HAR Network Analyzer: practical guide

Inspect request waterfalls, failures, payloads and network timing.

Use the guide alongside the working tool.

Explicit sample

{"log": {"version": "1.2", "creator": {"name": "Sample capture", "version": "1"}, "entries": [{"startedDateTime": "2026-10-28T09:00:00.000Z", "time": 200, "request": {"method": "GET", "url": "https://example.com/", "httpVersion": "HTTP/2", "headers": [{"name": "Authorization", "value": "Bearer SAMPLE_NOT_A_SECRET"}], "cookies": [], "queryString": []}, "response": {"status": 200, "statusText": "OK", "httpVersion": "HTTP/2", "headers": [{"name": "Content-Type", "value": "text/html"}], "cookies": [], "content": {"size": 24000, "mimeType": "text/html", "text": "SAMPLE BODY"}, "bodySize": 12000, "redirectURL": ""}, "cache": {}, "timings": {"blocked": 0, "dns": 10, "connect": 20, "ssl": 10, "send": 2, "wait": 120, "receive": 10}}, {"startedDateTime": "2026-10-28T09:00:01.000Z", "time": 150, "request": {"method": "GET", "url": "https://example.com/assets/app.js?token=sample", "httpVersion": "HTTP/2", "headers": [{"name": "Authorization", "value": "Bearer SAMPLE_NOT_A_SECRET"}], "cookies": [], "queryString": [{"name": "token", "value": "sample"}]}, "response": {"status": 200, "statusText": "OK", "httpVersion": "HTTP/2", "headers": [{"name": "Content-Type", "value": "application/javascript"}], "cookies": [], "content": {"size": 180000, "mimeType": "application/javascript", "text": "SAMPLE BODY"}, "bodySize": 90000, "redirectURL": ""}, "cache": {}, "timings": {"blocked": 0, "dns": 10, "connect": 20, "ssl": 10, "send": 2, "wait": 40, "receive": 10}}, {"startedDateTime": "2026-10-28T09:00:02.000Z", "time": 450, "request": {"method": "GET", "url": "https://example.com/api/items", "httpVersion": "HTTP/2", "headers": [{"name": "Authorization", "value": "Bearer SAMPLE_NOT_A_SECRET"}], "cookies": [], "queryString": []}, "response": {"status": 503, "statusText": "Unavailable", "httpVersion": "HTTP/2", "headers": [{"name": "Content-Type", "value": "application/javascript"}], "cookies": [], "content": {"size": 500, "mimeType": "application/javascript", "text": "SAMPLE BODY"}, "bodySize": 250, "redirectURL": ""}, "cache": {}, "timings": {"blocked": 0, "dns": 10, "connect": 20, "ssl": 10, "send": 2, "wait": 400, "receive": 10}}, {"startedDateTime": "2026-10-28T09:00:03.000Z", "time": 25, "request": {"method": "GET", "url": "https://example.com/logo.svg", "httpVersion": "HTTP/2", "headers": [{"name": "Authorization", "value": "Bearer SAMPLE_NOT_A_SECRET"}], "cookies": [], "queryString": []}, "response": {"status": 200, "statusText": "OK", "httpVersion": "HTTP/2", "headers": [{"name": "Content-Type", "value": "application/javascript"}], "cookies": [], "content": {"size": 3000, "mimeType": "application/javascript", "text": "SAMPLE BODY"}, "bodySize": 1500, "redirectURL": ""}, "cache": {}, "timings": {"blocked": 0, "dns": 10, "connect": 20, "ssl": 10, "send": 2, "wait": 10, "receive": 10}}]}}

Inspect request waterfalls, failures, payloads and network timing.

Prepare your input

Inspect request waterfalls, failures, payloads and network timing.

Use the labeled working sample to see the accepted format. Replace it with your own input, select the relevant options, and run the tool. Supporting controls remain in the bounded editor window.

Understand the result

Up to 5 MB / 5,000 HTTP Archive entries. Timing phases with -1 are unavailable, not zero; SSL is a subset of connect and is not double-counted. Body size excludes headers and may be unavailable. HAR files can contain credentials; processing and export stay local. This inspects an uploaded capture, not live site performance.

Export deliberately

Record exports contain the complete selected dataset; reports summarize up to 100 records. Artifacts contain the actual generated configuration, sanitized capture or compressed bytes. Review configuration before publishing it.

Input stays in browser memory. No remote page fetching, account access or file upload is performed.

Ready to apply this workflow?

Try HAR Network Analyzer →

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All practical guides →

Keep your original files and review the result. Found unclear instructions? Contact Team Hypomnema.