HTTP Archive — a JSON dump of network activity from browser DevTools. Captures every request, response, timing, headers, and body.

What does the viewer show?

Waterfall chart of requests, per-request details (timing, size, headers, body), and summary stats (total time, transferred bytes, blocking requests).

Can I see the response body?

Yes — full request and response bodies are in the HAR. The viewer displays them with content-type-aware rendering (JSON, HTML, images).

Parse and summarize HTTP Archive (HAR) files. Part of the DevTools Surf developer suite. Browse more tools in the Developer Utilities collection.

The HAR (HTTP Archive) format was standardized by the W3C Web Performance Working Group in 2012, based on work by Jan Odvarko of Mozilla.
A single page load on a modern website can generate a HAR file with over 200 entries, sometimes exceeding 10 MB in size.
HAR files can accidentally contain sensitive data like cookies and auth tokens — the spec includes a 'comment' field to flag redacted entries.

What's a HAR file?: HTTP Archive — a JSON dump of network activity from browser DevTools. Captures every request, response, timing, headers, and body.
What does the viewer show?: Waterfall chart of requests, per-request details (timing, size, headers, body), and summary stats (total time, transferred bytes, blocking requests).
Can I see the response body?: Yes — full request and response bodies are in the HAR. The viewer displays them with content-type-aware rendering (JSON, HTML, images).

Parse and summarize HTTP Archive (HAR) files. Part of the DevTools Surf developer suite. Browse more tools in the Developer Utilities collection.

The HAR (HTTP Archive) format was standardized by the W3C Web Performance Working Group in 2012, based on work by Jan Odvarko of Mozilla.
A single page load on a modern website can generate a HAR file with over 200 entries, sometimes exceeding 10 MB in size.
HAR files can accidentally contain sensitive data like cookies and auth tokens — the spec includes a 'comment' field to flag redacted entries.

What's a HAR file?: HTTP Archive — a JSON dump of network activity from browser DevTools. Captures every request, response, timing, headers, and body.
What does the viewer show?: Waterfall chart of requests, per-request details (timing, size, headers, body), and summary stats (total time, transferred bytes, blocking requests).
Can I see the response body?: Yes — full request and response bodies are in the HAR. The viewer displays them with content-type-aware rendering (JSON, HTML, images).