Okay I used $request->request->get() to extract my values , like this :
$entityManager = $this->getDoctrine()->getManager();
$user = new User();
$user->setLogin($request->request->get('login'));
$user->setPassword($request->request->get('password'));
$entityManager->persist($user);
$entityManager->flush();
And then I serialize my values in a JSON object, it’s working perfectly ^^ Thanks for your help! ^^
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solved Symfony 4 – Send POST request with multipart/form-data