typing.js

A simple and intuitive JSON schema validation library for JavaScript.

Usage:

typing.check(<type-definition>, <data>);

Example:

// import module
var typing = require('typing');

// import the built-in types
var int = typing.int;
var str = typing.str;
...
var tuple = typing.tuple;
var table = typing.table;

Define custom type with built-in types

// int(1): integer >= 1;
// str(1,50): string with length between 1 to 50;
// tuple: array with specified type and number of elements
var t_employee = tuple(int(1), str(1,50), tuple(str,str));

// matched
assert(typing.check(t_employee, [123, 'todd', ['1355-0011-107', 'CA 5607']]));

// not matched, id must be >= 1
assert(false == typing.check(t_employee, [0, 'todd', ['1355-0011-107', 'CA 5607']]));

Define custom type in JSON

// typing will do pattern matching based the type defined in JSON
// nullable : null or the wrapped type
// table: equivalent of array(tuple)
var t_response = {
    status : {
        code : int,
        message : str
    },
    data : nullable(table(int(1), str(1,50), tuple(str,str)))
};

// matched
assert(typing.check(t_response, {
    status : { 
        code : 200, 
        message : 'OK'
    },
    data : [
        [1, 'Todd', ['1355-0011-107', 'CA 5607']],
        [2, 'April', ['1582-0011-108', 'CA 5607']],
        [3, 'Rex', ['1522-1011-138', 'CA 1008']]
    ]
});

// matched
assert(typing.check(t_response, {
    status : { 
        code : 404, 
        message : 'NOT FOUND'
    }
});

// not matched, status.message is missing
assert(typing.check(t_response, {
    status : {
        code : 300
    }
});