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I'm on the process of refactoring a large JavaScript application, which has a lot of repeated functions with 2 or 3 different parameters, a lot of global variables used in several modules, etc.

Which tool do you recommend for this purpose?

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Commands like grep and awk will be of help. – Zirak Jan 19 at 1:39
More specifics on what you want to do might be helpful. JS itself is a powerful tool. One of my own personal favorites is a bookmarklet I wrote myself that just brings up all the first-party linked JS (via ajax) and inline JS up in a document in a new tab so I can control-f all the relevant code for the page in one sweep. I used to use a FireFox web dev toolbar plug-in for that but the author added color-coding with the design trade-off that non-trivial amounts of JS will crash the whole thing. And yes. Learn RegEx. Learn it well. – Erik Reppen Jan 19 at 3:15

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WebStorm by JetBrains - from the same company that makes ReSharper (a popular refactoring tool for C#). Several of their other products may also include Javascript refactoring capabilities. (They have IDEs for PHP, Python, Ruby, ...)

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