Validation Challenge

The video tutorial guides users through adding validation to an avatar upload route. It covers setting file size limits and restricting file types to JPG, JPEG, and PNG using Multer. The tutorial explains how to implement these validations, test them using Postman, and handle errors effectively. The next lesson will focus on improving error responses by sending JSON instead of HTML.

Describe the process of validating the uploaded file type.

What error message is displayed if a non-image file is uploaded?