JSON to C# Class Generator Online

What Is a JSON to C# Class Generator?

A JSON to C# class generator analyzes JSON data structures and produces corresponding C# POCO (Plain Old CLR Object) class definitions with automatic property declarations and type inference. C# developers working with REST APIs, Azure services, and .NET applications need strongly-typed classes to deserialize JSON responses using System.Text.Json or Newtonsoft.Json libraries.

This tool examines each JSON property's value, maps it to the appropriate C# type (string, int, double, bool, List, or nested class), generates PascalCase property names with auto-implemented getters and setters, and creates separate class definitions for nested objects. The result is clean, production-ready C# code that follows .NET naming conventions. The generation runs entirely in your browser with zero server involvement, keeping your API data private.

How to Generate C# Classes from JSON

1. Paste your JSON data into the input panel. REST API responses, Azure service outputs, or any JSON object works.
2. Click Convert to analyze the JSON and generate C# classes with PascalCase properties, correct types, and auto-property syntax.
3. Review the generated classes with proper List types for arrays, separate class definitions for nested objects, and .NET conventions.
4. Copy the C# code and paste into your .cs files. The classes work directly with System.Text.Json.JsonSerializer.Deserialize or JsonConvert.DeserializeObject.

Why Use PinusX JSON to C# Class Generator?

.NET developers building API integrations, microservices, and enterprise applications need C# class definitions that precisely match JSON API contracts. Writing these classes manually for complex responses with nested objects and arrays is slow and introduces bugs. PinusX generates accurate C# classes instantly with 100% client-side processing — your API response data from Azure services, third-party APIs, and internal microservices never leaves your browser. This privacy-first approach is critical for enterprise development where API payloads contain customer data and business logic.

Frequently Asked Questions

What C# types are generated?

JSON strings map to C# 'string', integer numbers to 'int', decimal numbers to 'double', booleans to 'bool', null to 'object', arrays to 'List<T>', and nested objects to separate class definitions. The type inference handles common patterns automatically.

Are property names formatted correctly?

Yes. Property names follow C# PascalCase conventions. A JSON key 'firstName' becomes a property named 'FirstName'. The original JSON key can be preserved using [JsonPropertyName] attributes if needed.

Does it handle arrays of objects?

Yes. Arrays of objects generate a separate class for the element type and use List<ClassName> as the property type. For example, an 'items' array of order objects produces a List<RootItemsItem> property and a separate RootItemsItem class.

Can I use this with Newtonsoft.Json?

Yes. The generated classes are plain C# POCOs compatible with both System.Text.Json and Newtonsoft.Json. Both libraries use the same property-based deserialization pattern, so the generated classes work with either library.

Is my data kept private?

Absolutely. All JSON to C# class generation runs locally in your browser. No API responses, business data, or JSON payloads are sent to any server. Your data remains on your machine throughout the generation process.

Your data never leaves your browser. 100% client-side processing.