HAR File (HTTP Archive)

A HAR file (HTTP Archive) is a JSON-formatted recording of the network activity a browser captured during a session. It lists each request with its URL, headers, status code, size, and a detailed timing breakdown.

Why it matters

When someone says "your site is slow for me," a HAR file shows exactly what happened on their machine: which request was slow, whether DNS or the server was to blame, and which resources failed. It is the standard way to share a reproducible network trace with support or another developer.

Example

In Chrome, open DevTools, go to the Network tab, tick Preserve log, reload the page, then right-click the request list and choose to save all as HAR. A trimmed entry looks like this:

{
  "request": { "method": "GET", "url": "https://example.com/app.js" },
  "response": { "status": 200, "content": { "size": 184320 } },
  "timings": { "dns": 12, "connect": 40, "ssl": 35, "wait": 310, "receive": 90 }
}

Here wait is roughly the time to first byte for that request.

Common mistakes

• Sharing a HAR publicly without sanitizing it. It can contain cookies, session tokens, authorization headers, and form data. Strip or redact them first.
• Recording with cache enabled and then wondering why requests are missing.
• Reading the total load time instead of the individual timings.
• Capturing with extensions active, which adds unrelated requests.

Related

• Waterfall chart
• TTFB
• Page weight
• Latency

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