The html-minifier npm package is a highly configurable, well-tested, JavaScript-based HTML minifier, with lint-like capabilities. It compresses HTML files by removing unnecessary whitespace, comments, and other unneeded characters without changing the functionality of the HTML. This can result in faster page load times and reduced bandwidth usage.

What are html-minifier's main functionalities?

Minify HTML

This feature collapses whitespace and strips out unnecessary spaces and line breaks to minimize the HTML file size.

const htmlMinifier = require('html-minifier').minify;
let result = htmlMinifier('<p>      Some HTML     </p>', {collapseWhitespace: true});
console.log(result); // Output: '<p>Some HTML</p>'

Remove Comments

This feature removes HTML comments to reduce the file size.

const htmlMinifier = require('html-minifier').minify;
let result = htmlMinifier('<!-- This is a comment --> <div>Content</div>', {removeComments: true});
console.log(result); // Output: '<div>Content</div>'

Remove Optional Tags

This feature removes optional tags like <html>, <head>, <body>, and <colgroup> when they are not necessary.

const htmlMinifier = require('html-minifier').minify;
let result = htmlMinifier('<html><head><title>Title</title></head><body><p>Content</p></body></html>', {removeOptionalTags: true});
console.log(result); // Output: '<title>Title</title><p>Content</p>'

Minify CSS

This feature minifies inline CSS reducing its size by removing unnecessary characters and whitespace.

const htmlMinifier = require('html-minifier').minify;
let result = htmlMinifier('<style>    .class { font-size: 18px; }    </style>', {minifyCSS: true});
console.log(result); // Output: '<style>.class{font-size:18px}</style>'

Minify JavaScript

This feature minifies inline JavaScript code by removing unnecessary characters and whitespace.

const htmlMinifier = require('html-minifier').minify;
let result = htmlMinifier('<script>    var name = "Your Name";    </script>', {minifyJS: true});
console.log(result); // Output: '<script>var name="Your Name";</script>'

Other packages similar to html-minifier

Readme

Source

HTMLMinifier is a highly configurable, well-tested, Javascript-based HTML minifier, with lint-like capabilities.

See corresponding blog post for all the gory details of how it works, description of each option, testing results and conclusions.

Test suite is available online.

Also see corresponding Ruby wrapper, and for Node.js, Grunt plugin & Gulp module.

How does HTMLMinifier compare to another solution — HTML Minifier from Will Peavy (1st result in google search for "html minifier") as well as htmlcompressor.com?

Site	Original size (KB)	HTMLMinifier (KB)	Will Peavy (KB)	htmlcompressor.com (KB)
HTMLMinifier page	48.8	37.3	43.3	41.9
ES6 table	117.9	79.9	92	91.9
MSN	156.6	133	145	138.3
Stackoverflow	200.4	159.5	168.3	163.3
Amazon	245.9	206.3	225	218.5
Wikipedia	401.4	380.6	396.3	n/a
Eloquent Javascript	869.5	830	872	n/a

Options Quick Reference

Option	Description	Default
`removeComments`	Strip HTML comments	`false`
`removeCommentsFromCDATA`	Strip HTML comments from scripts and styles	`false`
`removeCDATASectionsFromCDATA`	Remove CDATA sections from script and style elements	`false`
`collapseWhitespace`	Collapse white space that contributes to text nodes in a document tree.	`false`
`conservativeCollapse`	Always collapse to 1 space (never remove it entirely). Must be used in conjunction with `collapseWhitespace=true`	`false`
`collapseBooleanAttributes`	Omit attribute values from boolean attributes	`false`
`removeAttributeQuotes`	Remove quotes around attributes when possible.	`false`
`removeRedundantAttributes`	Remove attributes when value matches default.	`false`
`useShortDoctype`	Replaces the doctype with the short (HTML5) doctype	`false`
`removeEmptyAttributes`	Remove all attributes with whitespace-only values	`false`
`removeOptionalTags`	Remove unrequired tags	`false`
`removeEmptyElements`	Remove all elements with empty contents	`false`
`lint`	Toggle linting	`false`
`keepClosingSlash`	Keep the trailing slash on singleton elements	`false`
`caseSensitive`	Treat attributes in case sensitive manner (useful for SVG; e.g. viewBox)	`false`
`minifyJS`	Minify Javascript in script elements and on* attributes (uses UglifyJS)	`false` (could be `true`, `false`, `Object` (options))
`minifyCSS`	Minify CSS in style elements and style attributes (uses clean-css)	`false` (could be `true`, `false`, `Object` (options))
`ignoreCustomComments`	Array of regex'es that allow to ignore certain comments, when matched	`[ ]`
`processScripts`	Array of strings corresponding to types of script elements to process through minifier (e.g. "text/ng-template", "text/x-handlebars-template", etc.)	`[ ]`

Chunks of markup can be ignored by wrapping them with .

Installation Instructions

From NPM for use as a command line app:

npm install html-minifier -g

From NPM for programmatic use:

npm install html-minifier

From Git:

git clone git://github.com/kangax/html-minifier.git
cd html-minifier
npm link .

Usage

For command line usage please see html-minifier --help

Node.js

require('html-minifier')

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Last updated on 06 Jul 2014

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