Generate C# classes from JSON Schema [closed]

Answer 1

Visual Studio 2017 has this feature.

From the menu, choose Edit, Paste Special, Paste JSON As Classes. Paste in the JSON and Visual Studio will create the required classes.

Answer 2

In order to answer this correctly you need to know what version (draft) the Json Schema has.

Examples which libraries can handle which Schema (2018-01-19):

Json.NET Schema supports draft 3, draft 4, draft 6 (MIT)
Manatee.Json supports draft 4, draft 6, draft 7 (MIT)
NJsonSchema supports draft 4 (Ms-PL)

http://json-schema.org/implementations.html#validator-dotnet

With NJsonSchema.CodeGeneration you can't send the actual JSON in directly either, you first need to convert it to an actual schema (You will often get the error: Unable to cast object of type 'System.String' to type 'NJsonSchema.JsonSchema4 otherwise).

Example with running code, Schemas folder located at project root:

class Program
{
    static void Main(string[] args)
    {
        var location = Assembly.GetExecutingAssembly().Location;
        var path = Path.GetFullPath(Path.Combine(location, @"..\..\..\Schemas"));
        var schemaJson = File.ReadAllText($"{path}Test.json");
        var schema = JsonSchema4.FromJsonAsync(schemaJson).Result;
        var generator = new CSharpGenerator(schema);
        var generatedFile = generator.GenerateFile();
    }
}

Answer 3

I had a need for this today and didn't see any solid answers to your question so I whipped this up. It's not perfect but it's a good starting point to build off of.

https://gist.github.com/rushfrisby/c8f58f346548bf31e045

Answer 4

Look up this library on nuget. The NJsonSchema.CodeGeneration can be used to generate C# or TypeScript code from a JSON schema:

var generator = new CSharpGenerator(schema);
var file = generator.GenerateFile();

The file variable now contains the C# code for all the classes defined in the JSON schema.

I needed a class generated today but couldn't find any site that could convert json schema to c# classes online so used the above mentioned library and wrote something up quickly http://json2csharp.rohitl.com/ hope this helps.

Answer 5

Have a look at the Help of Json.NET There is a Json.Schema namespace that can be useful.

http://james.newtonking.com/projects/json/help/

Json.NET - Quick Starts & API Documentation Newtonsoft.Json.Schema Namespace Namespaces ► Newtonsoft.Json.Schema

The project page: http://json.codeplex.com/

Answer 6

You can use the library NJsonSchema to read a JSON schema or generate one from a type, and generate a C# class from it.

If you need a GUI for these tasks, you can try the NSwagStudio GUI from the NSwag tools to do so... (it is also based on NJsonSchema)