Legitimize

Legitimize is a simple and flexible object validator. It can be useful for validating JSON objects or to simply ensure an options parameter contains valid values.

Install

npm install legitimize

Quick Start

It is relatively simple to use legitimize. Simply require the module, create a scheme and it's returned value will be the validation function. You may also pass a second parameter that is an object of default property rules.

var Legitimize = require("legitimize");

var defaults = {
    type: "string"
};

var validate = new Legitimize({
    name: {
        required: true,
        pattern: /[a-z]+/i
    },
    town: {
        required: true
    },
    age: {
        type: "integer",
        error: "'age' must be an integer that is between 0 and 120",
        use: function(value) { return (value >= 0 && value <= 120); }
    },
    color: {
        within: ["red", "green", "blue"]
    }
}, defaults);

This example object will return an error on many accounts but will return the first error it has encounted. 'town' should be a string, 'age' should be an integer that's between 0 and 120, and lastly color is a string (from the default rules object) but is not either 'red', 'green', or 'blue'.

var invalid = validate({
    name: "Lewis Barnes",
    town: 5,
    age: "four hundred",
    color: "myColour"
});

// returns 'town' must have a data type of string
console.log(invalid);

This object is a revised copy of the previous example with changes made to the town, age, and color properties. Since there are no errors, it returns null.

var invalid = validate({
    name: "Lewis Barnes",
    town: "Manchester",
    age: 20,
    color: "blue"
});

// returns null
console.log(invalid); 

Supported Property Rules

• required - If true, the property must be present within the object.
• type - Defines the data type of the property. For information see 'Supported Data Types'.
• pattern - Tests the value against a regular expression pattern.
• within - Searches an array of items for the property value.
• use - Allows custom validation via a function. This function is passed a single parameter that is the value of the property. The returned value of the function will dictate if the value is valid.

Supported Data Types

• string
• number
• object
• array
• boolean
• function
• regex
• path
• decimal
• integer

Future Improvements

• Add comments to the code.
• Make use of a testing framework.
• Revise README 'Supported Data Types' to demonstrate examples of the data type.

Changelog

Licence

Copyright (c) 2014 Lewis Barnes. See LICENSE for details.