Easy steps to download any file with code examples – master the Blob URL method now

Table of content

  1. Introduction
  2. Understanding the Blob URL method
  3. Step 1: Identify the download link
  4. Step 2: Create a Blob URL
  5. Step 3: Trigger the download using JavaScript
  6. Step 4: Verify the downloaded file
  7. Conclusion


So you want to learn how to download files like a pro? Well, you're in for a treat because I'm about to teach you an awesome method that you'll surely love!

Have you ever wanted to download a file from the internet but got stumped because you didn't know how? Or maybe you found a cool tool or app that you wanted to try out, but didn't know how to grab it from the website? Don't worry, I've got you covered!

In this guide, I'll be showing you how to master the Blob URL method. Now, you might be wondering what in the world is a "Blob URL"? Basically, it's a nifty trick that allows you to download any file from a website, even if it doesn't have a direct download link.

Trust me, once you learn this method, you'll be amazed at how easy it is to download files that you previously thought were impossible to get. So, let's dive in and discover how amazing it is to use Blob URLs to download files!

Understanding the Blob URL method

So, you want to learn about the Blob URL method? Well, you're in luck because it's a nifty little trick that can save you a lot of hassle when downloading files from the internet.

Basically, a Blob URL is a URL that points to a blob, which is just a data file that contains information about the file you want to download. These URLs can be created using JavaScript and can be used to download files of any type, including images, videos, and even PDF documents.

The amazing thing about Blob URLs is that they don't require any additional software or plugins to work. All you need is a web browser and a file to download. You can even use them in your own web applications to allow users to download files directly from your website.

To use the Blob URL method, you'll first need to create a Blob object that contains the data for the file you want to download. Once you have your Blob, you can create a URL to it using URL.createObjectURL(). From there, you can simply link to the Blob URL in your HTML or use it in any other way you would a regular download link.

Overall, the Blob URL method is a simple and effective way to download files from the internet. It's definitely worth learning how to use, especially if you download a lot of files or work with web applications on a regular basis. Trust me, once you start using Blob URLs, you'll wonder how you ever managed without them!

So, you're ready to download a file using the Blob URL method, but where do you start? Step one is identifying the download link, and let me tell you, it's not as difficult as it may seem.

First, navigate to the webpage where the file is located. It could be a document on Google Drive, a photo on Flickr, or any file on any website. Once you're there, right-click on the download button or link and select "Inspect Element." This will bring up the developer tools in your web browser.

Next, look for the code that contains the download link. It should have a ".pdf" or ".jpg" at the end, indicating the file type. Once you've found it, right-click on the link, and select "Copy Link Address." Congratulations, you've just identified the download link!

Now, let's move on to the exciting part: using the Blob URL method to download your file. Can you imagine how amazing it will be to have any file you want at your fingertips? So nifty!

Step 2: Create a Blob URL

Alrighty, folks, we've made it to step 2! Are ya still with me? Don't worry if you're feeling a little overwhelmed – this stuff can get tricky, but trust me, it's gonna be worth it in the end. So let's get started on creating a Blob URL.

First things first, let's define what a Blob URL is. Basically, it's a nifty way to convert a blob (Binary Large Object) into a link that can be used to download the file. How amazingd it be to just click on a link and download a file straight from your app? Well, with Blob URLs, you can make that happen.

So, how do we create a Blob URL? It's actually not too complicated. Here's the code you'll need:

const url = URL.createObjectURL(blob);

That's it! Just plug in your blob and BAM – you've got yourself a Blob URL. Now, just like with the blob, you'll want to store this URL in a variable for later use. Here's what that would look like:

const url = URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = url;
link.download = "filename.extension";

Let's break this down a bit. First, we create a new HTML a element, which we'll use as our download link. Then, we set the href attribute to be our new Blob URL. The download attribute sets the default filename and extension for the downloaded file – make sure to replace this with whatever you want the user to see. Next, we add the a element to the body of our document. Finally, we programmatically click on the a element to start the download.

And there you have it! Two easy steps down, one more to go. Stay tuned for the final step – it's a good one.

Step 3: Trigger the download using JavaScript

Alright, now that we've got our file ready to go, it's time to trigger the download using JavaScript. This is the fun part!

First, let's create an event listener that will activate our download function when the user clicks a button or a link. Here's an example of how to do this with jQuery:

$('#download-button').on('click', function() {
  // download function goes here

In this example, we're selecting an HTML element with the ID "download-button" and attaching a click event listener to it. When the user clicks the button, the function inside the curly braces will be executed.

Next, let's call the download function we created earlier:

$('#download-button').on('click', function() {

Here, we're passing the desired name for our file as a string argument to the downloadBlob function. When the download function is executed, the file will be downloaded with the specified name and extension.

That's it! How amazingd it be to create a nifty file download feature for your website using just a few lines of JavaScript? With this Blob URL method, you can easily allow users to download files without any extra plugins or libraries.

Step 4: Verify the downloaded file

Now that you've successfully downloaded your file using the Blob URL method, it's time to verify it! This step is crucial, especially if you're downloading a vital file that you need for work or school. The last thing you want is to spend hours downloading something only to realize it's corrupted or incomplete.

So how do you verify it? Well, there's a nifty little command you can use in Terminal called "md5." This command will generate a unique hash for your file, which you can compare to the hash provided by the source of the file.

Here's an example: let's say I downloaded a PDF file called "myresume.pdf" using the Blob URL method. I can open Terminal and navigate to the directory where the file was downloaded. Then, I can type in the command "md5 myresume.pdf" and hit enter. Terminal will generate a unique hash for my file, which I can compare to the hash provided by the source of the file.

If the hashes match, then you can be sure that your file is a perfect copy and is safe to use. How amazing is that?!

Overall, verifying your downloaded file is a crucial step that ensures your file is complete and safe to use. With the md5 command in Terminal, this step is super easy and quick to do. So don't skip it!


And that's it, folks! You have made it to the end of this nifty little guide on how to download any file using the Blob URL method. I hope you found this helpful and enjoyable to read.

Just remember, downloading files using the Blob URL method can be incredibly useful and save you tons of time. With just a few lines of code, you can download any file from the internet without the need for pesky third-party apps or software.

If you're still unsure about anything or want to learn more about the Blob URL method, there are plenty of online resources available to you. And who knows, maybe you'll even discover some new and exciting ways to utilize this powerful tool.

So what are you waiting for? Get out there and start downloading with the Blob URL method. Who knows just how amazingd it could be for you!

As a senior DevOps Engineer, I possess extensive experience in cloud-native technologies. With my knowledge of the latest DevOps tools and technologies, I can assist your organization in growing and thriving. I am passionate about learning about modern technologies on a daily basis. My area of expertise includes, but is not limited to, Linux, Solaris, and Windows Servers, as well as Docker, K8s (AKS), Jenkins, Azure DevOps, AWS, Azure, Git, GitHub, Terraform, Ansible, Prometheus, Grafana, and Bash.

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