Inference rulesNested objects split into separate types; arrays are typed automatically; optional/nullable fields detected; mixed types form unions; null / empty arrays fall back to sane types; identical shapes are deduped and name clashes disambiguated.Max input size: TBD (placeholder)

Sample JSONJSON

Paste or type JSON

GeneratedC#

Paste or type JSON

JSON → class · Local · No upload

JSON to C# Class Generator

Sample JSON → class · System.Text.Json · Nullable · Nested types

🔒Processed locally in your browser — never uploaded or stored

No upload, no storage

JSON is processed in memory and never sent to a server.

Share via URL fragment

Share links encode data in the # anchor — never sent to a server.

Remember last edit

Optionally keep your last input locally; clear it with one click.

Generate C# Classes｜Newtonsoft.Json & System.Text.Json｜Records & Nullable｜Runs Locally

Generate Classes

Nested objects split into classes with auto properties.

Serialization Attributes

Adds JsonPropertyName when a field isn't PascalCase.

Nullable Types

Optional/nullable fields use T? nullable annotations.

Compiles As-Is

Works with System.Text.Json / Newtonsoft — paste in and use.

Runs Locally — No Upload

Generation runs in your browser; data is never uploaded.