HAR Viewer

Open or paste a .har file from your browser's network panel to see a waterfall, filter and sort requests, inspect headers, cookies and bodies, and export a sanitized copy.

Drop a .har file here or click to choose. A sample capture is loaded.

HAR JSON

{
  "log": {
    "version": "1.2",
    "creator": {
      "name": "Firefox",
      "version": "131.0"
    },
    "pages": [
      {
        "startedDateTime": "2026-09-24T09:30:00.000Z",
        "id": "page_1",
        "title": "Shop",
        "pageTimings": {
          "onContentLoad": 480,
          "onLoad": 1320
        }
      }
    ],
    "entries": [
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.000Z",
        "time": 146,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            }
          ],
          "queryString": [],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "text/html; charset=utf-8"
            },
            {
              "name": "Content-Length",
              "value": "18420"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 18420,
            "mimeType": "text/html; charset=utf-8",
            "text": "<!doctype html><html><head><title>Shop</title></head><body>…</body></html>"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 18420
        },
        "cache": {},
        "timings": {
          "blocked": 2,
          "dns": 14,
          "connect": 22,
          "ssl": 18,
          "send": 0,
          "wait": 96,
          "receive": 12
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.170Z",
        "time": 59,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/assets/app.css",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            }
          ],
          "queryString": [],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "text/css"
            },
            {
              "name": "Content-Length",
              "value": "42310"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 42310,
            "mimeType": "text/css"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 42310
        },
        "cache": {},
        "timings": {
          "blocked": 1,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 38,
          "receive": 20
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.172Z",
        "time": 133,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/assets/app.js",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            }
          ],
          "queryString": [],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/javascript"
            },
            {
              "name": "Content-Length",
              "value": "184200"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 184200,
            "mimeType": "application/javascript"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 184200
        },
        "cache": {},
        "timings": {
          "blocked": 1,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 44,
          "receive": 88
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.180Z",
        "time": 101,
        "request": {
          "method": "GET",
          "url": "https://fonts.example.net/inter.woff2",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "fonts.example.net"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            }
          ],
          "queryString": [],
          "cookies": [],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "font/woff2"
            },
            {
              "name": "Content-Length",
              "value": "48100"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 48100,
            "mimeType": "font/woff2"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 48100
        },
        "cache": {},
        "timings": {
          "blocked": 3,
          "dns": 18,
          "connect": 24,
          "ssl": 20,
          "send": 0,
          "wait": 30,
          "receive": 26
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.200Z",
        "time": 118,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/img/hero.avif",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            }
          ],
          "queryString": [],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "image/avif"
            },
            {
              "name": "Content-Length",
              "value": "96400"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 96400,
            "mimeType": "image/avif"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 96400
        },
        "cache": {},
        "timings": {
          "blocked": 2,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 52,
          "receive": 64
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.310Z",
        "time": 219,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/api/products?category=shoes&page=1",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "application/json"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            },
            {
              "name": "Authorization",
              "value": "Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiI0MiJ9.sig"
            }
          ],
          "queryString": [
            {
              "name": "category",
              "value": "shoes"
            },
            {
              "name": "page",
              "value": "1"
            }
          ],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            },
            {
              "name": "Content-Length",
              "value": "6120"
            },
            {
              "name": "Cache-Control",
              "value": "no-store"
            }
          ],
          "cookies": [],
          "content": {
            "size": 6120,
            "mimeType": "application/json",
            "text": "{\"items\":[{\"id\":\"sneaker-42\",\"price\":89}],\"page\":1}"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 6120
        },
        "cache": {},
        "timings": {
          "blocked": 1,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 210,
          "receive": 8
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.540Z",
        "time": 135,
        "request": {
          "method": "POST",
          "url": "https://shop.example.com/api/cart",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "application/json"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            },
            {
              "name": "Authorization",
              "value": "Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiI0MiJ9.sig"
            }
          ],
          "queryString": [],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 38,
          "postData": {
