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JSON to C# Class Generator – Free, Offline & 100% Private
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C# Class Generator

Generate strongly-typed C# classes from your JSON schema automatically.
Last updated: July 7, 2026•100% Client-Side & Private
INPUTJSON

INPUT

Paste or type your data here, or click "Load Sample" to try an example.

orOpen Fileor Drag & Drop
OUTPUTCSHARP

Ready: C# Class Generator

Generate strongly-typed C# classes from your JSON schema automatically.

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About this Tool

Free JSON to C# Class Generator. Instantly convert JSON to strongly-typed C# classes (records, POCOs) 100% client-side & offline.

1Why Use a JSON to C# Class Generator?

Using a JSON to C# Class Generator is the fastest way to scaffold strongly-typed C# models from raw API data payloads. This tool parses the nested structures of your JSON arrays and objects, automatically converting them into C# records, POCOs, or classes with modern conventions. Consuming JSON APIs in .NET usually requires mapping keys to properties, a tedious task prone to errors and syntax mismatches. By automating this mapping client-side, the generator matches primitive types like strings, integers, floats, dates, and lists accurately. The entire compiler operates inside your local browser memory using JavaScript, keeping sensitive API structures completely private from third parties. It is a critical developer utility for backend teams integrating third-party webhooks or services. Read more details in JSON to TypeScript & C# POCOs: Privacy-Safe and Why Offline-First Developer Tools Matter. For more details, explore our blog articles: Why Offline-First Developer Tools Matter and The Hidden Risks of Online Developer Tools.

2How It Works (100% Client-Side)

The entire conversion runs locally in your browser using pure JavaScript and Web Workers. Paste or upload your JSON, and the engine infers types, map arrays, and applies PascalCase formatting. No server calls are ever made, making it completely secure for enterprise and compliance requirements.

3Features

Our tool generates modern C# records or traditional classes. It supports nullable reference types, System.Text.Json or Newtonsoft.Json attributes, custom indent widths, and infers types for strings, floats, integers, lists, booleans, and dates. It is fully offline-ready and installable as a PWA.

4Example: JSON to C# Class

Input JSON:
{ "orderId": "ORD-123", "customer": { "name": "Alice", "email": "alice@example.com" }, "items": [ { "product": "Laptop", "price": 1299.99 } ] }
Generated C# (using records):
public record Root( string OrderId, Customer Customer, List<Item> Items ); public record Customer( string Name, string Email ); public record Item( string Product, double Price );

5Common Pitfalls & Pro Tips

Ensure you select the right attribute tags: System.Text.Json is default for modern .NET Core, while Json.NET is standard for older projects. Enable nullable properties if your payload contains fields that might return null. Keep names clean with automatic PascalCase conversion.

6Privacy Guarantee – In-Memory Execution

Secure Devutils performs all conversions inside your browser sandbox. Unlike remote generators that log schemas, we make no network requests. You can open Chrome DevTools and check the network tab; all computation is completely localized to your CPU and RAM.

Privacy Guarantee

The JSON to C# Class Generator – Free, Offline & 100% Private operates 100% locally in your web browser. Your JSON objects, arrays, and keys are processed entirely in-memory using Web Workers and JavaScript. No JSON data is ever transmitted across the network or stored on external servers, making it completely safe for sensitive enterprise payloads.