How to implement api in Symfony?

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composer require symfony/serializer
composer require symfony/validator
composer require symfony/form
composer require symfony/security-csrf
composer require symfony/property-info
composer require symfony/yaml

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<?php

namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentRoutingAnnotationRoute;

class ApiController extends AbstractController
{
    /**
     * @Route("/api/endpoint", name="api_endpoint", methods={"POST"})
     */
    public function apiEndpoint()
    {
        // Implement your API logic here
    }
}

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use SymfonyComponentSerializerSerializer;
use SymfonyComponentSerializerEncoderJsonEncoder;
use SymfonyComponentSerializerNormalizerObjectNormalizer;

$encoders = [new JsonEncoder()];
$normalizers = [new ObjectNormalizer()];

$serializer = new Serializer($normalizers, $encoders);

$json = '{"name": "John"}';
$object = $serializer->deserialize($json, 'AppEntityUser', 'json');

$json = $serializer->serialize($object, 'json');

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use SymfonyComponentValidatorValidation;
use SymfonyComponentValidatorConstraints as Assert;

$validator = Validation::createValidator();

$constraint = new AssertCollection([
    'name' => new AssertNotBlank(),
]);

$violations = $validator->validate($requestData, $constraint);

if (count($violations) > 0) {
    // There are validation errors
}

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use SymfonyComponentFormForms;
use SymfonyComponentFormExtensionHttpFoundationHttpFoundationExtension;

$formFactory = Forms::createFormFactoryBuilder()
    ->addExtension(new HttpFoundationExtension())
    ->getFormFactory();

$form = $formFactory->createBuilder(FormType::class, $object)
    ->add('name')
    ->add('submit', SubmitType::class)
    ->getForm();

$form->handleRequest($request);

if ($form->isSubmitted() && $form->isValid()) {
    // Form is valid
}