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HAR File Analyzer

Analyze browser HAR files for slow requests, failed calls, duplicates, domains, and captured request timing.

What is HAR File Analyzer?

HAR File Analyzer helps frontend, backend, and support engineers turn browser network exports into a readable incident summary without uploading sensitive request data.

Use it to inspect captured browser network traffic for failed requests, slow endpoints, status codes and request timing.

How to use HAR File Analyzer?

Step 1

Try the included example input, then replace it with a redacted sample from the system you are debugging.

Step 2

Export a HAR file from your browser network tab and upload it.

Step 3

Review slowest requests, failures, duplicate calls, domain totals, summed durations, and elapsed capture time.

Step 4

Copy or export the summary after redacting sensitive URLs, headers, or IDs.

Example input / output

Review the count of 4xx and 5xx requests and the slowest calls and share a redacted summary instead of the original archive.

Review the result for completeness before copying it into code, a test, a ticket or another tool.

Example input

{
  "log": {
    "entries": [
      {
        "startedDateTime": "2026-05-17T12:00:00Z",
        "time": 480,
        "request": {
          "method": "GET",
          "url": "https://api.example.com/users"
        },
        "response": {
          "status": 200
        }
      },
      {
        "startedDateTime": "2026-05-17T12:00:00.100Z",
        "time": 1250,
        "request": {
          "method": "POST",
          "url": "https://api.example.com/orders"
        },
        "response": {
          "status": 500
        }
      },
      {
        "startedDateTime": "2026-05-17T12:00:00.200Z",
        "time": 90,
        "request": {
          "method": "GET",
          "url": "https://cdn.example.com/app.js"
        },
        "response": {
          "status": 0
        }
      }
    ]
  }
}

Check the result

  • HAR files may contain cookies, authorization headers, and customer data; redact before sharing.
  • A HAR export only shows what the browser observed, so backend spans and queue delays may require logs or tracing too.

Practical developer examples

Find a failing API call

Compare the listed request statuses and durations to separate the visible frontend error from the network request that caused it.

Prepare a safe escalation

Extract only the relevant method, URL shape, timing and status after removing cookies, authorization Headers and customer data.

Common developer use cases

HAR files can contain cookies, Tokens, query values and response bodies. Analyze and redact them locally before sharing any capture with another person or system.

Common issues

HAR files may contain cookies, authorization headers, and customer data; redact before sharing.
A HAR export only shows what the browser observed, so backend spans and queue delays may require logs or tracing too.

FAQ

Does HAR File Analyzer send data to a server?

The interactive transformation is handled in the browser in this frontend build. Analytics and advertising scripts may still load separately for site measurement or ads readiness, so avoid pasting active secrets or regulated personal data.

What input works best in har file analyzer?

Paste raw HAR network exports directly into the input area or use the example button for a quick starting point.

Can I share HAR File Analyzer output with teammates?

Yes, but review the result first and redact tokens, private keys, customer data, internal URLs, account IDs, and other sensitive values before sending it in a ticket, chat, or pull request.