Only 15% of all programs linted on this website pass the JSHint checks. In all other cases, JSHint finds some red flags that could've been bugs or potential problems.
Please note, that while static code analysis tools can spot many different kind of mistakes, it can't detect if your program is correct, fast or has memory leaks. You should always combine tools like JSHint with unit and functional tests as well as with code reviews.
Engineers from these companies and projects use JSHint:
And many more!