Does it support nested objects and arrays?

Yes, nested objects become separate classes and arrays infer the singular element type.

Can I generate records instead of classes?

Yes, toggle the Use record option to emit C# records.

How are dates and GUIDs detected?

String values matching ISO dates or GUID patterns are typed as DateTime or Guid automatically.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

JSON to C# Class

Generate C# classes or records from JSON, with nullable reference types.

Support

Works Offline

Privacy First

No Login

No API

Root class name

Use record

Nullable reference types

JsonPropertyName attributes

List<T> instead of arrays

JSON

C# classes

using System;
using System.Collections.Generic;
using System.Text.Json.Serialization;

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

    [JsonPropertyName("userName")]
    public string? UserName { get; set; }

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

    [JsonPropertyName("score")]
    public double Score { get; set; }

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

    [JsonPropertyName("profile")]
    public Profile? Profile { get; set; }
}

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

    [JsonPropertyName("zip")]
    public object? Zip { get; set; }
}

About the JSON to C# Class

Paste JSON and instantly get ready-to-compile C# class or record definitions. Nested objects become their own classes, arrays infer the singular type, and common value shapes are detected (DateTime, Guid, bool, int, double). Toggle record vs class, nullable reference types, JsonPropertyName attributes and List<T> vs array.

Examples

User object

{"id":42,"name":"Ada"}

Output

public class Root { public int Id { get; set; } public string Name { get; set; } }

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-25 · Runs entirely in your browser