It might be useful in many cases to manually create a JWT token for a given user, after confirming user registration by mail for instance. To achieve this, use the lexik_jwt_authentication.jwt_manager service directly:

namespace App\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\Security\Core\User\UserInterface;
use Lexik\Bundle\JWTAuthenticationBundle\Services\JWTTokenManagerInterface;
class ApiController extends Controller
    public function getTokenUser(UserInterface $user, JWTTokenManagerInterface $JWTManager)
        // ...
        return new JsonResponse(['token' => $JWTManager->create($user)]);
This dispatches the Events::JWT_CREATED, Events::JWT_ENCODED
events and returns a JWT token, but the
Events::AUTHENTICATION_SUCCESS event is not dispatched, you need to
create and format the response by yourself.
For manually authenticating an user and returning the same response as
your login form:
        
public function fooAction(UserInterface $user)
    $authenticationSuccessHandler = $this->container->get('lexik_jwt_authentication.handler.authentication_success');
    return $authenticationSuccessHandler->handleAuthenticationSuccess($user);
You can also pass an existing JWT to the handleAuthenticationSuccess
method:
        
$jwt = $this->container->get('lexik_jwt_authentication.jwt_manager')->create($user);
return $authenticationSuccessHandler->handleAuthenticationSuccess($user, $jwt);
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