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JSON to C# Class

Turn a JSON sample into C# classes.

Root name: Mark missing keys optional

How to Use

Paste the JSON into the left box.
C# is already chosen.
Set the Root name for the top-level class.
Copy the classes into your project and deserialize with JsonSerializer.

Frequently Asked Questions

Which JSON library are the attributes for?

System.Text.Json, built into .NET. For Newtonsoft.Json, replace JsonPropertyName with JsonProperty.

Why are some types marked with a question mark?

They were null or missing in the sample, so they are nullable.

Why long and double?

They hold any JSON number without overflow; change them to int or decimal where you know the range or need exact money values.

Is my JSON sent anywhere?

No. Everything happens in your browser.

Generate C# Classes from JSON

Updated September 30, 2026 · By Saman

Deserializing JSON in .NET starts with a class for every object. This page opens JSON to Types with C# chosen, so the classes and property names are written for you, with the original JSON keys kept in attributes.

Naming

Properties use PascalCase, as .NET style expects, and [JsonPropertyName("order_id")] keeps the link to the JSON key, so no custom naming policy is needed.

Related tools

For a TypeScript frontend on the same API, see JSON to TypeScript.

Guides

How to Type an API Response in TypeScript fetch gives you data typed as any, which switches TypeScript off exactly where bugs come from. Here is how to give API data a real type, quickly and safely.

JSON to C# Class

Generate C# Classes from JSON

Naming

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