Bookmarklet

There are many great things of being a Frontend Developer. One of it is your knowledge of DOM API able to "unlock" features that is not provided by your site.

For instance, one of the things I do the most is to speed up video play speed, by using the following script in browser console:

js
document.querySelector('video').playbackRate = 2;

However, being a lazy programmer, how do you able to make that snippets just one click away?

One way is to write a browser extension, which one day, you will have time to learn how to write.

Another way is to write a bookmarklet.

Bookmarklet is simply saving your JS code in a bookmark so you can execute it.

For example, the bookmarklet-ized script of that previous script will be:

js
javascript: (function() {
document.querySelector('video').playbackRate = 2;
})();

And how you use that is to add a bookmark in your browser, by setting the script as the URL.

Adding a bookmark with JavaScript code as URL

Now faster video is just a click a way!

You can even parameterized your bookmarklet with the prompt function:

js
javascript: (function() {
const playRate = prompt('How fast you want the video to be? (e.g. 2)');
if (playRate) {
document.querySelector('video').playbackRate = Number(playRate);
}
})();

Topics

  • javascript