using System;

using System.IO;

using Newtonsoft.Json;

using Newtonsoft.Json.Schema;

​

public class Program

{

    public const string payloadJson = @"{'command': 'test'}";

    public const string jsonSchema = @"{

  'type': 'object',

  'properties': {

    'command': {

      'type': 'string'

    }

  },

  'required': [

    'command'

  ]

  }";

    public static readonly JSchema commandSchema = JSchema.Parse(jsonSchema); 

    public static void Main()

    {

        using var reader = new JsonTextReader(new StringReader(payloadJson));

        using var validatingReader = new JSchemaValidatingReader(reader) { Schema = commandSchema };

        var payload = JsonSerializer.Create().Deserialize<SendMessageCommand>(validatingReader);

        payload.Dump();

    }

}

​

class SendMessageCommand

{

    public string Command {get; set;}

}