specdocular/php-json-schema

PHP implementation of JSON Schema (Draft 2020-12)

v0.1.0 2026-02-12 18:50 UTC

Requires

• php: ^8.2
• webmozart/assert: ^1.11

Requires (Dev)

• friendsofphp/php-cs-fixer: ^3.8.0
• justinrainbow/json-schema: ^6.0
• pestphp/pest: ^3.2
• pestphp/pest-plugin-type-coverage: ^3.0
• phpstan/phpstan: ^2.1
• phpstan/phpstan-phpunit: ^2.0
• phpstan/phpstan-strict-rules: ^2.0
• phpstan/phpstan-webmozart-assert: ^2.0
• rector/rector: ^2.0
• slevomat/coding-standard: ^8.15
• squizlabs/php_codesniffer: *
• vimeo/psalm: ^6.0.0

MIT

• Mohammad Alavi

• json
• schema
• validation
• json-schema
• draft-2020-12

README

A type-safe, fluent PHP implementation of JSON Schema Draft 2020-12.

Installation

composer require specdocular/php-json-schema

Usage

Build JSON Schema definitions using a fluent, type-safe API:

use Specdocular\JsonSchema\Draft202012\StrictFluentDescriptor;
use Specdocular\JsonSchema\Draft202012\Keywords\Properties\Property;

$schema = StrictFluentDescriptor::object()
    ->properties(
        Property::create('name', StrictFluentDescriptor::string()->minLength(1)),
        Property::create('email', StrictFluentDescriptor::string()->format('email')),
        Property::create('age', StrictFluentDescriptor::integer()->minimum(0)),
    )
    ->required('name', 'email');

// Compile to array
$compiled = $schema->compile();

// Or encode directly to JSON
$json = json_encode($schema, JSON_PRETTY_PRINT);

Strict vs Loose Descriptors

• StrictFluentDescriptor (recommended) — provides type-specific method autocomplete. Methods like minLength() are only available on string schemas, minimum() only on numeric schemas, etc.
• LooseFluentDescriptor — exposes all keywords on every schema. Useful when building schemas with multiple types.

Features

• Full JSON Schema Draft 2020-12 support (all 50 keywords, 7 vocabularies)
• Type-safe fluent API with IDE autocomplete
• Extensible keyword and vocabulary system
• Built-in schema validation (VocabularyValidator, MetaSchemaValidator)
• Framework-agnostic — no dependencies on Laravel or any framework

Note: This library builds JSON Schema definitions. It does not validate data against schemas — use a validation library like justinrainbow/json-schema for that.

Related Packages

Package	Description
specdocular/php-openapi	Object-oriented OpenAPI 3.1.x builder (uses this package)
specdocular/laravel-rules-to-schema	Convert Laravel validation rules to JSON Schema (uses this package)
specdocular/laravel-openapi	Laravel integration for OpenAPI generation

License

MIT. See LICENSE for details.