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JSON to C# Class Converter - Convert JSON to C# Online Free | DevToolBox

Convert JSON to C# classes online free. Generate C# class definitions with proper types and optional namespace. Instant JSON to C# conversion in your browser.

About JSON to C# Conversion

C#'s strong type system is central to .NET development. When working with JSON APIs, you need class definitions that match the JSON structure for proper deserialization with System.Text.Json or Newtonsoft.Json. This tool analyzes your JSON data and generates C# class definitions with correct property types (string, int, double, bool, List<T>), PascalCase naming, and optional namespace wrapping. Nested objects become separate classes, and nullable types are used for null values. All processing happens locally in your browser.

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How to Use

  1. Paste your JSON data into the input panel
  2. Set the root class name and optional namespace
  3. Click Convert to generate C# classes
  4. Copy the classes into your .NET project

Common Use Cases

  • Creating C# models from REST API responses
  • Generating DTOs for ASP.NET Core applications
  • Building typed models for Blazor apps
  • Converting API documentation samples to C# types

Frequently Asked Questions

How do I convert JSON to C# classes?
Paste your JSON data, set a root class name, optionally add a namespace, and click Convert. The tool generates C# classes with proper property types.
Does it work with System.Text.Json?
Yes. The generated classes use standard C# properties that work with both System.Text.Json and Newtonsoft.Json (Json.NET).
How are arrays handled?
JSON arrays are converted to List<Type>. The tool adds using System.Collections.Generic when List types are present.
Can I add a namespace?
Yes. Enter a namespace name and the generated classes will be wrapped in a namespace block with proper indentation.