JSON to C# Class

📖 JSON to C# Converter Guide

What is

C# is Microsoft's modern object-oriented language, powering the .NET ecosystem and enterprise development. When working with JSON APIs, defining C# model classes is standard practice. This tool automatically generates C# classes with proper JSON serialization attributes from any JSON data.

Key Features

Auto-generation: Paste JSON, get C# class definitions
JsonProperty attributes: Newtonsoft.Json compatibility
Nullable types: Support for nullable reference types
Namespace wrapping: Optional namespace declaration
Nested support: Handles complex nested JSON structures

Common Use Cases

Building .NET API clients for third-party services. Unity game development with JSON config files. Enterprise project migrations and refactoring. Creating data transfer objects (DTOs) for APIs.

How to Use

Paste your JSON data, set the class name, namespace, and nullable options, then click Convert. The generated C# classes include JsonProperty attributes for proper field mapping. Array types become List, and nested objects generate corresponding child classes.

Pro Tips

Default uses Newtonsoft.Json - for System.Text.Json, change to JsonPropertyName
Both List and arrays are generated as List - change to T[] if you prefer arrays
Always use real API responses as samples for the most accurate field set
DateTime fields need manual adjustment - the tool generates string type by default

Frequently Asked Questions

What is JsonProperty attribute?

JsonProperty is a Newtonsoft.Json attribute that maps a C# property name to a JSON field name. This is needed because C# uses PascalCase (PropertyName) while JSON typically uses camelCase (propertyName) or snake_case (property_name).

Should I use Newtonsoft.Json or System.Text.Json?

Newtonsoft.Json is the most popular JSON library for .NET with many features. System.Text.Json is built into .NET Core 3.0+ and is faster but has fewer features. For new projects, System.Text.Json is recommended unless you need specific Newtonsoft features.

What are nullable reference types?

Nullable reference types (C# 8.0+) let you mark reference types as nullable (string?) or non-nullable (string). This helps prevent null reference exceptions at compile time. It's a best practice for modern C# development.

How are arrays handled in C#?

JSON arrays are converted to List in C#, which is more flexible than arrays. If you need a fixed-size array, you can easily change List to T[] in the generated code.

JSON Input

C# Output

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