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Yes, it is possible to use both MongoDB and MySQL in a NestJS project. NestJS offers support for multiple databases, and you can configure your project to use both MongoDB and MySQL at the same time. You can create separate modules for each database and use them accordingly in your project. However, keep in mind that using multiple databases can increase the complexity of your project and may require more resources to run efficiently. It is important to consider the specific requirements of your project before deciding to use multiple databases.