Job postings also mention JavaScript more than any programming language other than Java:
What programming language should you learn first?
Quincy Larson

Sure JavaScript jobs are much more available than others (except Java).

Do they pay as well, though?

Too many job openings reeks of “coder factory”, in which coders are treated as replaceable cogs in the enterprise machine.

That’s why I recommend people wanting to actually have a _career_ (gasp!) to learn Python.

The Maths & Physics world are being recruited into the Finance industry to do data slicing & dicing. And these people are familiar with two things: MATLAB and Python. Guess which language they will insist on being used in the Finance Industry.

And, like it or not, that is where the money is.