Extensions for System.Text.Json.

Add the O9d.Json.Formatting package from NuGet

dotnet add package O9d.Json.Formatting

If you want to use a pre-release package, you can download them GitHub packages.

This O9d.Json.Formatting library adds support for snake_case formatting to System.Text.Json which is still missing. The included implementation originates from the Newtonsoft.Json project.

To configure snake case formatting when using JsonSerializer directly:

var options = new JsonSerializerOptions()
{
    PropertyNamingPolicy = new JsonSnakeCaseNamingPolicy()
};

string json = JsonSerializer.Serialize(someObj, options);

To configure snake case formatting in an ASP.NET Core MVC project:

services.AddControllers()
    .AddJsonOptions(options => 
    {
        options.JsonSerializerOptions.PropertyNamingPolicy = new JsonSnakeCaseNamingPolicy()
    });

Or in ASP.NET 6.0 Minimal APIs:

builder.Services.Configure<JsonOptions>(options =>
{
    options.SerializerOptions.PropertyNamingPolicy = new JsonSnakeCaseNamingPolicy());
});

Pre-release packages can be downloaded from GitHub Packages.

dotnet add package O9d.Json.Formatting --prerelease --source https://nuget.pkg.github.com/benfoster/index.json

More information on using GitHub packages with .NET.

This project uses Cake to build, test and publish packages.

Run build.sh (Mac/Linux) or build.ps1 (Windows) To build and test the project.

This will output NuGet packages and coverage reports in the artifacts directory.

To contribute to O9d.Json, fork the repository and raise a PR. If your change is substantial please open an issue first to discuss your objective.

The JSON documentation is built using DocFx. To build and serve the docs locally run:

./build.sh --target ServeDocs

This will serve the docs on http://localhost:8080.