HAR Viewer

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Open a DevTools HAR export and explore every request with a waterfall, timings, headers, bodies and filters.

HAR file

Export from DevTools → Network → ⤓ Export HAR, then open it here. HAR files contain cookies and tokens: they never leave your browser.

{
  "log": {
    "version": "1.2",
    "creator": {
      "name": "FlowingDev sample",
      "version": "1.0"
    },
    "entries": [
      {
        "startedDateTime": "2026-01-01T10:00:00.000Z",
        "time": 320,
        "request": {
          "method": "GET",
          "url": "https://example.com/",
          "headers": [
            {
              "name": "Accept",
              "value": "text/html"
            }
          ],
          "queryString": []
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "h2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "text/html"
            }
          ],
          "content": {
            "size": 18432,
            "mimeType": "text/html",
            "text": "<!doctype html><title>Hi</title>"
          }
        },
        "timings": {
          "blocked": 2,
          "dns": 24,
          "connect": 40,
          "ssl": 32,
          "send": 1,
          "wait": 190,
          "receive": 31
        }
      },
      {
        "startedDateTime": "2026-01-01T10:00:00.340Z",
        "time": 120,
        "request": {
          "method": "GET",
          "url": "https://cdn.example.com/app.js",
          "headers": [],
          "queryString": []
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "headers": [],
          "content": {
            "size": 98211,
            "mimeType": "application/javascript"
          }
        },
        "timings": {
          "blocked": 1,
          "dns": 18,
          "connect": 22,
          "ssl": 20,
          "send": 0,
          "wait": 40,
          "receive": 19
        }
      },
      {
        "startedDateTime": "2026-01-01T10:00:00.350Z",
        "time": 60,
        "request": {
          "method": "GET",
          "url": "https://cdn.example.com/styles.css",
          "headers": [],
          "queryString": []
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "headers": [],
          "content": {
            "size": 21044,
            "mimeType": "text/css"
          }
        },
        "timings": {
          "blocked": 3,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 45,
          "receive": 12
        }
      },
      {
        "startedDateTime": "2026-01-01T10:00:00.480Z",
        "time": 410,
        "request": {
          "method": "POST",
          "url": "https://api.example.com/v1/login?next=%2Fhome",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ],
          "queryString": [
            {
              "name": "next",
              "value": "/home"
            }
          ],
          "postData": {
            "mimeType": "application/json",
            "text": "{\"user\":\"ada\"}"
          }
        },
        "response": {
          "status": 401,
          "statusText": "Unauthorized",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ],
          "content": {
            "size": 42,
            "mimeType": "application/json",
            "text": "{\"error\":\"invalid_credentials\"}"
          }
        },
        "timings": {
          "blocked": 1,
          "dns": 30,
          "connect": 35,
          "ssl": 30,
          "send": 2,
          "wait": 300,
          "receive": 12
        }
      },
      {
        "startedDateTime": "2026-01-01T10:00:00.520Z",
        "time": 85,
        "request": {
          "method": "GET",
          "url": "https://cdn.example.com/logo.webp",
          "headers": [],
          "queryString": []
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "headers": [],
          "content": {
            "size": 8120,
            "mimeType": "image/webp"
          }
        },
        "timings": {
          "blocked": 5,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 60,
          "receive": 20
        }
      }
    ]
  }
}

Requests

890 ms

Total time

142.4 KB

Content size

0 B

Transferred

Errors

Hosts

Requests (5)

blockeddnsconnectsslsendwaitreceive

Slowest requests

410 msPOST https://api.example.com/v1/login?next=%2Fhome

320 msGET https://example.com/

120 msGET https://cdn.example.com/app.js

85 msGET https://cdn.example.com/logo.webp

60 msGET https://cdn.example.com/styles.css

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