js-datatype-stream.js

// Create a stream for JSON values
session.stream("foo").asType(jsonType).on({
    value : function(topic, specification, newValue, oldValue) {
      // Receive the new value of a topic, along with the previous value
    },
    subscribe : function(topic, specification) {
      // Notification of subscription
    },
    unsubscribe : function(topic, specification, reason) {
      // Notification of unsubscription
    }
});

// Subscribe to the topic
session.subscribe("foo");