JSON to C# Class Converter – System.Text.Json Models

Input

Output

Ready

Ln 1, Col 1

Convert JSON to C# in one step

Paste JSON and get C# classes with PascalCase properties mapped to the original keys through [JsonPropertyName], for .NET 6 and later.

How to use it

Paste a JSON sample into the Input panel, open a file, or drop it onto the page. A sample is already loaded so you can see the result.
The C# code appears instantly in the Output panel and updates as you type.
Rename the top-level type under Settings → Root type name, and use Sort keys to order fields alphabetically.
Copy the code or Download it as Root.cs.

What the C# generator produces

Auto-properties with [JsonPropertyName("key")] attributes.
long, double, bool and string, with ? for optional or nullable values.
Arrays become List<T>; non-nullable strings, lists and objects are initialised to avoid null warnings.
Property names that would clash with the class name are adjusted automatically.

Using the generated C# code

Deserialize with System.Text.Json:

using System.Text.Json;

var data = JsonSerializer.Deserialize<Root>(json);
Console.WriteLine(data?.Users[0].Name);

More JSON tools

All tools are free and run privately in your browser.

JSON FormatterBeautify, validate & convert JSON ValidatorFind errors by line and column JSON ViewerCollapsible tree with search JSON MinifierCompress JSON, see bytes saved JSON RepairFix broken JSON automatically JSONPath TesterQuery and filter JSON JSON EscapeStringify and unescape JSON JSON to YAMLReadable YAML for configs JSON to CSVArrays to spreadsheet rows JSON to XMLWell-formed XML output CSV to JSONSpreadsheets to JSON arrays JSON Schema GeneratorInfer a draft 2020-12 schema JSON to TypeScriptInterfaces with optional fields JSON to GoStructs with json tags JSON to JavaRecords with Jackson annotations JSON to KotlinData classes for kotlinx.serialization JSON to SwiftCodable structs with CodingKeys JSON to DartFlutter models with fromJson JSON to C#Classes for System.Text.Json JSON to C++Structs for nlohmann/json JSON to CTyped structs for C JSON to PHPReadonly DTO classes JSON to PythonDataclasses with type hints

JSON to C# FAQ

Can I use Newtonsoft.Json instead?

Yes. Replace [JsonPropertyName] with [JsonProperty] and the using directive with using Newtonsoft.Json.

Is my data uploaded to a server?

No. The JSON to C# runs entirely in your browser using JavaScript. Your data is never uploaded, logged or stored, and the tool keeps working offline after your first visit.