JSON to C# Converter

Convert your JSON data to C# classes with our powerful online tool. Features include nested JSON support, custom class names, and real-time preview.

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What is a JSON to C# Converter?

Paste a JSON response here to get back C# classes with PascalCase auto-properties, ready for System.Text.Json or Newtonsoft.Json to deserialize into.

A JSON to C# converter reads your JSON sample, infers the right .NET type for each field, and emits idiomatic class definitions so you can skip writing DTOs by hand for every new endpoint.

This tool handles nested objects, custom root class names, and modern C# syntax, which fits ASP.NET, Blazor, and console projects without extra tweaking.

How to Use Our JSON to C# Converter

Paste your JSON data into the left editor or click the sample data button to load example JSON
Enter your desired root class name in the class name input field
The tool validates your JSON and highlights any syntax errors immediately
The converter generates C# classes with PascalCase properties and proper type mappings in real-time
Nested JSON objects are automatically converted into separate C# classes with proper references
Copy the generated C# code to clipboard or download it as a .cs file

Examples

Customer DTO for an ASP.NET endpoint

JSON keys get converted to PascalCase auto-properties so System.Text.Json can deserialize them out of the box.

Input

{
  "customerId": 501,
  "fullName": "Alice Park",
  "loyaltyPoints": 1240
}

Output

public class Customer
{
    public int CustomerId { get; set; }
    public string FullName { get; set; }
    public int LoyaltyPoints { get; set; }
}

Nested invoice with nullable field

Nested objects produce separate classes; null values surface as nullable C# types (int?, string?).

Input

{
  "invoiceNo": "INV-2042",
  "amount": 199.95,
  "paidAt": null,
  "billTo": {
    "company": "Acme GmbH",
    "vatId": "DE123456789"
  }
}

Output

public class BillTo
{
    public string Company { get; set; }
    public string VatId { get; set; }
}

public class Invoice
{
    public string InvoiceNo { get; set; }
    public double Amount { get; set; }
    public string? PaidAt { get; set; }
    public BillTo BillTo { get; set; }
}

JSON specification reference

Quick reference from RFC 8259. The converter enforces these rules on input; anything outside them is rejected or normalized.

Element	Meaning	Example
Object	Unordered set of key/value pairs	{"a": 1}
Array	Ordered list of values	[1, 2, "x"]
String	Unicode, double-quoted only	"hello"
Number	IEEE 754 double, no NaN / Infinity	3.14
Literal	true / false / null only	null

Common invalid forms

{'a': 1}  // single quotes not allowed
{a: 1}    // unquoted keys
{"a": 1,} // trailing comma
NaN       // not permitted by RFC 8259

Key Features

C# Class Generation: Creates complete C# classes with auto-properties, proper access modifiers, and standard .NET conventions
PascalCase Naming: Automatically converts JSON keys to PascalCase for class names and properties following C# best practices
Smart Type Mapping:Maps JSON types to C# types — strings to string, numbers to int/double, arrays to List<T>, nulls to nullable types
Nested Class Support: Nested JSON objects generate separate C# classes with proper references and type hierarchy
100% Client-Side: All code generation happens in your browser — your data never leaves your device, ensuring complete privacy

Frequently Asked Questions

Q: How does the converter handle nullable JSON values in C# classes?

When a JSON field contains a null value, the converter generates a nullable C# type using the ? suffix (e.g., int?, string?). This ensures the generated classes accurately represent optional data and are compatible with C# nullable reference type annotations introduced in C# 8.0 and later.

Q: Does the converter generate properties with proper C# naming conventions?

Yes. The converter follows C# PascalCase naming conventions for class names and properties. JSON keys are automatically converted to PascalCase, and the generated classes include proper C# property syntax with get and set accessors.

Q: Are the generated classes compatible with System.Text.Json and Newtonsoft.Json?

