Create JSON topic in JS API

twitter.js

function createTopics(session){
    console.log('Adding Topics...');
	
    session.topics.add('twitter', new diffusion.topics.TopicSpecification(diffusion.topics.TopicType.JSON)).then(
        function(result) {
            console.log('JSON Topic Added : ' + result.topic);

            // Start the updates to the topic
            startStream(session);
        },
        function(error) {
            console.log('JSON Topic Add Failed : ' + error);
        }
    );
}