Sails Medium RequiredParam https://medium.com/p/368d1713a82f

requiredParam.js

module.exports = (params) => {
  return (req, res, next) => {
    if (params === "username" && !req.param("username")) {
      return res.status(400).send({
          code: 1,
          message: `'username' parameter is needed`
      })
    }
    return next()    
  }
}