You can do this with a site speed service like NitroPack that offers intelligent concatenation features. That’s why you’ have to test and figure out if concatenation is right for you. As a result, browsers load and run them in the wrong order. The problem is that after concatenation, scripts can show up all over the new combined JavaScript file.
They must run script3 first, followed by script2 and finally - script1. In that case, browsers must load and run them in a specific order. Let’s say script1 depends on script2, which depends on script 3. These scripts often depend on one another to work.
Lots of things can go wrong, especially when combining JavaScript files.įor example, with some websites, you can find JavaScript in the code, framework, theme and plugins. Now, concatenation isn’t as straightforward as minification and compression.
#JAVASCRIPT MINIFY ONLINE CODE#
Since browsers have connection limitations, concatenation is also a good practice when it comes to code optimization. The benefit of having fewer files is that the browser has to make fewer HTTP requests. It consists of combining CSS or JavaScript files into just one CSS or JavaScript file. Compressed files have a content-encoding header, usually with a gzip or br value.Ĭoncatenation is another common technique for improving web performance. Minified files typically have “.min” in their name. To do so, open the Network tab (right-click and select “Inspect”) in your browser and look at the file names and response headers. You can also use the Network tab to see if files have been minified and compressed. Again, go over your providers’ documentation to see if this has been taken care of for you. Like minification, a few CDN providers (and hosting companies) automatically compress files on their servers. While gzip is the most popular compression method, there are lots of others out there.įor example, the Brotli algorithm has proven to be equally good, if not better, in some aspects. Here’s a great example of this process in action:Īs you can see, the text in brackets is repetitive, so gzip replaces it with a pointer. The benefit is that pointers use less space than text. Gzipping works by finding the repetitive strings and replacing them with pointers to the first instance of the string. In fact, people often use the term “gzipping” as a substitute for compression. The most popular compression tool is gzip. While minification removes unnecessary data from a file, compression rewrites the files’ binary code and encodes the information using fewer bits than the original. However, there’s a fundamental difference between the two. Both techniques essentially provide the same benefit, i.e., making files smaller. People often confuse minification and compression, which is understandable. The Difference Between Minification and Compression (Gzipping) Lots of CDN providers also automatically minify files on their servers. Most JavaScript libraries provide minified versions of their files by default. That’s why minification has become an industry standard over the last few years. But when you apply the process to large code files, the savings are significant. In this example, the actual size difference between the regular and minified version is tiny. When we run it through a CSS minifier, the same code looks like this: (Of course, they also help developers write and review code, but browsers don’t care about that.)įor example, here’s how an unminified CSS files looks: In that sense, all they do is bloat code files. Minification is the process of removing unnecessary elements from your website’s code without affecting its performance.Ī few examples of unnecessary elements are:īrowsers don’t need these to render the page. What is HTML, CSS and JavaScript Minification? If you aren’t interested in the “why” behind these techniques, skip ahead to the "Tools for HTML, CSS and JavaScript Minification section".Īnd for the easiest way to optimize your website’s code, go to "Automated Minification and Compression with NitroPack" įor now, let’s dive a bit deeper into minification. Good thing is, there are lots of tools that can help you with that. And while different, the smart move is getting them in one go. Minification - removing unnecessary parts like whitespace and comments from the code Ĭompression - applying algorithms to rewrite the files’ binary code, using fewer bits than the original.īoth are low effort, high reward optimizations. You can make code files lighter by applying two techniques: Reducing HTML, CSS and JavaScript file size is a crucial part speeding up your website.
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