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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

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1

3 Answers 3

Reset to default
3

2023 edit

The various function (and MVC) versions have different ways of setting this up and may use Newtonsoft.Json or System.Text.Json

Links:

https://github.com/Azure/azure-functions-host/issues/5841#issuecomment-987168758

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

test

Original answer (older versions)

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.

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3 Comments

This does not work in Functions V3 which is built on top of the ASP.Net core 3.0+
Is it a good practice to add MvcCore in Azure functions?
@Bat_Programmer if you have a way of configuring Json formatting without adding MvcCore, then please share it. Otherwise if you need Json formatting, then it seems like this is the only way, which makes 'good practice' irrelevant.
0

In a Functions V3 App I had to use the following having installed the Microsoft.AspNetCore.Mvc.NewtonsoftJson NuGet package.

builder.Services.AddMvcCore().AddNewtonsoftJson(options => {
                // Adding json option to ignore null values.
                options.SerializerSettings.DateFormatHandling = DateFormatHandling.IsoDateFormat;
});

Source: https://github.com/Azure/azure-functions-host/issues/5841#issuecomment-987168758

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Comments

-1

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

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