JSON to C# Class Generator

Name: JSON to C#
Author: WUS

Free online JSON to C# class generator. Paste JSON and generate C# POCO classes with properties, JsonPropertyName attributes, nullable annotations, and nested type support. 100% browser-based with zero uploads.

100% browser-based — your data never leaves your device

POCO GenerationJsonProperty AttributesNullable Reference TypesLocal Processing

All tools

Tool

Convert JSON to C# classes instantly. Generate C# POCO classes with properties and attributes from JSON samples.

How to Use

Paste your JSON

Copy your JSON data and paste it into the input textarea above.

Configure options

Toggle nullable detection, JsonProperty attributes, and naming style preferences.

Copy the C# code

Click Generate, then copy the C# classes or download the .cs file.

JSON to C#

Paste JSON below and generate C# type definitions. The tool automatically detects types, handles nested objects, and generates clean, idiomatic code.

POCO Generation

Creates C# POCO (Plain Old CLR Object) classes with automatic properties and proper access modifiers.

JsonProperty Attributes

Optionally adds [JsonProperty("name")] attributes for JSON serialization compatibility with Newtonsoft.Json or System.Text.Json.

Nullable Reference Types

Supports C# 8.0+ nullable reference types with proper ? annotations on nullable fields.

Local Processing

All conversion happens locally — your data never leaves your browser.

JSON Input

Drop a file here or click to browse

0 chars0 words0 lines

Ln 1, Col 1

Detect nullable fields

Ctrl+Enter to generate

Frequently Asked Questions

The generator targets .NET 6+ with nullable reference types and System.Text.Json attributes. Compatible with Newtonsoft.Json via JsonProperty attributes.

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Developer Workspace

What is JSON to C#?

JSON to C# is a free online json tool that convert json to c# classes instantly. generate c# poco classes with properties and attributes from json samples. It works entirely in your browser — no downloads, no installations, and no server uploads required. backend developers, frontend engineers, DevOps engineers use JSON to C# when they need a fast, privacy-respecting way to process json data without installing additional software. It supports capabilities such as poco generation, jsonproperty attributes, nullable reference types. Additional features include local processing. Common use cases include generating c# models from api response json for .net client applications, creating data transfer objects from json schemas for rest service development, rapid prototyping of c# class hierarchies from sample data structures. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes JSON to C# ideal for working with sensitive data, proprietary code, or any situation where privacy matters.

JSON to C# Class Generator Overview

JSON to C# Class Generator is a free online json tool that helps you convert json to c# classes instantly. generate c# poco classes with properties and attributes from json samples. Key capabilities include poco generation, jsonproperty attributes, nullable reference types. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to generating c# models from api response json for .net client applications.

How to Use JSON to C#

Paste your JSON

Copy your JSON data and paste it into the input textarea above.

Configure options

Toggle nullable detection, JsonProperty attributes, and naming style preferences.

Copy the C# code

Click Generate, then copy the C# classes or download the .cs file.

Technical Specifications

Category	Details
Input Limits	Maximum file size: Browser memory bound (~2 GB)
Input Limits	Nesting depth: Unlimited (browser stack limit)
Supported Formats	JSON, JSONC (with comments), JSON5 (extended syntax)
Browser Engine	Native JSON.parse() / JSON.stringify() (ES2026) Web Workers for parallel processing

All operations run entirely in your browser using built-in JSON APIs. No server uploads, no data storage, and no third-party requests.

When to Use JSON to C#

JSON to C# is ideal when you need to generating c# models from api response json for .net client applications without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for persistent editing environments with linting, consider using VS Code with JSON extension. For for server-side JSON processing in scripts, jq (command-line) may be a better fit. JSON to C# fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.

Frequently Asked Questions

What .NET version is targeted?

The generator targets .NET 6+ with nullable reference types and System.Text.Json attributes. Compatible with Newtonsoft.Json via JsonProperty attributes.

How are nested objects handled?

Nested objects become separate nested classes within the main class. Each nested class gets its own property definitions and optional attributes.

Is my data sent to a server?

No. All conversion happens locally in your browser.

Key Features

POCO Generation

Creates C# POCO (Plain Old CLR Object) classes with automatic properties and proper access modifiers.

JsonProperty Attributes

Optionally adds [JsonProperty("name")] attributes for JSON serialization compatibility with Newtonsoft.Json or System.Text.Json.

Nullable Reference Types

Supports C# 8.0+ nullable reference types with proper ? annotations on nullable fields.

Local Processing

All conversion happens locally — your data never leaves your browser.

Common Use Cases

JSON to C# Class Generator is useful in a variety of scenarios across different workflows:

Generating C# models from API response JSON for .NET client applications

Creating data transfer objects from JSON schemas for REST service development

Rapid prototyping of C# class hierarchies from sample data structures

Tips & Best Practices

Enable JsonProperty for snake_case APIs

If your API returns snake_case JSON (e.g., user_name), enable JsonProperty attributes to map to PascalCase C# property names correctly.

Use nullable reference types for safety

Enable C# nullable reference types to distinguish between required and optional fields, improving null safety in your codebase.

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