npm install errorlet

var errorlet = require('errorlet');

// make a custom error and throw it.
throw errorlet.create({error: 'http_error:not_found', message: 'this is the custom error message', httpCode: 404});

// you can directly raise it as well instead of using throw.
// the stack will be the same as if you call throw.
errorlet.raise({error: 'error_code', message: 'this is the custom error message'});

// you can also do it in async fashion.
// the stack will be the same as if you call throw.
errorlet.raiseAsync({error: 'async_error', message: 'you should see this error in the callback'}, function (err) {
  console.log(err);
});