# Doctrine Lexer [](https://github.com/doctrine/lexer/actions) Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers. This lexer is used in Doctrine Annotations and in Doctrine ORM (DQL). https://www.doctrine-project.org/projects/lexer.html
In case of an error, the API will return an error response containing a specific error code 400, 403 Failed and a user-friendly message. Refer to our API documentation for a comprehensive list of error codes and their descriptions.