whole_func_string: function userFromToken(req, cb) {
    const { accessToken } = req;
  
    app.models.zlUser.findById(accessToken.userId, (err, usr) => {
      if (!err && usr) {
        cb(null, usr);
      }
      else cb(err);
    });
  }
func_code_string: function userFromToken(req, cb) {
    const { accessToken } = req;
  
    app.models.zlUser.findById(accessToken.userId, (err, usr) => {
      if (!err && usr) {
        cb(null, usr);
      }
      else cb(err);
    });
  }
func_documentation_string: Get user detail from accessToken