Creating a HAR file to output browser traffic for diagnostics

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  • How to create a HAR file to output browser traffic for diagnostics?


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The HTTP Archive format or HAR, is a JSON-formatted archive file format for logging of a web browser's interaction with a site. The common extension for these files is .har.

The specification for the HTTP Archive (HAR) format defines an archival format for HTTP transactions that can be used by a web browser to export detailed performance data about web pages it loads. The specification for this format is produced by the Web Performance Working Group of the World Wide Web Consortium (W3C). The specification is in draft form and is a work in progress.

Some of the browsers that support HAR are:

  • Mozilla Firefox
  • Google Chrome
  • Microsoft Edge
  • Internet Explorer 9

Instructions to acquire a HAR file depend on web browser. Refer to its official documentation.

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