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How to Convert C to JSON - Complete Step by Step Guide

Learn how to convert C structs, arrays, and code to JSON format with our free online converter tool for embedded systems and IoT applications.

Step 1

Input Your C Code

Start by pasting your C struct initialization, struct definition, or data structure that needs to be converted to JSON format. The tool supports C structs and nested structures.

Paste C code: Copy your C struct initialization directly into the editor
Upload a file: Load C code from a .c or .h file on your computer
Try samples: Click sample buttons to see different C patterns (basic structs, arrays, nested structures)

Example: C Struct Initialization

Here's a typical C struct:

struct Person {
    char name[50];
    int age;
    char email[100];
    int isActive;
};

struct Person person = {
    .name = "John Doe",
    .age = 30,
    .email = "[email protected]",
    .isActive = 1
};
Step 2

Click Convert Button

Click the green "Convert" button to send your C code to our backend API for processing. The converter transforms C syntax to JSON format, handling integer values, arrays, and proper quote formatting.

Integer conversion: C integers become JSON numbers
String handling: C char arrays convert to JSON strings
Array support: C arrays convert to JSON arrays []
Field mapping: C struct fields become JSON key-value pairs
Nested structures: Handle complex C struct hierarchies

Example: Converted JSON Output

The same data in JSON format:

{
  "name": "John Doe",
  "age": 30,
  "email": "[email protected]",
  "isActive": 1
}
Step 3

Get Valid JSON Output

The tool produces properly formatted, valid JSON that's ready to use in your applications, APIs, or configurations.

Real-time validation: Green checkmark confirms your JSON is syntactically correct
Proper formatting: Beautified with correct indentation and structure
Ready for APIs: Use directly in REST API responses or database storage
Step 4

Copy or Download JSON

Copy the JSON to your clipboard or download it as a .json file for use in your C projects or embedded systems.

Copy to clipboard for immediate use
Download .json file for integration into your codebase
Use in embedded systems: Perfect for IoT and microcontroller projects
Export options: Convert to readable tables or minify for production

What is C to JSON Conversion?

C to JSON conversion transforms C data structures like structs, arrays, and initializations into standard JSON format. This process converts C-specific syntax into JSON-compliant syntax for data interchange and configuration management.

The conversion is essential for embedded systems, IoT applications, and system programming where JSON is the standard format for data exchange. You can also convert other languages like C# to JSON, Python to JSON, or Java to JSON using our related tools.

Frequently Asked Questions About C to JSON Conversion

How do I convert C struct to JSON?

Simply paste your C struct initialization into the converter. It will automatically convert C syntax (integers, char arrays, struct fields) to valid JSON format. The output can then be formatted or minified based on your needs.

Does the converter handle nested C structs?

Yes! The converter properly handles nested structs, arrays, and mixed data structures, converting them to equivalent JSON representations while maintaining the structure. You can also convert the reverse direction using our JSON to C converter.

What C types are supported?

The converter supports C structs, arrays, char arrays (strings), integers (int, long), floating-point numbers (float, double), and nested structures. These are converted to their JSON equivalents: objects, arrays, strings, and numbers.

Is the output valid JSON?

Yes! The converter produces standard, valid JSON that can be used in any application or API. The output is properly formatted and validated. You can further validate the JSON or convert it to other formats like TypeScript or Python.

Is the C to JSON converter free?

Yes, completely free with no limitations on data size or conversion frequency. No registration required. Check out our other free tools like JSON formatter, JSON validator, and JSON to Table converter.