azureFunction.js

module.exports = function (context, req) {
    context.log('JavaScript HTTP trigger function processed a request.');

    /*
    This function simply returns messages as a JSON in response to any request
    Definitely not what you would want to have in a production environment, but will suffice for the demo
    Note the content-type header for 'application/json'
    */
    context.res = {
        // status: 200, /* Defaults to 200 */
        body: {"messages": [
            {"id":1,"content":"Hello"},
            {"id":2,"content":"Serverless"},
            {"id":3,"content":"Azure"}
        ]},
        headers: {
            'Content-Type': 'application/json'
        }
    };

    context.done();
};

Sample function for an Azure Function App. Used for this demo