Find unused Javascript functions?

Question

I have around 100 .js files in my application. I need to find the unused functions from these files.

Which editor or tool can help me?

I dont' this there is a way to do it completely. Check this question : http://stackoverflow.com/questions/1167663/is-there-a-tool-to-remove-unused-methods-in-javascript — Shoban, Jul 23 '09 at 06:58
Possible duplicate of [Is there a tool to remove unused methods in javascript?](https://stackoverflow.com/questions/1167663/is-there-a-tool-to-remove-unused-methods-in-javascript) — aug, May 15 '18 at 18:37

score 9 · Answer 1 · edited Aug 28 '15 at 00:39

9

Give a look to the JSLint code quality tool.

edited Aug 28 '15 at 00:39

JohnnyHK

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answered Jul 23 '09 at 06:10

Christian C. Salvadó

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How does JSLint need to be configured to show warnings about unused functions? – Clemens Mar 02 '22 at 00:51

score 1 · Answer 2 · edited Aug 28 '15 at 00:32

1

You can do this using Jsure, a Javascript lint implementation. You'll be looking for the -unused-funs flag

edited Aug 28 '15 at 00:32

JohnnyHK

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answered Jul 23 '09 at 06:10

score 0 · Answer 3 · answered Jun 26 '23 at 15:07

Necromancing for the sake of completeness:

On the frontend you can now use modern browsers' devtools, which now have the "Coverage" tab (at least Chromium-based do).

This tab allows you to "record" user activity for some time and then inspect which parts of JS files haven't been called/executed. Works for CSS too.

In dev tools press Ctrl + Shif + P to bring up the command bar, start typing "Cover.." and the "enable Coverage tab" will pop up. Then press "record" at the bottom area.

Find unused Javascript functions?

3 Answers3

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