Simple example of denormalizer

UserNormalizer.php

<?php

namespace App\Normalizer;

use App\Entity\User;
use Ramsey\Uuid\Uuid;
use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;

class UserNormalizer implements DenormalizerInterface
{
    public function denormalize($data, $class, $format = null, array $context = array())
    {
        $defaults = [
            'emailAddress' => '',
            'firstName' => '',
            'lastName' => '',
            'zipCode' => '',
        ];
        $data = array_merge($defaults, $data);

        return new User(
            Uuid::fromString($data['uuid']),
            $data['emailAddress'],
            $data['firstName'],
            $data['lastName'],
            $data['zipCode']
        );
    }

    public function supportsDenormalization($data, $type, $format = null)
    {
        return User::class === $type;
    }
}