validation

A validator for HTTP request parameters.

Installation

npm i @killara/validation -S

Features

• It supports three kinds of rule declarations. String inline rules, object rules and array rules.
• It supports async validation rule. For example, unique validation for only specific record in database table.
• It supports custom rules
• It supports custom error messages, or it uses default messages.

Usage

const Validation = require('@killara/validation');
const validation = new Validation();

const values = {
  username: 'admins',
  password: 'abcdef',
  sex: 'male',
};

const rules = {
  username: 'required|alpha:6',
  password: {
    required: true,
    regexp: /^[a-z]{6,18}$/,
  },
  sex: [ 'male', 'female' ],
};

const messages = {
  'username.alpha': 'The field must be entirely alphabetic characters with the length of ${len}'
  'sex.in': 'The field should be included in the list of ${ _items_.join(", ") }'
};

const errors = await validation.validate(values, rules, messages);

if (!errors) {
  // all validations passed
} else {
  // we got an array of errors
}

Rule

• accepted

  • string style: field: 'accepted'
  • object style: field: { accepted: true }

• alpha

  • string style: field: 'alpha:6' or field: 'alpha:len=6'
  • object style: field: { alpha: { len: 6 } }

• alphanum

  • string style: field: 'alphanum:6' or field: 'alphanum:len=6'
  • object style: field: { alphanum: { len: 6 } }

• confirmed

  Rule confirmed: the field need to have the same value as the value that be filled by field_confirmed. We can change field_confirmed to any names with confirmed:"custom"

  • string style: field: 'confirmed' or field: 'confirmed"custom_field_name"'
  • object style: field: { confirmed: { len: 6 } }

• date

  • string style: field: 'date'
  • object style: field: { date: true }

• datetime

  • string style: field: 'datetime'
  • object style: field: { datetime: true }

• time

  • string style: field: 'time'
  • object style: field: { time: true }

• email

  • string style: field: 'email:true'
  • object style: field: { email: true }

• in

  • array style: field: [ 'basketball', 'football' ]
  • object style: field: { in: [ 'basketball', 'football' ] }

• money

  • string style: field: 'money' or field: 'money:0' field: 'money:2' (default)
  • object style: field: { money: { decimal: true } } or field: { money: { decimal: 0 } } or field: { money: { decimal: 2 } }

• numeric

  • string style: field: 'numeric:6' or field: 'numeric:len=6'
  • object style: field: { numeric: { len: 6 } }

• regexp

  • string style: field: 'regexp:"^123456$"'
  • object style: field: { regexp: new RegExp(/abc/, 'i') } or field: { regexp: /^[0-9a-zA-z]{8,16}$/ }

• required

  • string style: field: 'required' or field: 'required:true'
  • object style: field: { required: true }

API

• #constructor(options?: object)
  • Initialize with options (cant include options properties)
• #async validate(params: object, rules?: object, messages?: object)
  • Validate params
• #addRule(name: string, ruleFunc: ruleFunc: (field: string) => (context: object) => (params: object) => bool)
  • Add custom rule
• #addMessage(name: string, message: string)
  • Add custom message

License

MIT