typed-schema

Define a typed schema for any object, without extra dependencies

This module allows you to set a typed schema for an object that will be enforced constantly, not only on initialization.

This is similar to Mongoose schemas.

How to use

var schema = require('typed-schema')

schema(obj, schema)

Schemas are defined as an object of specs for each property. The spec can have properties:

• type - the type to be enforced, can be "string", "number", "date", "boolean". Can also be a RegExp instance in case you want to validate against that expression. It can be "object" or "array", but keep in mind then you need to also specify schema property
• default - the default value; must comply to the type
• get - getter, cannot be used with type/default
• set - setter, cannot be used with type/default
• enumerable - whether this property will be enumerable - the default is true
• schema - applicable if you set the type to "object" or "array"; the value follows the same spec
• dynamic - enforce dynamically or only on construction, true by default, but can be false by default by setting opts.staticByDefault

Validating arrays is supported by setting the type to "array" and providing the schema property. Nested objects are supported by setting the type to "object" and providing the schema property.

Example

var schema = require('typed-schema')
 
function Person() {
    schema(this, {
        name: { type: 'string', default: 'nameless' },
        age: { type: 'number' },
        created: 'date',
        address: {
            line1: 'string',
            line2: 'string'
        },
        favNumbers: { type: 'array', schema: { type: 'number' } }, // array of numbers
        firstName: { get: function() { return this.name.split(" ")[0] } } // getter
    })
 
    return this
}
 
var p = new Person()
// p is { name: 'nameless', age: 0, created: /* date when created */, address: { line1: "", line2: "" }, favNumbers: [] }
 
p.name = 23
// p.name becomes "23", it's cast to string
 
p.created = "10/23/2004"
// p is 23 October 2004, date object
 
p.favNumbers.push(22)
p.favNumbers.push("42") // favNumbers will be [22, 42] ; the string will be cast to a number
p.favNumbers.push("forty five") // nothing happens, can't cast "forty five" to number
// p.favNumbers is [22, 42]
 
p.name = "John Smith"
// p.firstName is "John", thanks to the getter