JSON to C# Converter – C# Classes with Text.Json or Newtonsoft.Json

Convert any JSON into production‑ready C# classes. Choose System.Text.Json annotations, Newtonsoft.Json, records, nullable types, and more. All code is generated client‑side – no upload, no server, 100% private.

{\n "name": "DataFrog",\n "tools": ["JSON", "C#"],\n "active": true,\n "version": 1.0\n}

✨ Why Developers Choose This JSON → C# Generator

  • 🚀 Instant conversion – Paste JSON, click Convert, get ready‑to‑use C# classes or records.
  • 🧠 No duplicate types – Nested objects are detected and reused; each unique structure becomes a separate C# type.
  • 📦 ZIP export (model folder) – Download all generated classes as separate `.cs` files inside a `model/` folder.
  • 🎨 Ace editor with syntax highlighting – Edit JSON and C# with full highlighting.
  • 🔒 100% client‑side – No data leaves your browser. Perfect for API specs or configs.
  • 📂 Upload JSON file – Load any `.json` file directly; auto‑prettified and ready.

📖 How to Convert JSON to C# Classes

1. Enter your JSON

Paste JSON into the left editor, or click “Upload JSON” to load a file.

2. Choose options

Select annotations: System.Text.Json, Newtonsoft.Json, use record instead of class, nullable reference types.

3. Convert & export

Click Convert to C# – the right panel shows your C# code. Use Copy or Export ZIP to download a `model/` folder.

🎯 Common Use Cases for JSON to C# Conversion

  • API integration – Generate C# DTOs from API response JSON.
  • Backend development – Create model classes for ASP.NET Core applications.
  • Microservices contracts – Convert OpenAPI/Swagger JSON to C# classes.
  • Testing – Quickly create C# objects from mock JSON data.

❓ Frequently Asked Questions About JSON to C# Conversion

Does this tool handle nested objects and arrays?

Yes. The converter recursively creates a separate C# class for each unique nested object. Arrays of objects become `List`.</p></div> </div> </div>

What JSON serialization libraries are supported?

You can choose System.Text.Json (built‑in) or Newtonsoft.Json. The tool adds the appropriate attributes (`[JsonPropertyName]` or `[JsonProperty]`).

Can I generate records instead of classes?

Yes. The “Use record” checkbox generates C# 9+ records (immutable by default) with positional properties.

Is my JSON data sent to any server?

Never. Everything runs locally in your browser – 100% client‑side.

Can I export all classes as separate files?

Yes. Click Export ZIP to download a `model/` folder with each generated C# type as a separate `.cs` file.

</section>

⚙️ Technical Standards & Compliance

  • JSON: RFC 8259 / ECMA‑404
  • C#: Generates C# 9+ compatible code (classes/records, auto‑properties)
  • System.Text.Json: Uses `System.Text.Json.Serialization` namespace
  • Newtonsoft.Json: Uses `Newtonsoft.Json` namespace
  • Editor: Ace Editor (tomorrow_night theme) with JSON & C# modes
  • ZIP export: JSZip creates a compliant `model.zip` with nested `.cs` files

🚀 Start Converting JSON to C# Now – Free & Private

Use the tool above – no signup, no limits. Paste your JSON, select your options, click Convert, and get production‑ready C# code instantly.

</article>