Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson 3.0.1

There is a newer version of this package available.
See the version list below for details.
dotnet add package Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson --version 3.0.1
NuGet\Install-Package Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson -Version 3.0.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson" Version="3.0.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson --version 3.0.1
#r "nuget: Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson, 3.0.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson as a Cake Addin
#addin nuget:?package=Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson&version=3.0.1

// Install Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson as a Cake Tool
#tool nuget:?package=Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson&version=3.0.1

JSON Merge Patch support for ASP.NET Core

Nuget - Morcatko.AspNetCore.JsonMergePatch (ASP.NET Core 2.x)
Nuget - Morcatko.AspNetCore.JsonMergePatch.NewtonsoftJson (ASP.NET Core 3.x)
Nuget - Morcatko.AspNetCore.JsonMergePatch.SystemText (ASP.NET Core 3.x)
Nuget - Morcatko.AspNetCore.JsonMergePatch.Document (ASP.NET Core 3.x - base package)

JSON Merge Patch

  • RFC 7396
  • performs partial resource update similar to JSON Patch
  • Supports Swagger
  • netstandard 2.0
C# object:
var backendModel = new Model()
    Name = "James Bond"
    Age = "45"
    Weapon = "Gun"

JSON Merge Patch:
    "Weapon": "Knife"

resulting C# object:
    Name = "James Bond"
    Age = "45"
    Weapon = "Knife"

How to

See 2.1-testApp or 3.0 testApp for sample

  1. Install nuget.
  1. Add to your startup class
using Morcatko.AspNetCore.JsonMergePatch;

public void ConfigureServices(IServiceCollection services)
        .AddMvc()                         // or .AddMvcCore()
        //.AddJsonMergePatch();           // 2.x
        //.AddNewtonsoftJsonMergePatch(); // 3.x (Newtonsoft.Josn)
        //.AddSystemTextJsonMergePatch(); // 3.x (System.Text)
  1. Use in your controller
using Morcatko.AspNetCore.JsonMergePatch;

public void Patch([FromBody] JsonMergePatchDocument<Model> patch)

You can apply a patch to a different Type (be carefull, all C# static typing is ignored) - see #16 for more details.

BackendModel backendModel;
JsonMergePatch<DtoModel> patch;
  1. Swagger config (optional)

copy & paste this class into your app

services.AddSwaggerGen(c =>


        .AddJsonMergePatch(o => ....)
  • bool EnableDelete - Deletes items when target object is Dictionary and patched value is null

How to - unit testing

See tests in ...Builder.Json.Simple class for more examples


public void UnitTest()
    var model = new Model();
    var patch1 = PatchBuidler.Build<Model>("{ integer: 1}");
    var original = new Model();
    var patched = new Model() { Integer = 1};
    var patch2 = PatchBuilder.Build(original, patched);

Known issues/Not working

  • ModelState.IsValid is false when a required property is missing
  • Enums with [EnumMember(Value = "....")] attribute
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp3.0 is compatible.  netcoreapp3.1 was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

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Version Downloads Last updated
6.0.0 525,633 4/29/2022
6.0.0-alpha01 49,296 1/21/2022
3.0.7 192,715 3/24/2021
3.0.6 34,312 11/16/2020
3.0.5 8,426 9/30/2020
3.0.4 5,282 8/26/2020
3.0.3 1,926 8/7/2020
3.0.2 6,820 6/3/2020
3.0.1 76,520 3/24/2020
3.0.0 17,119 2/18/2020
3.0.0-Release0.0 978 11/27/2019
3.0.0-preview9.0 494 9/6/2019