What is JSON to PHP Class Generator?

This tool converts JSON data into PHP classes with typed properties, constructors, and fromJson/toJson methods. It supports PHP 8 constructor promotion, PSR-4 namespace declarations, and Laravel Eloquent model generation.

How to Use

Set the root class name, namespace, and choose between PHP 8 constructor promotion or Laravel Eloquent mode
Paste your JSON data into the input area
Click "Generate PHP Code" and copy the output into your project

Why Use This Tool?

Automatically infer PHP types from JSON values (string, int, float, bool, array)

Generate fromJson() and toJson() methods for seamless serialization

PHP 8 constructor promotion for concise, modern class definitions

Laravel Eloquent mode with $fillable and $casts properties

Nested objects are converted to separate PHP classes with proper type hints

Tips & Best Practices

Use realistic sample data — type inference depends on actual values
Enable PHP 8 constructor promotion for cleaner, more concise class definitions
Laravel Eloquent mode generates Model classes with $fillable and $casts for quick integration
Null values in JSON are mapped to nullable types (?string, ?int, etc.)
Set the namespace to match your PSR-4 autoloading configuration

Frequently Asked Questions

What is PHP 8 constructor promotion?

PHP 8 constructor promotion lets you declare and initialize class properties directly in the constructor parameters. Instead of writing separate property declarations and constructor assignments, you write: public function __construct(public int $id, public string $name). This produces more concise and readable code.

How are JSON types mapped to PHP?

JSON strings → string, integers → int, decimals → float, booleans → bool, null → mixed (nullable), arrays → array, nested objects → separate PHP classes. Null values produce nullable types like ?string or ?int.

What does Laravel Eloquent mode generate?

Laravel Eloquent mode generates classes that extend Illuminate\Database\Eloquent\Model. It includes $fillable (for mass assignment) and $casts (for automatic type casting of boolean, float, and other non-string/int fields). The fromJson method uses self::create() and a toJsonArray method wraps toArray().

How are nested objects handled?

Nested JSON objects are converted to separate PHP classes. They are ordered children-first, so nested classes appear before the parent class that references them. The parent class uses the nested class type in its constructor and calls the nested class's fromJson/toJson methods.

Is my data sent to a server?

No, all processing happens entirely in your browser. Your JSON data never leaves your device.

JSON to PHP Class Generator