting API traffic faster and less painful.

Most JSON debugging today means bouncing between the Network tab, an external formatter, and a separate diffing tool. API Lens keeps all of it in one place:

Automatic capture — every XHR and fetch call the page makes shows up in a live list, with method, status, response time, and size at a glance.

Readable responses — JSON is pretty-printed and collapsible automatically, including nested JSON that's been double-escaped into a string (common in event-logging and GraphQL-style APIs), which API Lens detects and expands for you.

Search within a response — find a key or value instantly without scrolling through a wall of text.

Pin and diff — pin any two requests to compare their responses side by side, useful for catching regressions or unexpected response changes between calls.

Safe-by-default cURL export — copy any request as a ready-to-run cURL command. Cookies, auth tokens, session IDs, and CSRF tokens are automatically redacted by default, so you can safely paste a command into a bug report or share it with a teammate without leaking credentials. A separate "with credentials" option is available when you genuinely need the full runnable command, with a confirmation step before anything sensitive is copied.

Preserve log — like the Network tab's own toggle, your capture history survives page reloads so you don't lose context mid-debugging session.

Filter by status — quickly narrow the list to just 4xx or 5xx responses when you're hunting for what broke.

Privacy: API Lens makes no network requests of its own, sends no data anywhere, and stores nothing outside your current DevTools session. It only reads network activity from the page you already have open in DevTools — the same data Chrome's own Network tab already shows you.

Built for developers debugging real APIs, not a generic network monitor. If you've ever copy-pasted a response into an online JSON formatter just to read it, this is for you.