The messages object

messages: { // or by html attribute 'data-message-error'
  required: 'Required field',
  email: 'Invalid email',
  integer: 'Needs to be a integer',
  digit: 'Only letters and numbers',
  numeric: 'Only  numbers',
  pattern: 'Needs to matchs pattern',
  phone: 'Invalid phone number',
  url: 'Invalid url',
  date: 'Invalid date',
  currency: 'Invalid currency',
  cep: 'Invalid cep',
  maxLength: 'The amount of characters is greater than allowed',
  minLength: 'The amount of characters is less than allowed',
  rangeLength: 'The number of characters must be between 3 and 5',
  sameLength: 'The value needs to have 5 characters',
  max: 'The value needs to be less or equals to 5',
  min: 'The value needs to be greater or equals to 3',
  range: 'The value needs to be between 3 and 5',
  equalTo: 'The value needs to be 10',
  cpf: 'Invalid cpf',
  cnpj: 'Invalid cnpj',
  cnh: 'Invalid cnh',
  creditCard: 'Invalid credit card number',
  hasExtension: 'Invalid extension detected'
}

Error messages by html attribute

It's possible to set up error messages by the html attribute 'data-message-error', that will overwrite the message configured in messages object. This aproach is not good when the field has more then one validation rule.

Example:

<div>
  <input type='text' class='required' data-message-error='Required field.'>
</div>