Express Validator Suger

express-validator-sugar.coffee

# Implementation
pre = (fn, error_handler, great) ->
	fn()
	errors = req.validationErrors()
	if errors
		v(errors) for k,v of error_handler
	else
		v() for k,v of great

# Result
pre ->
	req.assert('postparam', 'Invalid postparam').notEmpty().isInt()
	req.assert('getparam', 'Invalid getparam').isInt()
	req.assert('urlparam', 'Invalid urlparam').isAlpha()
, error: (errors) ->
	res.json errors
, great: ->
	# Continue as usual

// Compare it to this:

req.assert('postparam', 'Invalid postparam').notEmpty().isInt();
  req.assert('getparam', 'Invalid getparam').isInt();
  req.assert('urlparam', 'Invalid urlparam').isAlpha();

  req.sanitize('postparam').toBoolean();

  var errors = req.validationErrors();
  if (errors) {
    res.send('There have been validation errors: ' + util.inspect(errors), 500);
    return;
  }