Inspect HTTP Archive (.har) network requests, payload sizes, status codes, and waterfall timing locally.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Upload your exported browser HAR file or paste the JSON content.
Review request durations, transferred payload sizes, and HTTP status codes.
Identify slow API endpoints and oversized asset transfers.
Yes, 100% of the HAR JSON parsing and waterfall rendering executes locally inside your browser memory with zero network uploads.
Open DevTools (F12) -> Network tab -> perform your page actions -> right-click any request -> select 'Save all as HAR with content'.
Zero-egress companion tools in the Developer Tools suite
Format, validate, repair, and minify JSON data instantly.
Decode, verify claims, inspect headers, and check token expiry.
Test regex patterns with flags, group captures, and live matches.
Compare text or source code side-by-side with visual diffs.
