Minifying files with Node.js require the use of specific libraries. Two popular options are UglifyJS for JavaScript files and html-minifier for HTML files.
JS Files:
1. First, install UglifyJS via npm:
```
npm install uglify-js -g
```
1. Then you can minify your file with a command like this:
```
uglifyjs -o file.min.js
```
HTML Files:
1. Install html-minifier via npm:
```
npm install html-minifier -g
```
1. Then, you can minify an html file with a command like:
```
html-minifier —collapse-whitespace —remove-comments —remove-optional-tags —remove-redundant-attributes —remove-script-type-attributes —remove-tag-whitespace —use-short-doctype —minify-css true —minify-js true —process-scripts [Comma separated list of script types to process] -o ./dest/index.html ./src/index.html
```
Minify CSS Files:
For minifying CSS files, you can use clean-css.
1. Install it via npm:
```
npm install clean-css-cli -g
```
1. You can minify a css file:
```
cleancss -o styles.min.css styles.css
```
Apart from that, there are many task runners like grunt, gulp which can be used to automate the minification process. You install specific plugins for these task runners which can minify your code.
You may also use webpack, parcel, rollup, etc. bundlers which minify your code in production mode.
This standalone libraries and tools can be used in a server, a CLI application, etc. However, if the aim is to minify assets in a web application consider using a bundler such as Webpack or Parcel. These tools manage asset minification out of the box, and they are considered the industry standard for modern web development.
