webfiori/jsonx

PHP library for creating well-formatted JSON strings.

4.0.1 2026-03-04 10:29 UTC

Requires

• php: >=8.1
• ext-json: *

Requires (Dev)

• friendsofphp/php-cs-fixer: ^3.92
• phpunit/phpunit: ^10.0

MIT

• php
• json
• jsonx

README

A PHP library for creating and parsing JSON and JSONx strings. Supports all PHP scalar types, arrays, and objects with flexible property naming styles.

Table of Contents

• Features
• Supported PHP Versions
• Installation
• Basic Usage
• Working With Arrays
• Working With Objects
  • Using JsonI Interface
  • Auto-Mapping Objects
• Property Naming Styles
• Decoding JSON
• Saving to File
• JSONx
• Error Handling
• API Reference

Features

• Create well-formatted JSON strings from any PHP value (scalars, arrays, objects)
• Decode JSON strings and files into Json objects
• Flexible property naming styles: camelCase, kebab-case, snake_case, or none
• Letter case control: same, upper, lower
• Custom object serialization via the JsonI interface
• Auto-mapping of plain objects via public getter methods and public properties
• JSONx output (XML representation of JSON)
• Save JSON output directly to a file

Supported PHP Versions

Build Status

Installation

{
    "require": {
        "webfiori/jsonx": "*"
    }
}

Or for a specific version:

{
    "require": {
        "webfiori/jsonx": "^3.0"
    }
}

Then run:

composer install

Basic Usage

use WebFiori\Json\Json;

$json = new Json([
    'name'    => 'Ibrahim',
    'age'     => 30,
    'married' => false,
    'score'   => 9.5,
    'notes'   => null,
]);

echo $json;

Output:

{"name":"Ibrahim","age":30,"married":false,"score":9.5,"notes":null}

You can also build the object incrementally using the add*() methods:

$json = new Json();
$json->addString('name', 'Ibrahim');
$json->addNumber('age', 30);
$json->addBoolean('married', false);
$json->addNull('notes');

echo $json;

Working With Arrays

$json = new Json();

// Indexed array
$json->addArray('tags', ['php', 'json', 'api']);

// Associative array represented as a JSON object
$json->addArray('address', ['city' => 'Riyadh', 'country' => 'SA'], true);

echo $json;

Output:

{"tags":["php","json","api"],"address":{"city":"Riyadh","country":"SA"}}

Working With Objects

Using JsonI Interface

Implement JsonI to fully control how an object is serialized:

use WebFiori\Json\Json;
use WebFiori\Json\JsonI;

class User implements JsonI {
    public function __construct(
        private string $username,
        private string $email
    ) {}

    public function toJSON(): Json {
        return new Json(['username' => $this->username, 'email' => $this->email]);
    }
}

$json = new Json();
$user = new User('ibrahim', '[e-mail]');
$json->addObject('user', $user);

echo $json;

Output:

{"user":{"username":"ibrahim","email":"[e-mail]"}}

Auto-Mapping Objects

For objects that don't implement JsonI, the library maps them automatically using two sources:

1. Public getter methods — any method prefixed with get is called and its return value is added. The property name is the method name with get stripped (e.g. getName() → Name). Methods returning null or false are skipped.
2. Public properties — extracted via reflection and added as-is, including those with a null value.

class Product {
    public string $sku = 'ABC-001';       // added via reflection
    private string $name;
    private float $price;

    public function __construct(string $name, float $price) {
        $this->name  = $name;
        $this->price = $price;
    }

    public function getName(): string { return $this->name; }   // → "Name"
    public function getPrice(): float { return $this->price; }  // → "Price"
}

$json = new Json();
$product = new Product('Keyboard', 49.99);
$json->addObject('product', $product);

echo $json;

Output:

{"product":{"Name":"Keyboard","Price":49.99,"sku":"ABC-001"}}

Property Naming Styles

Four naming styles are supported: none (default), camel, snake, kebab.
Three letter cases are supported: same (default), upper, lower.

