Web tool / 09
HAR File Network Log Inspector
Parse browser HTTP Archive (.har) export logs locally — analyze network waterfalls, response status codes, and timing without uploading logs.
HAR File Network Log Inspector: TOEA extracts request methods, URLs, status codes, content sizes, and timing metrics from browser HAR files. Runs 100% locally in your browser with zero server file uploads.
- Category
- Web tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
Network Log Summary
HTTP Requests Breakdown
| # | Method | Status | URL | MIME Type | Size | Time |
|---|---|---|---|---|---|---|
| 1 | GET | 200 | https://example.com/ | text/html | 3.4 KB | 85 ms |
| 2 | GET | 200 | https://example.com/styles.css | text/css | 12.1 KB | 42 ms |
| 3 | GET | 401 | https://example.com/api/user | application/json | 0.1 KB | 110 ms |
Recording a useful HAR file
Open the browser's developer tools on the Network tab before loading the page, tick Preserve log so redirects and page changes are kept, and tick Disable cache if you want to see every file downloaded fresh. Reproduce the problem, then export. Chrome offers a sanitized export that leaves out cookies and authorization headers; use it when sending the file to someone else. A full export contains session cookies and tokens that can sign someone into your account, so never attach one to a public ticket.
Reading the entries
A status of 0 means no response arrived: the request was blocked by an ad blocker or a browser security rule, cancelled because the page navigated away, or failed at the network level. Those are often the cause of the problem being investigated.
The size shown is the transferred body where the file records it, otherwise the uncompressed content size, so responses served from cache can show their full size. Compare a slow request's time with the HTTP status checker to see whether the server is slow for everyone.
How to use it
- Paste exported .har JSON content into the editor.
- Review total request counts, transferred size, and status code distribution.
- Inspect individual HTTP request entries, MIME types, and durations.
Privacy & limitations
HAR logs contain session cookies and authorization tokens. Processing runs 100% in local memory without uploading files.
Related tools
Frequently asked questions
Are sensitive session cookies safe?
Yes, because your HAR file is never transmitted to any server.
Which browser HAR files are supported?
Supports standard HAR v1.2 files exported from Chrome, Firefox, Safari, and Edge developer tools.
Free tool · runs in your browser · no account required