HAR Analyzer Online

A HAR file is a JSON-based log of browser network activity. It can contain requests, responses, URLs, HTTP status codes, headers, transfer sizes, and timing information. HAR files are commonly captured when debugging slow pages, failed requests, redirects, API calls, or other network problems.

A HAR file can be opened with a HAR viewer or analyzer that parses the network log into readable requests and timing details. In the analyzer above, load the .har file from your device and inspect requests, status codes, durations, and other debugging information in a structured view.

Start with failed status codes, unusually slow requests, redirects, and requests with large transfer or waiting times. Then inspect the relevant request details instead of reading the raw HAR JSON line by line. The analyzer above helps reduce a large network trace to the requests and timings that deserve attention.

Open Chrome DevTools, go to the Network panel, reproduce the problem, and export the recorded network log as a HAR file. Once the file is saved, you can load it into a HAR analyzer to inspect the captured requests and timings. Be careful when sharing HAR files because they can contain sensitive request data.

Capture a HAR while reproducing the exact problem you want to investigate. Start network recording before the relevant action, reproduce the issue, and then export the captured requests. Keeping the capture focused makes the resulting HAR easier to analyze and reduces unrelated network noise.

Look for non-success status codes, long request durations, excessive waiting time, redirects, and groups of requests that block the page or API flow. Use the analyzer above to filter the network log and inspect the timing details of suspicious requests instead of manually searching through the raw HAR file.