How to validate against a simple JSON schema.

json-schema-validation.js

var x = {
    a: String,
    b: [String],
    c: Number,
    d: Boolean,
    e: Object

};

if (!Array.isArray) {
    Array.isArray = function(arg) {
        return Object.prototype.toString.call(arg) === '[object Array]';
    };
}

var log = console.log;

var subValidationSelector = function(item, callback) {
        if (Array.isArray(item)) {
            log('item ' + item + ' is an array.');
        } else {
            switch (item) {
            case String:
                log('item is string');
                break;
            case Number:
                log('item is number');
                break;
            case Boolean:
                log('item is boolean');
                break;
            case Object:
                log('item is object');
                break;
            default:
                log('DUNNO!');
                break;
            }
        }
    };

var props = Object.getOwnPropertyNames(x);

log('props: ' + JSON.stringify(props));

for (var p in x) {
    subValidationSelector(x[p]);
}