File Upload with Progress Bar in JavaScript | Realtime Upload Tracker

In this video, you'll learn how to create a file upload system with a real-time progress bar using pure JavaScript. No libraries or frameworks required—just simple HTML, CSS, and vanilla JS to give you full control and understanding.

File uploads are an essential part of many modern web applications. Whether you're working on a CMS, user profile system, or an image-sharing platform, knowing how to implement file uploads with visual feedback can enhance your UI significantly.

We’ll walk through the HTML structure first, where we use a simple input file element, a button, and a styled progress bar to show live upload progress. Then, using JavaScript’s XMLHttpRequest, we send the file to the server while tracking the upload using the onprogress event.

This method is lightweight, efficient, and works across all modern browsers. You'll also learn how to calculate the uploaded percentage and reflect that visually through dynamic CSS updates to the progress bar.

For backend processing, you’ll need to connect the upload to a server endpoint (like Node.js, PHP, or Python), but this frontend logic works with any backend of your choice.

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