Access Json Serializer options to avoid serializing null in Azure Functions v3

Question

How can I setup the serializer in Azure Functions to ignore nulls when serializing?

This is a v3 function

I have tried

        JsonConvert.DefaultSettings = () => new JsonSerializerSettings
        {
            Formatting = Formatting.Indented,
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
            NullValueHandling = NullValueHandling.Ignore
        };

In the startup for my function

I am now starting to think that Newtonsoft isnt being used for json

How can I force Newtonsoft to be used?

Cheers

Paul

Does this answer your question? [How to set json serializer settings in asp.net core 3?](https://stackoverflow.com/questions/58392039/how-to-set-json-serializer-settings-in-asp-net-core-3) — Ben Cottrell, Jul 17 '21 at 12:12

score 3 · Accepted Answer · answered Jul 17 '21 at 14:31

Adapted from Add JSON Options In HTTP Triggered Azure Functions

Prerequisites

You need ensure that all prerequisites are fulfilled as mentioned here

From that docs page:

Before you can use dependency injection, you must install the following NuGet packages:

Microsoft.Azure.Functions.Extensions

Microsoft.NET.Sdk.Functions package version 1.0.28 or later

Microsoft.Extensions.DependencyInjection (currently, only version 3.x and earlier supported)

Note:

The guidance in this article applies only to C# class library functions, which run in-process with the runtime. This custom dependency injection model doesn't apply to .NET isolated functions, which lets you run .NET 5.0 functions out-of-process. The .NET isolated process model relies on regular ASP.NET Core dependency injection patterns.

Code

Add Startup class to your Azure Function Project as given below:

using System;
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;

[assembly: FunctionsStartup(typeof(MyNamespace.Startup))]
namespace MyNamespace {
    public class Startup: FunctionsStartup {
        public override void Configure(IFunctionsHostBuilder builder) {
            builder.Services.AddMvcCore().AddJsonFormatters().AddJsonOptions(options => {
                // Adding json option to ignore null values.
                options.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
            });
        }
    }
}

This will set the JSON option to ignore null values.

This does not work in Functions V3 which is built on top of the ASP.Net core 3.0+ — Mo Nazemi, Mar 08 '22 at 16:36

score 0 · Answer 2 · answered Mar 08 '22 at 16:47

0

The accepted answer for this question does not work for Azure Functions v3+. You can use version 3.0+ of Microsoft.AspNetCore.Mvc.NewtonsoftJson package to setup the JSON serializer options.

See: https://stackoverflow.com/a/62270924/5436889

answered Mar 08 '22 at 16:47

Mo Nazemi

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Access Json Serializer options to avoid serializing null in Azure Functions v3

2 Answers2

Prerequisites

Code