JSON to C# class

How to use it

1. Enter json input and root type name.
2. The result appears straight away and updates as you edit.
3. Copy the result, or copy a link that keeps the same values to share it.

How it is calculated

string, int or long, double, bool, List<T> and object?, with a public class per object. Each property is PascalCase with [JsonPropertyName] holding the original key. null or a missing key makes the type nullable, such as int? or string?, and required strings and lists start empty.

Example

Inputs: Root type name = Root. Result: Generated code: #nullable enable using System.Collections.Generic; using System.Text.Json.Serialization; public class Root { [JsonPropertyName("id")] public int Id { get; set; } [JsonPropertyName("name")] public string Name { get; set; } = ""; [JsonPropertyName("email")] public string Email { get; set; } = ""; [JsonPropertyName("is_active")] public bool IsActive { get; set; } [JsonPropertyName("balance")] public double Balance { get; set; } [JsonPropertyName("tags")] public List<string> Tags { get; set; } = new(); [JsonPropertyName("address")] public Address Address { get; set; } = new(); [JsonPropertyName("orders")] public List<Order> Orders { get; set; } = new(); } public class Address { [JsonPropertyName("city")] public string City { get; set; } = ""; [JsonPropertyName("postal_code")] public string PostalCode { get; set; } = ""; } public class Order { [JsonPropertyName("order_id")] public string OrderId { get; set; } = ""; [JsonPropertyName("total")] public double Total { get; set; } [JsonPropertyName("coupon")] public string? Coupon { get; set; } }; Types generated: 3; Fields: 13.

{
  "id": 1024,
  "name": "Sara Ahmed",
  "email": "sara@example.com",
  "is_active": true,
  "balance": 1520.75,
  "tags": ["vip", "riyadh"],
  "address": { "city": "Riyadh", "postal_code": "12211" },
  "orders": [
    { "order_id": "A-1", "total": 99.5, "coupon": "EID10" },
    { "order_id": "A-2", "total": 120, "coupon": null }
  ]
}

#nullable enable
using System.Collections.Generic;
using System.Text.Json.Serialization;

public class Root
{
    [JsonPropertyName("id")]
    public int Id { get; set; }

    [JsonPropertyName("name")]
    public string Name { get; set; } = "";

    [JsonPropertyName("email")]
    public string Email { get; set; } = "";

    [JsonPropertyName("is_active")]
    public bool IsActive { get; set; }

    [JsonPropertyName("balance")]
    public double Balance { get; set; }

    [JsonPropertyName("tags")]
    public List<string> Tags { get; set; } = new();

    [JsonPropertyName("address")]
    public Address Address { get; set; } = new();

    [JsonPropertyName("orders")]
    public List<Order> Orders { get; set; } = new();
}

public class Address
{
    [JsonPropertyName("city")]
    public string City { get; set; } = "";

    [JsonPropertyName("postal_code")]
    public string PostalCode { get; set; } = "";
}

public class Order
{
    [JsonPropertyName("order_id")]
    public string OrderId { get; set; } = "";

    [JsonPropertyName("total")]
    public double Total { get; set; }

    [JsonPropertyName("coupon")]
    public string? Coupon { get; set; }
}

Limits and caveats

• It uses System.Text.Json, built into .NET; with Newtonsoft.Json swap the attribute for [JsonProperty].
• The = new(); initializer needs C# 9 or newer.