About HAR Analyzer
A HAR analyzer helps you inspect an exported HTTP Archive file for request counts, transferred bytes, status codes, and slow resources in one place. It is useful when you need a quick summary of a page load, API workflow, or browser session before you open a larger performance tool or share findings with another engineer.
How to Use HAR Analyzer
- 1Export the HAR file from your browser or debugging tool and load the raw archive into the analyzer.
- 2Review the summary counts, response sizes, status code breakdowns, and the requests that took the longest to finish.
- 3Use the findings to narrow down which endpoints, assets, or headers need deeper investigation in your browser, app, or CDN configuration.
Common Use Cases for HAR Analyzer
Front-end performance triage
Spot oversized assets, repeated requests, or unusually slow endpoints when a page feels sluggish and you need a short list of suspects.
API error analysis
Check which requests returned failures, redirects, or unexpected status codes after a browser-based workflow breaks in staging or production.
Before-and-after comparisons
Summarize two captured sessions so you can show whether an optimization actually reduced requests, bytes, or slow network calls.
Frequently asked questions
What kind of HAR file should I load?
Use the original archive exported from your browser devtools, proxy, or performance capture tool. Keeping the raw request timing and header data intact makes the analysis more useful than a manually edited snippet.
Can a HAR summary diagnose every network problem on its own?
Treat it as a fast starting point. The archive highlights patterns, but you may still need browser timelines, server logs, cache rules, or API traces to confirm the root cause of a performance or reliability issue.