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JSON Serialization: How to Serialize Objects to JSON

Learn how to serialize objects, structs, classes, and data structures from any programming language to JSON format with our free online tool.

Step 1

Paste Your Code or Data

Enter any code or data structure from your programming language - the tool automatically detects the language and serializes it to JSON. Supports C, C++, C#, Python, JavaScript, Java, TypeScript, Go, and more.

Example: Try This C# Object

Copy and paste this example to see how it works:

new User {
    Name = "Alice",
    Age = 28,
    Email = "[email protected]",
    IsActive = true
}

Step 2

Click "Serialize to JSON"

Our AI-powered backend automatically detects your code language and serializes it to valid JSON format. The tool handles type conversions, naming conventions, and proper JSON formatting.

Result: Serialized JSON

{
  "Name": "Alice",
  "Age": 28,
  "Email": "[email protected]",
  "IsActive": true
}

Step 3

Copy or Download JSON

Copy the serialized JSON to your clipboard or download it as a .json file for use in your applications, APIs, or configuration files.

What is JSON Serialization?

JSON serialization is the process of converting data structures, objects, classes, or structs from programming languages into JSON (JavaScript Object Notation) format. This transformation allows data to be easily stored, transmitted, and shared across different systems, platforms, and programming languages.

When you serialize an object to JSON, you're converting in-memory data structures into a text-based format that can be saved to files, sent over networks, stored in databases, or transmitted via APIs. This is essential for modern web development, REST APIs, microservices, and data interchange.

Common use cases include: REST API responses, configuration files, data storage, inter-process communication, web services, and cross-platform data exchange.

Language-Specific JSON Serialization

C Object to JSON Serialization

Serialize C structs and data structures to JSON. Our tool automatically handles struct members, arrays, and nested structures. For more details, see our C to JSON converter.

C++ Object Serialization

Serialize C++ classes, structs, and STL containers (std::vector, std::map, std::string) to JSON format. Learn more about C++ to JSON conversion.

C# JSON Serialization with Newtonsoft.Json

Serialize C# objects and classes to JSON, similar to JsonConvert.SerializeObject() from Newtonsoft.Json. Explore our C# to JSON tool.

Python JSON Serialization

Serialize Python dictionaries, objects, and dataclasses to JSON, equivalent to json.dumps(). Check out Python to JSON conversion.

Frequently Asked Questions About JSON Serialization

What is JSON serialization and how does it work?

JSON serialization is the process of converting in-memory data structures (objects, classes, structs) into a JSON text format. It transforms complex data types into a string representation that can be saved, transmitted, or shared. The reverse process (converting JSON back to objects) is called deserialization or parsing.

How do I serialize an object to JSON in C?

To serialize a C object (struct) to JSON, you can use libraries like cJSON or Jansson, or use our online tool. Simply paste your C struct initialization and it will automatically convert to JSON format. Learn more with our C to JSON converter with detailed examples.

What's the difference between JsonConvert.SerializeObject and JsonSerializer.Serialize in C#?

JsonConvert.SerializeObject() is from the Newtonsoft.Json library (Json.NET), while JsonSerializer.Serialize() is from System.Text.Json (.NET Core 3.0+). Both serialize C# objects to JSON, but System.Text.Json is faster and included in modern .NET. Our tool mimics both approaches. See C# JSON serialization examples.

How to handle null values during JSON serialization?

Most serialization libraries offer options to include or exclude null values. In C# (Newtonsoft.Json), use NullValueHandling.Ignore. In Python's json.dumps, null becomes null in JSON. Our tool preserves null values by default for data integrity.

Can I serialize circular references or recursive objects?

Circular references (objects that reference themselves) cannot be directly serialized to JSON as it would create infinite loops. Most libraries will throw errors. You need to either break the circular reference, use custom serializers, or configure the serializer to handle references (like Json.NET's ReferenceLoopHandling).

Is this JSON serialization tool free?

Yes! Completely free with no limits on usage, file size, or conversion frequency. No registration or sign-up required. Perfect for developers working with multiple programming languages. Also try our JSON formatter, JSON validator, and other free tools.

JSON Serialization - Serialize Any Code or Data to JSON Online

Free Online JSON Serialization Tool