Yes. The generated C# classes use standard property definitions that work with both System.Text.Json and Newtonsoft.Json serialization libraries. You can directly use the classes for JSON deserialization in your .NET applications without modification.

Q: Are there any file size limitations?

There is no hard file size limit. Since all processing happens in your browser, the practical limit depends on your device's available memory. Most modern browsers can handle JSON files up to several megabytes without issues.

Q: Can I use the generated classes in .NET Framework and .NET Core projects?

Yes. The generated C# classes use standard syntax that is compatible with both .NET Framework and .NET Core/.NET 5+ projects. The classes work with any modern C# version and can be used immediately in ASP.NET, Blazor, or console applications.

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JSON to C# Converter

Convert your JSON data to C# classes with our powerful online tool. Features include nested JSON support, custom class names, and real-time preview.

Loading editors...

Auto Sync

Automatically sync from left

Loading editors...

What is a JSON to C# Converter?

Paste a JSON response here to get back C# classes with PascalCase auto-properties, ready for System.Text.Json or Newtonsoft.Json to deserialize into.

A JSON to C# converter reads your JSON sample, infers the right .NET type for each field, and emits idiomatic class definitions so you can skip writing DTOs by hand for every new endpoint.

This tool handles nested objects, custom root class names, and modern C# syntax, which fits ASP.NET, Blazor, and console projects without extra tweaking.

How to Use Our JSON to C# Converter

Paste your JSON data into the left editor or click the sample data button to load example JSON
Enter your desired root class name in the class name input field
The tool validates your JSON and highlights any syntax errors immediately
The converter generates C# classes with PascalCase properties and proper type mappings in real-time
Nested JSON objects are automatically converted into separate C# classes with proper references
Copy the generated C# code to clipboard or download it as a .cs file

Examples

Customer DTO for an ASP.NET endpoint

JSON keys get converted to PascalCase auto-properties so System.Text.Json can deserialize them out of the box.

Input

{
  "customerId": 501,
  "fullName": "Alice Park",
  "loyaltyPoints": 1240
}

Output

public class Customer
{
    public int CustomerId { get; set; }
    public string FullName { get; set; }
    public int LoyaltyPoints { get; set; }
}

Nested invoice with nullable field

Nested objects produce separate classes; null values surface as nullable C# types (int?, string?).

Input

{
  "invoiceNo": "INV-2042",
  "amount": 199.95,
  "paidAt": null,
  "billTo": {
    "company": "Acme GmbH",
    "vatId": "DE123456789"
  }
}

Output

public class BillTo
{
    public string Company { get; set; }
    public string VatId { get; set; }
}

public class Invoice
{
    public string InvoiceNo { get; set; }
    public double Amount { get; set; }
    public string? PaidAt { get; set; }
    public BillTo BillTo { get; set; }
}

JSON specification reference

Quick reference from RFC 8259. The converter enforces these rules on input; anything outside them is rejected or normalized.

Element	Meaning	Example
Object	Unordered set of key/value pairs	{"a": 1}
Array	Ordered list of values	[1, 2, "x"]
String	Unicode, double-quoted only	"hello"
Number	IEEE 754 double, no NaN / Infinity	3.14
Literal	true / false / null only	null

Common invalid forms

{'a': 1}  // single quotes not allowed
{a: 1}    // unquoted keys
{"a": 1,} // trailing comma
NaN       // not permitted by RFC 8259

Key Features

C# Class Generation: Creates complete C# classes with auto-properties, proper access modifiers, and standard .NET conventions
PascalCase Naming: Automatically converts JSON keys to PascalCase for class names and properties following C# best practices
Smart Type Mapping:Maps JSON types to C# types — strings to string, numbers to int/double, arrays to List<T>, nulls to nullable types
Nested Class Support: Nested JSON objects generate separate C# classes with proper references and type hierarchy
100% Client-Side: All code generation happens in your browser — your data never leaves your device, ensuring complete privacy