Convert JSON to C# classes instantly. Generate strongly-typed models with support for nested objects, nullable types, and both Newtonsoft.Json and System.Text.Json.
Initializing JSON Engine...
Preparing local environment
Generate production-ready C# code from any JSON structure
Automatically detects int, string, DateTime, Guid, and complex types
Handles deeply nested JSON structures with proper class generation
Support for both Newtonsoft.Json and System.Text.Json
Generate modern C# with records, nullable types, and init properties
PascalCase properties, proper namespaces, and XML comments
Instant conversion as you type with live preview
Transform JSON to strongly-typed C# classes instantly
{
"userId": 1,
"userName": "john_doe",
"email": "john@example.com",
"profile": {
"firstName": "John",
"lastName": "Doe",
"age": 30
},
"roles": ["admin", "user"]
}public class RootObject
{
[JsonProperty("userId")]
public int? UserId { get; set; }
[JsonProperty("userName")]
public string UserName { get; set; }
[JsonProperty("email")]
public string Email { get; set; }
[JsonProperty("profile")]
public Profile Profile { get; set; }
[JsonProperty("roles")]
public List<string> Roles { get; set; }
}
public class Profile
{
[JsonProperty("firstName")]
public string FirstName { get; set; }
[JsonProperty("lastName")]
public string LastName { get; set; }
[JsonProperty("age")]
public int? Age { get; set; }
}Common scenarios where JSON to C# conversion saves time
Generate C# models from API responses for strongly-typed data access in .NET applications.
Create C# classes from JSON exports to facilitate data migration between systems.
Convert appsettings.json structures to strongly-typed configuration classes.
Quickly scaffold C# models from JSON schemas for rapid development.
Configure the generated C# code to match your project standards
Convert JSON snake_case or camelCase to C# PascalCase
Add serialization attributes for property mapping
C# 8.0+ nullable annotations for null safety
Generate immutable record types instead of classes
Add /// summary comments to classes and properties
Generate Equals and GetHashCode overrides
Simple 3-step process to generate C# classes
Input your JSON data or load a sample
Choose namespace, class names, and features
Get your C# classes ready for your project
More tools for JSON and code generation
JSON to C# conversion is an essential process in modern .NET development, enabling developers to work with JSON data in a type-safe manner. By converting JSON structures to C# classes, you gain IntelliSense support, compile-time type checking, and improved code maintainability. This is particularly crucial when working with REST APIs, configuration files, or data interchange between systems.
Using strongly-typed C# classes instead of dynamic JSON parsing provides numerous benefits: prevention of runtime errors from typos, better performance through compile-time optimization, easier refactoring with IDE support, and improved code documentation through IntelliSense. It also enables better unit testing and makes your codebase more maintainable.
Our converter supports the latest C# features including records for immutable data structures, nullable reference types for null safety, init-only properties for immutability, and pattern matching support. Whether you're targeting .NET Framework, .NET Core, or .NET 5+, the generated code can be customized to match your target framework's capabilities.
Common questions about JSON to C# conversion
JSON to C# conversion is the process of transforming JSON (JavaScript Object Notation) data structures into C# classes or records. This allows developers to work with JSON data in a strongly-typed manner in .NET applications, providing IntelliSense support, compile-time checking, and better code maintainability.
Converting JSON to C# classes provides type safety, IntelliSense support, compile-time error checking, and better performance through strongly-typed data access. It eliminates runtime errors from typos in property names and makes refactoring easier. It's essential for API integration, configuration management, and data processing in .NET applications.
The converter recursively analyzes nested JSON objects and creates separate C# classes for each unique object structure. It maintains proper relationships between parent and child classes, handles circular references, and generates appropriate property types including complex nested types and collections.
Newtonsoft.Json (Json.NET) is a mature, feature-rich library with extensive customization options, while System.Text.Json is Microsoft's newer, high-performance JSON library included in .NET Core 3.0+. System.Text.Json is faster and has lower memory allocation, but Newtonsoft.Json offers more features and flexibility. Our converter supports both.
Yes! The converter automatically detects JSON arrays and generates appropriate C# collection types (List<T>, IEnumerable<T>, or arrays). It analyzes array elements to determine the correct generic type parameter, handling arrays of primitives, objects, and even mixed-type arrays (using object or dynamic types when necessary).
Absolutely! The converter supports C# 10+ features including records, init-only properties, nullable reference types, file-scoped namespaces, and global using directives. You can choose between traditional classes or modern record types based on your needs.
The converter intelligently maps JSON property names to C# property names following .NET naming conventions. It converts snake_case and camelCase to PascalCase, and adds JsonProperty or JsonPropertyName attributes to maintain the mapping during serialization/deserialization.
Yes, the generated C# classes can be serialized back to JSON maintaining the original structure. The JsonProperty attributes ensure that the original JSON property names are preserved during serialization, making the conversion fully reversible.