What is the HAR file format supported by Internet Explorer’s and Edge’s F12 developer tools?

In web development, the browser F12 development tools are nowadays imperative, and it's difficult to d developing web applications without them anymore. However, there's one useful feature that you might not have noticed yet: the ability to export a browsing session to a single file.

If you open the F12 tools in Edge or Internet Explorer (IE) and go to the Network tab, you have the option to save the details shown. When you click the save button on the toolbar, you can export the data as a so-called HAR file.

What is a HAR file? The name is short for "HTTP Archive", and it's by default a JSON file that contains all the requests made in the session, along with their replies and body content in a single file. This is very useful for both debugging and automated testing.

Hope this helps!