extend-error

Ever tried to create custom error types in Node.js and wished it should be this simple?

``
var MyError = Error.extend('MyError');
`

`
throw MyError('wow')
`

$3

`
npm install extend-error
`

and in your app.js, just `require('extend-error')`. It will provide you an extend() method for the Error type.

$3

`
var AppError = Error.extend('AppError', 500);
var ClientError = Error.extend('ClientError', 400);
`

extend ClientError further for specific http types

`
var HttpNotFound = ClientError.extend('HttpNotFoundError', 404);
var HttpUnauthorized = ClientError.extend('HttpUnauthorized', 401);
`

$3

`
throw new AppError('unable to connect db due to error: ' + err);

throw new ClientError({'message':'required field missing', field: 'email'})

throw new HttpNotFound('no post found with id: ' + id);

throw new HttpNotFound({'message': 'no such post', 'id': id});
`

$3

`
throw ClientError('bad request');
`

$3

throw an error in controller

`
var err = HttpNotFound('user profile not found');

throw err;
(or)
callback(err)
`

handle it easily in global error handler (in case of express.js error middleware)

`
if (err instanceof ClientError) {
//send out the actual message
res.send(err.code, err.message);
} else {
//send out a generic message
res.send(500, 'oops! something went wrong');
log.error(err);
}

``