Node.js: maximum call stack size exceeded

In the on('data') event you have:

        response.on('data', function (chunk) {
            body += chunk;
            this.emit("data", chunk);
        });

vs.

    profileEmitter = this;
    // ... code omitted 

        //Read the data
        response.on('data', function (chunk) {
            body += chunk;
            profileEmitter.emit("data", chunk);
        });

Inside the 'data' event handler this isn't the same thing as this outside it. Outside this refers to the Profile object (which you have inheriting from EventEmitter) However inside, according to the documentation "It is important to keep in mind that when an ordinary listener function is called by the EventEmitter, the standard this keyword is intentionally set to reference the EventEmitter to which the listener is attached." That listener isn't attached to the profile, it's attached to the response. By emitting another 'data' event to itself inside it's own handler your causing an infinite recursion.