jms/serializer-bundle

D:\webprojects\test-api-project>composer require jms/serializer-bundle
Using version ^3.4 for jms/serializer-bundle
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Restricting packages listed in "symfony/symfony" to "4.3.*"

Prefetching 16 packages 
  - Downloading (100%)  

Package operations: 16 installs, 0 updates, 0 removals
  - Installing hoa/exception (1.17.01.16): Loading from cache
  - Installing hoa/event (1.17.01.13): Loading from cache
  - Installing hoa/consistency (1.17.05.02): Loading from cache
  - Installing hoa/visitor (2.17.01.16): Loading from cache
  - Installing hoa/ustring (4.17.01.16): Loading from cache
  - Installing hoa/protocol (1.17.01.14): Loading from cache
  - Installing hoa/zformat (1.17.01.10): Loading from cache
  - Installing hoa/iterator (2.17.01.10): Loading from cache
  - Installing hoa/compiler (3.17.08.08): Loading from cache
  - Installing hoa/regex (1.17.01.13): Loading from cache
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  - Installing hoa/stream (1.17.02.21): Loading from cache
  - Installing hoa/file (1.17.07.11): Loading from cache
  - Installing jms/metadata (2.1.0): Loading from cache
  - Installing jms/serializer (3.3.0): Loading from cache
  - Installing jms/serializer-bundle (3.4.1): Loading from cache
Writing lock file
Generating autoload files
ocramius/package-versions: Generating version class...
ocramius/package-versions: ...done generating version class
Symfony operations: 1 recipe (3bdaac2ac8821bc8af3d710ff51a1686)
  -  WARNING  jms/serializer-bundle (>=3.0): From github.com/symfony/recipes-contrib:master
    The recipe for this package comes from the "contrib" repository, which is open to community contributions.
    Review the recipe at https://github.com/symfony/recipes-contrib/tree/master/jms/serializer-bundle/3.0

    Do you want to execute this recipe?
    [y] Yes
    [n] No
    [a] Yes for all packages, only for the current installation session
    [p] Yes permanently, never ask again for this project
    (defaults to n): y
  - Configuring jms/serializer-bundle (>=3.0): From github.com/symfony/recipes-contrib:master
Executing script cache:clear [OK]
Executing script assets:install public [OK]

Some files may have been created or updated to configure your new packages.
Please review, edit and commit them: these files are yours.

Trois points important

1. Clause use : use JMS\Serializer\SerializerInterface;
2. Injection : public function check(…, SerializerInterface $serializer )
3. Sérialisation : $string = $serializer→serialize($objet, 'json');

<?php
namespace App\Controller;
...
use JMS\Serializer\SerializerInterface;
...
class CheckVersionController extends AbstractController
{
     /**
      * @Route("/api/checkv", name="api_checkversion")
      */
    public function check(Request $request, SerializerInterface $serializer )
    {
       // Création d'un objet
        $proj = new Projects();
        $proj->setName('Test');
 
        // Sérialisation de l'Objet
        $data = $serializer->serialize($proj, 'json');
 
        // Envois de la réponse
        $response = new Response($data);
        $response->headers->set('Content-Type', 'application/json');
        return $response;
    }
}