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Example code of guuzen/json-schema-codegen

Informations about the package json-schema-codegen

The Problem

When your application communicates with external systems - APIs, message queues, event streams - you typically define data contracts using JSON Schema. On the PHP side, you represent those contracts as DTO classes with typed properties.

The problem is keeping both in sync. Every time the schema changes, you have to manually update the corresponding PHP class: rename properties, adjust types, add or remove fields. This is repetitive, error-prone, and easy to forget. The schema and the code silently drift apart, and type mismatches only surface at runtime.

The Solution

JSON Schema Codegen generates PHP DTO classes directly from your JSON Schema files. Run the generator after any schema change and your PHP classes are always up to date - no manual editing required.

The generator maps JSON Schema types to precise PHPDoc annotations that static analysis tools like PHPStan understand:

Requirements

Installation

Quick Start

Create a PHP script that configures and runs the generator:

Run it with php generate.php whenever your schemas change.

Configuration

Option Type Description
baseNamespace string Root namespace for all generated classes
schemaPath string Absolute path to the directory containing your schema files
outputPath string Absolute path to the directory where generated PHP files are written
schemaSuffix string File extension used to identify schema files; also selects the decoder (.json or .yaml)
undefinedPath string Schema path (relative to schemaPath) representing an absent value, referenced by non-required properties so absence is distinguishable from null
typeMappings array<string, class-string> Optional. Maps a schema path (relative to schemaPath) to an existing class to reference instead of generating, e.g. ['DateTimeImmutable.json' => DateTimeImmutable::class]

Schema files in subdirectories of schemaPath produce classes in sub-namespaces. For example, schemas/billing/Address.json generates App\Dto\billing\Address.

Example

Given this schema at schemas/Product.json:

The generator produces output/Product.php:

Cross-file references via $ref are also resolved. Given schemas/Order.json:

The generator produces:

YAML Support

YAML schema files are supported out of the box. Install symfony/yaml and set schemaSuffix to .yaml - create() selects the matching decoder from the suffix automatically:

For full control, use NetteFilesGeneratorFactory::assemble(...) directly.

Running Tests

All versions of json-schema-codegen with dependencies

PHP Build Version
Package Version
Requires league/uri Version ^7.8
php Version >=8.4 <8.6
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