Parse nested json data and retrieve value of the given key.

parse_json.js

var jsondata = {
	'name': {
		'fname': 'Jack',
		'lname': [
                    {'familyName': 'Sparrow'},
                    {'surname': 'Captain'},
                    {'tags':[
                        {'test': 'mocha'},
                        'program', 
                        {'level': 'five',}
                    ]}
                ]
	}
};

var result = get_value_nested(jsondata, 'test');
console.log(result);

function get_value_nested(dataObject, keyName) {
    var value = null;
    this.get_value = function (dataObject, keyName) {
        for (i in dataObject) {
            if (i == keyName) {
                value = dataObject[keyName];
            } else if (typeof dataObject[i] == 'object') {
    			 this.get_value(dataObject[i], keyName);
    		}
    	}
        return value;
    }
    
    this.get_value(dataObject, keyName);

    return value;
}