HAR Viewer — Open & Analyze .har Captures

HAR JSON2942 chars

{
  "log": {
    "version": "1.2",
    "creator": {
      "name": "Anvil HAR Viewer",
      "version": "1.0"
    },
    "entries": [
      {
        "startedDateTime": "2026-06-18T10:00:00.000Z",
        "time": 142.7,
        "request": {
          "method": "GET",
          "url": "https://api.example.com/v1/users?page=1",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Accept",
              "value": "application/json"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0"
            }
          ],
          "queryString": [
            {
              "name": "page",
              "value": "1"
            }
          ],
          "cookies": [],
          "headersSize": 218,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            },
            {
              "name": "Cache-Control",
              "value": "max-age=60"
            }
          ],
          "cookies": [],
          "content": {
            "size": 1487,
            "mimeType": "application/json"
          },
          "redirectURL": "",
          "headersSize": 196,
          "bodySize": 1487
        },
        "cache": {},
        "timings": {
          "blocked": 1.2,
          "dns": 4.5,
          "connect": 18.3,
          "send": 0.4,
          "wait": 110.6,
          "receive": 7.7
        }
      },
      {
        "startedDateTime": "2026-06-18T10:00:00.310Z",
        "time": 88.1,
        "request": {
          "method": "POST",
          "url": "https://api.example.com/v1/auth/login",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ],
          "queryString": [],
          "cookies": [],
          "postData": {
            "mimeType": "application/json",
            "text": "{\"email\":\"user@example.com\"}"
          },
          "headersSize": 154,
          "bodySize": 28
        },
        "response": {
          "status": 401,
          "statusText": "Unauthorized",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ],
          "cookies": [],
          "content": {
            "size": 52,
            "mimeType": "application/json"
          },
          "redirectURL": "",
          "headersSize": 132,
          "bodySize": 52
        },
        "cache": {},
        "timings": {
          "blocked": 0.6,
          "dns": 0,
          "connect": 0,
          "send": 0.3,
          "wait": 84.9,
          "receive": 2.3
        }
      }
    ]
  }
}

Requests2

About HAR Viewer — Open & Analyze .har Captures

A HAR file (HTTP Archive) is the JSON capture your browser exports when you "Save all as HAR" from the Network panel. It records every request a page made — the method, URL, status, timing, sizes, and headers. It's the standard way to share a network trace when debugging a slow page or a failing API call.

This free HAR viewer opens that capture offline and lets you browse it like a mini DevTools: a master list of every request with color-coded status, plus a detail panel for the selected request's headers. It's the fastest way to open a .har file without re-uploading a trace that may contain cookies or tokens.

Everything runs in your browser. Your HAR is parsed locally and never leaves your device.

Features

Master request list with method, color-coded status, URL, size, and timing
Click any request to inspect its request and response headers
Summary bar with total request count, transfer size, and time
Fully offline — your HAR capture is never uploaded

How to use

Export a HAR from your browser DevTools (Network panel → Save all as HAR).
Paste the HAR JSON into the input box.
Browse the request list — status colors flag 4xx/5xx at a glance.
Click a request to expand its request and response headers.

Frequently asked questions

What is a HAR file?

A HAR (HTTP Archive) file is a JSON-formatted log of a browser session’s network activity — every request, response, header, timing, and size. Browsers and tools like Charles or Fiddler can export one for debugging or sharing.

Is it safe to open a HAR file here?

Yes. The HAR is parsed entirely in your browser with JavaScript — nothing is sent to a server. That matters because HAR captures often contain cookies, auth tokens, and request bodies you would not want to upload.

How do I create a HAR file?

Open your browser DevTools, go to the Network tab, reproduce the activity, then right-click the request list and choose "Save all as HAR" (Chrome/Edge) or use the download icon (Firefox).

Why are some requests highlighted in different colors?

Status codes are color-coded: 2xx success is green, 3xx redirects are blue, 4xx client errors are amber, and 5xx server errors are red — so problem requests stand out instantly.

Related tools

Everything runs locally in your browser — your input is never uploaded.