What is a .HAR file?
HAR records a browser session’s network requests for debugging. Saved by browser developer tools.
- Did you know
- The HAR format was developed around 2007 to share web-performance traces between tools. (approximate)
- The HAR format grew out of a collaboration between the makers of Firebug and HttpWatch to standardise a JSON log of browser network activity.
- A draft to formalise HAR through the W3C Web Performance Working Group was submitted but never ratified, so the community 1.2 specification remains the reference.
- What Analyser shows you
- Open and read structured developer data files: Jupyter notebooks (IPYNB) rendered cell by cell with their markdown, code and captured outputs (text and images); HAR network captures shown as a request table with status, type, size and timing; and the JSON supersets JSON5, JSONC and Hjson shown as selectable source with an expandable value tree.
- Open a .HAR file
- Drag a .HAR file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
- Related formats
- .IPYNB · .JSON5 · .JSONC · .Hjson. See all supported file types.