Why convert JSON to C# classes?

When developing in C#, you often need to handle JSON API responses or configuration files. Manually writing C# classes that match JSON structure is time-consuming and error-prone, especially with nested structures. An automatic generator creates strongly-typed C# class definitions from JSON samples, boosting productivity and reducing type errors.

How good is the generated class code?

The generated C# code follows standard .NET conventions: uses properties instead of fields, converts JSON property names to PascalCase, uses List for arrays, supports nested class definitions, and includes JsonProperty attributes for JSON compatibility.

What dependencies does the generated code need?

The generated code requires the Newtonsoft.Json (Json.NET) package for the JsonProperty attribute. Install via NuGet: Install-Package Newtonsoft.Json. For System.Text.Json users, replace [JsonProperty] with [JsonPropertyName].

Does it support nested JSON objects?

Yes. The tool recursively parses all nested objects and arrays in JSON, automatically generating corresponding nested classes for each level. Complex multi-level nested JSON generates a complete class hierarchy in one pass.

How are JSON arrays handled?

JSON arrays are converted to C# List based on element type. Object arrays get their own generated class. Primitive type arrays (strings, numbers) use List , List , etc.

JSON to C# Class Generator · Free Online C# Code Generator

📖 How to Use

✦ Quick Start

Paste JSON string in the input area.
Set the C# root class name (default: RootObject).
Click "Generate" to create complete C# class definitions. All code generation happens locally in your browser.

✦ Naming Conventions

Generated C# code follows .NET naming conventions: class names and property names use PascalCase. JSON snake_case and camelCase property names are automatically converted to PascalCase. The JsonProperty attribute preserves original JSON property names for deserialization compatibility.

✦ Type Inference Rules

The tool automatically infers C# types from JSON values: string→string, number→int/long/double, boolean→bool, null→object?, array→List, object→nested class. Numeric types are selected based on value range. Empty arrays use List

⚙️ JSON to C# Classes

📝 Input JSON

📖 How to Use

✦ Quick Start

✦ Naming Conventions

✦ Type Inference Rules

✦ Newtonsoft.Json vs System.Text.Json