json-validator

This is a simple to use json data model validate kit for NodeJS.

In every NodeJS App, we have to receive data from Clients, which is represented in JSON format. Unlike a Relational Database, JSON doesn't have a schema, and the data from client can be arbitrary, so we have to validate use input on the server.

There are some alternatives to this kind of scenario:

• validator.js
• jsonschema

but not as easy as I expected, so here comes this Repo.

Install

npm install json-valid

Usage

var Validator = require('json-valid');

Define a model

var model = {
   username: 'string',
   avatar: 'url',
   age: 'number',
   is_vip: 'bool',
   created_at: 'date'
}

var validator = new Validator(model);
validator.validate(data);	// return a Array of error

More Options

var model = {
  username: 'string',
  slogan: 'string?',		// ? means optional
  age: 'number:[12,18)',	// 12 <= age < 18
  email: 'email',
  phone: 'string:1\\d{10}',	// use your own pattern, Chinese's cell phone number starts with 1, and other 10 digit
  description: 'string?:0,200' // optional, if exists 0 <= description.length <= 200
}

Nested

Validator.define('User', {
  username: 'string',
  avatar: 'url',
  is_vip: 'bool'
});

Validator.define('Comment', {
  comment_id: 'number',
  content: 'string',
  author: 'User'
});

var model = {
  artical_id: 'number',
  content: 'string',
  creator: 'User',
  comments: 'array:Comment'
}

var validator = new Validator(model);
var errors = validator.validate({
  artical_id: 1234,
  content: "This is a article",
  creator: {
    username: 'Ricky',
    avatar: 'http://www.google.com/doodle.png',
    is_vip: 1		// This is a error!
  },
  comments: [{
	comment_id: '2344',		// This is a error!
  	author: {
	  username: 'Hi',
	}
  }]
});

console.log(errors);

And here is the output from above:

[ { [Error: Data field creator.is_vip type error] code: 1000, dataField: 'creator.is_vip', value: 1 },
  { [Error: Data field comments.0.comment_id type error] code: 1000, dataField: 'comments.0.comment_id', value: '2344' },
  { [Error: Data field comments.0.content doesn't exist] code: 1002, dataField: 'comments.0.content' },
  { [Error: Data field comments.0.author.avatar doesn't exist] code: 1002, dataField: 'comments.0.author.avatar' },
  { [Error: Data field comments.0.author.is_vip doesn't exist] code: 1002, dataField: 'comments.0.author.is_vip' } ]

Supported Types

• string: you can limit the length with 'field': 'string:6,20' (A common password length limit), or provide your own RegExp with 'field': 'string:a\\d+' (Need escape! This is equal to /a\d+/g)
• number: you can limit the min and max value with 'field': 'number:[10,20)' (A square bracket means include, and parentheses mean exclude, just like what you do in Math)
• bool
• url
• date: Any valid date string is supported
• email
• array: you can sepecify the element type of array with 'array-field': 'array:YourType', and define your type with Validator.define('YourType', model), can be nested! If element type not provided, any array will pass the test.

Add your own type

Fork this Repo, and add your type into validators directory.

License

MIT