Validating File Uploads

The video tutorial covers file validation for server uploads, focusing on restricting file size and type using Multer. It demonstrates setting size limits in bytes and filtering file types with file filters. The tutorial includes testing these restrictions using Postman and introduces regular expressions for handling multiple file extensions. The video aims to equip viewers with the skills to implement robust file validation in their applications.

Why is it important to validate file uploads on a server?

• To ensure files are stored securely

• To prevent server overload and manage storage costs

• To improve server speed

• To enhance user experience

What property in Multer is used to set a maximum file size for uploads?

• maxSize

• fileFilter

• limits

• fileSize

In the context of file uploads, what does a 500 status code indicate?

• Successful upload

• File type mismatch

• Server error

• File size too large

Which Multer property is used to filter files based on their type?

• typeCheck

• typeFilter

• fileFilter

• fileType

What arguments does the fileFilter function in Multer receive?

• file, callback, error

• request, response, file

• file, error, response

• request, file, callback

What is the purpose of using regular expressions in file validation?

• To improve server performance

• To encrypt file data

• To match multiple file extensions

• To check file size

Which website is recommended for testing regular expressions?

• regex101.com

• regex.com

• regexlab.com

• regexworld.com

What does the dollar sign ($) signify in a regular expression?

• A special character

• End of a string

• A wildcard

• Start of a string

What message is displayed when a non-PDF file is uploaded to a PDF-only endpoint?

• File must be a PDF

• Please upload a PDF

• Invalid file type

• Upload failed

How can you test if a file type validation is working correctly?

• By uploading files with different extensions

• By checking server logs

• By uploading files of different sizes

• By using a debugger