Additionally, i just encountered a server issue where i couldn’t post new users. The solution i found was to replace the calls to bcrypt.genSalt(10) by bycrypt.genSaltSync(10), and bcrypt.hash(user.password, salt) by bcrypt.hashSync(user.password, salt).
The original methods have been updated and now need to be provided a callback function in parameters, but those works just as the old ones.
Edit: Also compare with compareSync