JSON to C# Class Generator helps you work with JSON data quickly and accurately, right in your browser. Whether you need to convert json to c# classes instantly. generate c# poco classes with properties and attributes from json samples, this tool eliminatessyntax errors, malformed data, and inconsistent formatting by giving you instant, reliable results. Every operation runs locally on your device — nothing is uploaded to any server, so your data stays completely private.
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.
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
- 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
JSON to C# Class Generator
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.
Drop a file here or click to browse
Ctrl+Enter to generate
Frequently Asked Questions
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What is JSON to C# Class Generator?
JSON to C# Class Generator is a free online tool that convert json to c# classes instantly. generate c# poco classes with properties and attributes from json samples. Whether you are debugging an API response, transforming configuration files, or preparing data for frontend state management, this tool handles JSON data efficiently — all within your browser. Key capabilities include POCO Generation, JsonProperty Attributes, Nullable Reference Types. Every operation is local, meaning your data never touches a server.
Unlike JSON utilities that require uploading your data to remote servers, JSON to C# processes everything on your device. This approach gives you instant feedback, unlimited file sizes, and complete data privacy. It is particularly valuable when working with sensitive API payloads, proprietary configuration files, or large datasets you do not want to expose over the network.
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.
How does the POCO Generation feature work?
The POCO Generation feature creates c# poco (plain old clr object) classes with automatic properties and proper access modifiers. It is designed to be intuitive and responsive, giving you immediate feedback as you interact with the tool. All processing happens locally in your browser.
What is the benefit of jsonproperty attributes?
JsonProperty Attributes optionally adds [jsonproperty("name")] attributes for json serialization compatibility with newtonsoft.json or system.text.json. This capability sets JSON to C# apart from basic alternatives by providing more comprehensive functionality while maintaining the privacy and speed of local processing.
Is JSON to C# really free to use?
Yes, JSON to C# is completely free with no hidden charges, no sign-up requirements, and no usage limits. You can use it as often as you need, for any purpose — personal projects, commercial work, or educational use. There are no premium tiers or paid features.
Does JSON to C# work on mobile devices?
Yes, it works on any device with a modern web browser — desktop, tablet, or phone. The interface is responsive and adapts to your screen size. Since all processing is done locally, you get the same performance regardless of your device.
What happens to my data when I use JSON to C#?
Your data never leaves your device. Every operation is performed locally in your browser using JavaScript. No information is uploaded, stored, logged, or shared with any server. This privacy-first approach means you can work with sensitive data — passwords, API keys, personal information — without any risk of exposure.
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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Explore more json tools to enhance your workflow:
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JSON Validator
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JSON Path Tester
Test JSONPath expressions against JSON data and see matched results.
JSON Schema Generator
Generate JSON Schema (draft-07) from sample JSON data automatically.
JSON Compare
Compare two JSON files side by side with real-time diff highlighting.
CSV to JSON Converter
Convert CSV data to JSON format with support for headers and custom delimiters.
Related Guides & Articles
Deepen your knowledge with these json guides and tutorials:
Common Errors & Fixes
Learn how to fix common errors related to JSON to C#:
JSON Unexpected Token
Learn what causes the 'JSON Parse error: Unexpected token' error and how to fix it in JavaScript, Python, and other languages.
JSON Circular Reference Error
Fix 'Converting circular structure to JSON' error when using JSON.stringify with objects that reference themselves.
500 Internal Server Error
Learn what 500 Internal Server Error means, common causes, and how to debug and fix server-side failures.