JavaScript Error Handling Error objects


Runtime errors in JavaScript are instances of the Error object. The Error object can also be used as-is, or as the base for user-defined exceptions. It's possible to throw any type of value - for example, strings - but you're strongly encouraged to use Error or one of it's derivatives to ensure that debugging information -- such as stack traces -- is correctly preserved.

The first parameter to the Error constructor is the human-readable error message. You should try to always specify a useful error message of what went wrong, even if additional information can be found elsewhere.

try {
   throw new Error('Useful message');
} catch (error) {
   console.log('Something went wrong! ' + error.message);