Symfony Controllers

When to use

• The user needs to write a Symfony controller or action method that handles an HTTP request and returns a response.
• The user needs a Symfony controller action to return JSON for an API endpoint.
• The user needs to read the request body or query string in a Symfony controller and map it to typed arguments or a DTO.

When NOT to use

• Do not put reusable domain or business logic inside a controller; controllers should stay thin and delegate to services.
• Do not use a controller for CLI commands, message handlers, or cron jobs that have no HTTP request/response cycle.

Core guidance