How to execute a certain JavaScript command only in the homepage of a website?

I wish to execute a certain JavaScript command only in the homepage of a website or in any webpage redirected from it.

The problem is that often times the URLs of homepages are more than sheer example.com or www.example.com due to dynamic URLs such as example.com/pid-1 or example.com/pid/1.

How would you prefer to achieve that?

Only put the JS in the home page.

But if its not a website I own, what is the way to select only the homepage if there isn’t a selector such as a CSS class or a CSS ID just for the homepage?

If it is not your website, how can you change the files of it?

I don’t want to change these; I seek to run a script when using it, for personal convenience purpose.

The easiest way to do that is through something like Greasemonkey.

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