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.
Learn how for both an input the 'multiple' attribute and with multiple input elements.
Create a download indicator by reading the body of the response.
Learn how to track progress and upload a CSS progress bar.
Make a POST request containing form data as the payload using Axios.
The XMLHttpRequest (XHR) object can be used to make and track upload progress.