How much javascript iui s needed to become a front end web developer?

Answer 1

Depends on what website you can build.

Answer 2

Edward Jackson Jr as Gordon was saying in reality is the more you know the better but at the same time on some web projects it may be a few lines to many many layers. No one size fits all and as Mirielle pointed out there are times when other languages such as Python may be used instead, thus again next to zero JavaScript required.