JSON to C# Class

Paste JSON and generate clean, ready-to-paste C# classes with nested models, namespace output, and JSON serializer attributes.

Root Class Name

Namespace

Include namespace

Wrap generated classes in a namespace block.

Use file-scoped namespace

Generate modern namespace Foo; output.

Detect DateTime

Treat ISO-8601 strings as DateTime.

Use nullable reference types

Emit string? and nullable value types when needed.

Use JsonPropertyName

Add System.Text.Json property name attributes.

Use JsonProperty

Add Newtonsoft.Json property attributes.

Initialize required lists

Emit = new(); for non-nullable list properties.

Input JSON

Your generated C# classes will appear here.

Paste a JSON object or array into the input box.
Set the root class name, namespace, and serializer attribute options.
Enable nullable references, DateTime detection, or list initialization if needed.
Copy the generated C# classes into your project.

Mixed-type arrays and inconsistent sample shapes fall back to object when a safe, more specific C# type cannot be inferred.

No. Everything runs in your browser, so your JSON stays on your device.

Yes. Root arrays generate a wrapper class that inherits from List<T>.

Yes. You can add JsonPropertyName, JsonProperty, or both.

Nullable or missing fields become nullable value types like int? or nullable reference types like string? when that option is enabled.