Pretty-print a minified file

This page describes the JavaScript Debugger as it appears in Firefox 52 and above. To see what it's like in earlier versions of Firefox, see Debugger (before Firefox 52).

If you're using Firefox 52 or later and need to switch back to the old Debugger, you can do so by visiting about:config and setting the "devtools.debugger.new-debugger-frontend" preference to false.

To prettify a minified file, click this icon:  in the source pane. The debugger will format the source and display it as a new file with a name like: "[original-name]:formatted".

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 Contributors to this page: wbamberg
 Last updated by: wbamberg,