Question 1

How do I validate query parameters with next-joi?

Accepted Answer

Define a Joi schema for the query key in the schemas object passed to validate. For example, use schemas.query with a Joi object to validate URL parameters, as outlined in the API section.

Question 2

Can next-joi handle file upload validation?

Accepted Answer

No, next-joi only validates body, headers, and query parameters as per the README. For file uploads, you'd need additional middleware or manual checks outside its scope.

Question 3

Is next-joi compatible with Next.js 13 app router?

Accepted Answer

The README doesn't specify compatibility with the app directory. Since it's designed for API routes, it might not work out-of-the-box with server components or new app router API routes without adjustments.

Question 4

How to customize error messages in next-joi?

Accepted Answer

Use the onValidationError callback to access the Joi validation error and send custom responses, such as detailed error messages or different status codes, as explained in the configuration examples.

Question 5

next-joi vs using Joi directly in Next.js handlers?

Accepted Answer

next-joi provides a middleware wrapper that centralizes validation logic, reducing boilerplate compared to manual Joi checks in each handler. However, it adds an extra dependency and may be overkill for simple use cases.

next-joi

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