JsonFicator

Framework-agnostic PHP library that converts natural language into structured data (arrays or PHP models) according to a schema, using LLM providers (OpenAI-compatible).

Features

• Schema-driven extraction — define the shape of output via PHP arrays or classes
• Two schema resolvers — ArraySchemaResolver for inline syntax, ClassSchemaResolver for reflection-based schemas
• OpenAI strict structured outputs — generates JSON Schema with additionalProperties: false for deterministic results
• PHP 8 Attributes — mark properties with #[JsonFicatorDescription], #[JsonFicatorRequired], #[JsonFicatorOptional]
• Immutable result — JsonFicatorResult with toArray(), toJson(), toModel()
• Per-call options — JsonFicatorOptions with withModel(), withTemperature(), withMaxTokens()
• Extensible — swap LLM provider via LLMProviderInterface
• Modern PHP — declare(strict_types=1), readonly properties, named arguments, PHP 8.2+

Installation

composer require jsonficator/jsonficator

You also need a PSR-18 HTTP client (e.g. Guzzle) in your project:

composer require guzzlehttp/guzzle

Quick Start

Array schema

<?php

use JsonFicator\JsonFicator;
use JsonFicator\Provider\OpenAIProvider;

$jsonFicator = new JsonFicator(
    new OpenAIProvider(['key' => 'sk-...'])
);

$result = $jsonFicator->toJson(
    'My car is a red Toyota Camry from 2020.',
    ['brand' => 'string', 'model' => 'string', 'year' => 'int', 'color' => '?string']
);

print_r($result->toArray());
// ['brand' => 'Toyota', 'model' => 'Camry', 'year' => 2020, 'color' => 'red']

PHP model schema

<?php

use JsonFicator\IJsonFicatorModel;
use JsonFicator\Attribute\JsonFicatorDescription;
use JsonFicator\Attribute\JsonFicatorRequired;

final class Car implements IJsonFicatorModel
{
    #[JsonFicatorDescription('Vehicle manufacturer')]
    public string $brand;

    #[JsonFicatorDescription('Specific model name')]
    public string $model;

    #[JsonFicatorRequired]
    public int $year;

    #[JsonFicatorDescription('Optional paint color')]
    public ?string $color = null;
}

$jsonFicator = new JsonFicator(
    new OpenAIProvider(['key' => 'sk-...'])
);

$result = $jsonFicator->toModel(
    'My car is a red Toyota Camry from 2020.',
    Car::class
);

$car = $result->toModel(); // instance of Car

Nested models

<?php

use JsonFicator\IJsonFicatorModel;

final class Owner implements IJsonFicatorModel
{
    public string $name;
    public ?string $phone = null;
}

final class Car implements IJsonFicatorModel
{
    public string $brand;
    public Owner $owner;
}

$result = $jsonFicator->toModel(
    'John owns a Ford. His phone is +1-555-1234.',
    Car::class
);

Configuration

OpenAIProvider

$provider = new OpenAIProvider([
    'host'   => 'https://api.openai.com/v1', // or any OpenAI-compatible endpoint
    'key'    => 'sk-...',                    // or set JSONFICATOR_OPENAI_API_KEY env var
    'model'  => 'gpt-4o',
    'strict' => true,                        // JSON Schema strict mode
]);

Per-call options

use JsonFicator\JsonFicatorOptions;

$options = (new JsonFicatorOptions())
    ->withModel('gpt-4o-mini')
    ->withTemperature(0.1)
    ->withMaxTokens(512);

$result = $jsonFicator->toJson($text, $schema, $options);

Schema Syntax (Array)

Syntax	Meaning
string	Non-nullable string
?string	Nullable string
int	Integer
float	Float / double
bool	Boolean
array	Untyped array
array<string>	Array of strings
array<int>	Array of integers
array<array>	Nested array of objects

Attributes

• #[JsonFicatorDescription('...')] — adds description to the JSON Schema field
• #[JsonFicatorRequired] — marks property as required (default for non-nullable)
• #[JsonFicatorOptional] — marks property as optional even if type is non-nullable

Testing

# Unit tests only
composer run test:unit

# Integration tests (requires JSONFICATOR_OPENAI_API_KEY)
composer run test:integration

# All tests
composer run test

Architecture

See ARCHITECTURE.md for design decisions and internal pipeline.

License

MIT