<iframe src="https://devtoolbox.dedyn.io/tools/json-to-csharp" width="100%" height="600" frameborder="0" title="JSON to C# Class Generator"></iframe>
JSON to C# Class Generator
Generate C# class definitions from JSON data. Handles nested objects, arrays, nullable types, and JsonProperty attributes. Everything runs in your browser — your data stays private.
C# classes will appear here...
About JSON to C# Class Conversion
When consuming REST APIs or working with JSON configuration files in .NET applications, having strongly-typed C# classes is essential for safe deserialization and IntelliSense support. Manually writing these classes from JSON payloads is tedious and error-prone, especially for deeply nested structures. This tool automates the entire process.
The generator inspects every value in your JSON, determines the correct C# type, and creates clean, well-structured classes. Nested objects become separate named classes. Arrays are analyzed to determine element types using List<T>. Integer and floating-point numbers are distinguished automatically. Null values produce nullable reference or value types.
Features
Generates clean C# class definitions with typed properties
Handles deeply nested objects with separate named classes
Detects array element types using List<T>
Distinguishes int, long, and double for numeric values
Supports nullable types (int?, double?, bool?)
Optional [JsonProperty] (Newtonsoft) or [JsonPropertyName] (System.Text.Json) attributes
Configurable root class name and PascalCase property conversion
100% client-side — your data never leaves your browser
The converter parses your JSON data and generates corresponding C# class definitions. Each JSON object becomes a class with typed properties. Nested objects create separate named classes, arrays are typed based on their element types (List<T>), and primitive values like strings, numbers, booleans, and null map to their C# equivalents (string, int/double, bool, and nullable types). Property names are converted to PascalCase following C# conventions.
When should I use JsonProperty attributes in C# classes?▼
JsonProperty attributes (from Newtonsoft.Json) or JsonPropertyName attributes (from System.Text.Json) are useful when your JSON property names differ from your C# property names. Since C# conventions use PascalCase but JSON typically uses camelCase or snake_case, these attributes map the original JSON key to the C# property. This ensures correct serialization and deserialization without manually renaming properties.
Is my JSON data safe when using this C# class generator?▼
Yes, completely. This JSON to C# class generator runs 100% in your browser using client-side JavaScript. Your JSON data never leaves your computer and nothing is sent to any server. You can verify this by checking the network tab in your browser's developer tools, or even use the tool offline once the page has loaded.