To check js syntax:
To share your code, You must only click on "SHARE fiddle" button (And choice a password)!
This linter allows to report stylistic errors, it can improve the quality of the code. It can also signal suspicious constructs, avoid mistakes, and potentially dangerous things.
This tool uses JSHint library.
You just have to share the URL of your fiddle in order to share it. Your JS fiddle will be accessible to everyone, do not save sensitive data! The password is only used to protect its modification.