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And now let's move on to validation, for example, I will take a fairly popular library Yup.
And now let's put everything together, and get a lightweight and flexible localization mechanism. And we will collect everything in place at the time of error handling, since Fastify is already able to handle exceptions out of the box, and using the setErrorHandler we can customize it, which will allow us to check if the error is an instance of the HttpError class, then try to check for slots, and send a message to the user.