Set them in the constructor or change them later with setPropsStyle():

$data = ['first-name' => 'Ibrahim', 'last-name' => 'Al-Shikh'];

echo new Json($data, 'none')  . "\n"; // {"first-name":"Ibrahim","last-name":"Al-Shikh"}
echo new Json($data, 'camel') . "\n"; // {"firstName":"Ibrahim","lastName":"Al-Shikh"}
echo new Json($data, 'snake') . "\n"; // {"first_name":"Ibrahim","last_name":"Al-Shikh"}
echo new Json($data, 'kebab') . "\n"; // {"first-name":"Ibrahim","last-name":"Al-Shikh"}

// Change style after construction
$json = new Json($data);
$json->setPropsStyle('snake', 'upper');
echo $json . "\n"; // {"FIRST_NAME":"Ibrahim","LAST_NAME":"Al-Shikh"}

Decoding JSON

Decode a JSON string directly:

$json = Json::decode('{"name":"Ibrahim","age":30}');

echo $json->get('name'); // Ibrahim
echo $json->get('age');  // 30

Read from a file:

try {
    $json = Json::fromJsonFile('/path/to/file.json');
    echo $json->get('someKey');
} catch (\WebFiori\Json\JsonException $e) {
    echo 'Error: ' . $e->getMessage();
}

Saving to File

$json = new Json(['name' => 'Ibrahim', 'age' => 30]);

try {
    $json->toJsonFile('data', '/path/to/directory', true);
    // Creates /path/to/directory/data.json
} catch (\WebFiori\Json\JsonException $e) {
    echo 'Error: ' . $e->getMessage();
}

JSONx

JSONx is an IBM standard that represents JSON as XML:

$json = new Json([
    'name'       => 'Ibrahim',
    'age'        => 30,
    'isEmployed' => true,
]);

echo $json->toJSONxString();

Output:

<?xml version="1.0" encoding="UTF-8"?>
<json:object xsi:schemaLocation="http://www.datapower.com/schemas/json jsonx.xsd"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:json="http://www.ibm.com/xmlns/prod/2009/jsonx">
    <json:string name="name">
        Ibrahim
    </json:string>
    <json:number name="age">
        30
    </json:number>
    <json:boolean name="isEmployed">
        true
    </json:boolean>
</json:object>

Error Handling

All errors throw \WebFiori\Json\JsonException:

try {
    $json = Json::decode('{invalid json}');
} catch (\WebFiori\Json\JsonException $e) {
    echo 'Error code: '    . $e->getCode()    . "\n";
    echo 'Error message: ' . $e->getMessage() . "\n";
}

API Reference

Classes

Class	Description
Json	Main class for building and reading JSON data
JsonI	Interface for custom object serialization
JsonConverter	Handles serialization to JSON and JSONx strings
Property	Represents a single JSON property
CaseConverter	Converts property names between naming styles
JsonTypes	Constants for JSON data types
JsonException	Exception thrown on JSON errors

Key Methods — Json

Method	Description
add(string $key, mixed $value, bool $arrayAsObj = false): bool	Add any value
addString(string $key, string $val): bool	Add a string
addNumber(string $key, int|float $value): bool	Add a number
addBoolean(string $key, bool $val = true): bool	Add a boolean
addNull(string $key): bool	Add a null value
addArray(string $key, array $value, bool $asObject = false): bool	Add an array
addObject(string $key, object &$val): bool	Add an object
get(string $key): mixed	Get a property value
hasKey(string $key): bool	Check if a key exists
remove(string $key): ?Property	Remove a property
setPropsStyle(string $style, string $lettersCase = 'same'): void	Change naming style
setIsFormatted(bool $bool): void	Toggle formatted output
toJSONString(): string	Get JSON string
toJSONxString(): string	Get JSONx string
toJsonFile(string $fileName, string $path, bool $override = false): void	Save to file
Json::decode(string $jsonStr): Json	Decode a JSON string
Json::fromJsonFile(string $path): Json	Load from a JSON file