            "mimeType": "application/json",
            "text": "{\"product\":\"sneaker-42\",\"quantity\":1}"
          }
        },
        "response": {
          "status": 201,
          "statusText": "Created",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            },
            {
              "name": "Content-Length",
              "value": "512"
            },
            {
              "name": "Cache-Control",
              "value": "no-store"
            },
            {
              "name": "Set-Cookie",
              "value": "cart=c-7781; Path=/; HttpOnly; Secure"
            }
          ],
          "cookies": [],
          "content": {
            "size": 512,
            "mimeType": "application/json",
            "text": "{\"id\":\"c-7781\",\"items\":1}"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 512
        },
        "cache": {},
        "timings": {
          "blocked": 1,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 132,
          "receive": 2
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.560Z",
        "time": 642,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/api/recommendations?user=42",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "application/json"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            },
            {
              "name": "Authorization",
              "value": "Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiI0MiJ9.sig"
            }
          ],
          "queryString": [
            {
              "name": "user",
              "value": "42"
            }
          ],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 500,
          "statusText": "Internal Server Error",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/json"
            },
            {
              "name": "Content-Length",
              "value": "184"
            },
            {
              "name": "Cache-Control",
              "value": "no-store"
            }
          ],
          "cookies": [],
          "content": {
            "size": 184,
            "mimeType": "application/json",
            "text": "{\"error\":\"upstream timeout\"}"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 184
        },
        "cache": {},
        "timings": {
          "blocked": 1,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 640,
          "receive": 1
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.330Z",
        "time": 96,
        "request": {
          "method": "GET",
          "url": "https://cdn.example.org/analytics.js",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "cdn.example.org"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            }
          ],
          "queryString": [],
          "cookies": [],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 304,
          "statusText": "Not Modified",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "application/javascript"
            },
            {
              "name": "Content-Length",
              "value": "0"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 0,
            "mimeType": "application/javascript"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 0
        },
        "cache": {},
        "timings": {
          "blocked": 4,
          "dns": 22,
          "connect": 30,
          "ssl": 26,
          "send": 0,
          "wait": 40,
          "receive": 0
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.420Z",
        "time": 28,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/img/missing.png",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            }
          ],
          "queryString": [],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 404,
          "statusText": "Not Found",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "text/html"
            },
            {
              "name": "Content-Length",
              "value": "1240"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 1240,
            "mimeType": "text/html",
            "text": "<!doctype html><html><head><title>Shop</title></head><body>…</body></html>"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 1240
        },
        "cache": {},
        "timings": {
          "blocked": 1,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 24,
          "receive": 3
        }
      },
      {
        "pageref": "page_1",
        "startedDateTime": "2026-09-24T09:30:00.460Z",
        "time": 21,
        "request": {
          "method": "GET",
          "url": "https://shop.example.com/favicon.ico",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Host",
              "value": "shop.example.com"
            },
            {
              "name": "User-Agent",
              "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 14_6) Firefox/131.0"
            },
            {
              "name": "Accept",
              "value": "*/*"
            },
            {
              "name": "Cookie",
              "value": "session=9f2c1ab7e4; theme=dark"
            }
          ],
          "queryString": [],
          "cookies": [
            {
              "name": "session",
              "value": "9f2c1ab7e4"
            },
            {
              "name": "theme",
              "value": "dark"
            }
          ],
          "headersSize": -1,
          "bodySize": 0
        },
        "response": {
          "status": 200,
          "statusText": "OK",
          "httpVersion": "HTTP/2",
          "headers": [
            {
              "name": "Content-Type",
              "value": "image/x-icon"
            },
            {
              "name": "Content-Length",
              "value": "4286"
            },
            {
              "name": "Cache-Control",
              "value": "public, max-age=31536000"
            }
          ],
          "cookies": [],
          "content": {
            "size": 4286,
            "mimeType": "image/x-icon"
          },
          "redirectURL": "",
          "headersSize": -1,
          "bodySize": 4286
        },
        "cache": {},
        "timings": {
          "blocked": 1,
          "dns": 0,
          "connect": 0,
          "ssl": 0,
          "send": 0,
          "wait": 18,
          "receive": 2
        }
      }
    ]
  }
}

HAR files often contain cookies, session tokens and Authorization headers. Everything stays in your browser. Share only the sanitized export, which strips Authorization, Cookie and Set-Cookie headers and cookie lists.

WaterfallblockedDNSconnectTLSwaitreceive

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