How do I return JSON from an Azure Function

Question

I am playing with Azure Functions. However, I feel like I\'m stumped on something pretty simple. I\'m trying to figure out how to return some basic JSON. I\'m not sure how to cr

Answer 1

It looks like this can be achieved just by using the "application/json" media type, without the need to explicitly serialize Person with Newtonsoft.Json.

Here is the full working sample that results in Chrome as:

{"FirstName":"John","LastName":"Doe","Orders":[{"Id":1,"Description":"..."}]}

The code is given as below:

[FunctionName("StackOverflowReturnJson")]
    public static HttpResponseMessage Run([HttpTrigger("get", "post", Route = "StackOverflowReturnJson")]HttpRequestMessage req, TraceWriter log)
    {
        log.Info($"Running Function");
        try
        {
            log.Info($"Function ran");

            var myJSON = GetJson();  // Note: this actually returns an instance of 'Person' 

            // I want myJSON to look like:
            // {
            //   firstName:'John',
            //   lastName: 'Doe',
            //   orders: [
            //     { id:1, description:'...' },
            //     ...
            //   ]
            // }
            var response = req.CreateResponse(HttpStatusCode.OK, myJSON, JsonMediaTypeFormatter.DefaultMediaType); // DefaultMediaType = "application/json" does the 'trick'
            return response;
        }
        catch (Exception ex)
        {
            // TODO: Return/log exception
            return null;
        }
    }

    public static Person GetJson()
    {
        var person = new Person();
        person.FirstName = "John";
        person.LastName = "Doe";

        person.Orders = new List();
        person.Orders.Add(new Order() { Id = 1, Description = "..." });

        return person;
    }

    public class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public List Orders { get; set; }
    }

    public class Order
    {
        public int Id { get; set; }
        public string Description { get; set; }
    }