Receive form data that is url-encoded or of type 'multipart/form-data'
URL parameters are data in string format that can be added to the end of a URL.
To do so, you need to make your calculations conditional upon data type.
Minimize server requests by validating file size before uploading.
You can use Express as a static file server for a HTML website or SPA.
Using the Notificaitons API, you can send system-level notifications to a user.
Express provides a simple sytnax for creating a REST API in Node.js.
You can use Promise.all or Promise.allSettled to wait for multiple requests to complete.
How to emails to one or more addresses and including attachments.
Multer allows files and any additional form data to be easily parsed from a request.