JSON to C#

Convert JSON data to C# class using quicktype engine. Supports NewtonSoft/System.Text.Json framework switching and rich code generation options.

Root Type Name

Namespace

Serialization Framework

Array Type

Output Features

Number Type

Any Type

C# Version

Base Class

Virtual properties (generates virtual modifier)

Check required (fails if required properties missing)

Keep original property names (no PascalCase)

JSON Input

C# Output

Usage

Features

Based on quicktype engine, this tool automatically converts JSON data to C# class definitions with type inference, framework switching, and namespace configuration.

Steps

Enter or paste JSON data in the left text box, set the root type name and generation options. C# code will be generated in real time on the right.

Configuration

Serialization framework: NewtonSoft (default, generates JsonProperty attributes) or System.Text.Json (generates JsonPropertyName attributes).
!Array type: List<T> or T[], controls the C# type of array fields.
Output features: complete (full converter + attributes), attributes-only, just-types-and-namespace, or just-types.
Number type: double or decimal, controls the C# type of floating-point fields.
Any type: object or dynamic, controls the C# type of any fields.
C# version: 5 or 6, affects which syntax features are used in the generated code.
Base class: Object (default) or EntityData, controls the base class of generated classes.

Notes

Number types are automatically inferred as long or double. null values are inferred as object. Nested objects generate corresponding nested class definitions.