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How to run JavaScript code line-by-line in PhpStorm or WebStorm?

I want to run my JavaScript code line by line in PhpStorm to debug it. How can I do this?

Please explain it for me.

Solution

start the JavaScript Debug session (https://confluence.jetbrains.com/display/WI/Starting+a+JavaScript+debug+session) and, once breakpoint is hit, use Step Over to run it line-by-line

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