HTML cleaner and beautifier

Installation

Install locally with npm:

$ npm install clean-html

Or globally:

$ npm install -g clean-html

Usage

In a script

const cleaner = require('clean-html');
const fs = require('fs');

fs.readFile('foo.html', 'utf8', (err, input) => {
    cleaner.clean(input, output => console.log(output));
});

Options can be provided like so:

const options = {
    'break-around-comments': false,
    'decode-entities': true,
    'remove-tags': ['b', 'i', 'center', 'font'],
    'wrap': 80
};

cleaner.clean(input, options, output => {...});

From the command line

If installed globally, just run clean-html. Otherwise, run npx clean-html.

Input can be piped from stdin:

$ echo '<h1>Hello, World!</h1>' | clean-html
$ cat foo.html | clean-html

Or you can provide a filename as the first argument:

$ clean-html foo.html

Output can be redirected to another file:

$ clean-html foo.html > bar.html

Or you can edit the file in place:

$ clean-html foo.html --in-place

Other options can be provided like so:

$ clean-html foo.html \
    --break-around-comments \
    --decode-entities false \
    --remove-tags b,i,center,font \
    --wrap 80

Array type option values should be separated by commas. Boolean type options are disabled if followed by false and enabled if followed by true or nothing.

Options

allow-attributes-without-values

Allows attributes to be output without values. For example, checked instead of checked="".

Please set to true for Angular components or for <input> elements.

Type: Boolean
Default: false

break-around-comments

Adds line breaks before and after comments.

Type: Boolean
Default: true

break-around-tags

Tags that should have line breaks added before and after.

Type: Array of strings
Default: ['body', 'blockquote', 'br', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'hr', 'link', 'meta', 'p', 'table', 'title', 'td', 'tr']

decode-entities

Replaces HTML entities with their decoded equivalents. e.g., if true then   will be replaced by a space character.

Type: Boolean
Default: false

indent

The string to use for indentation. e.g., a tab character or one or more spaces.

Type: String
Default: ' ' (two spaces)

lower-case-tags

Converts all tag names to lower case.

Please set to false for Angular components.

Type: Boolean
Default: true

lower-case-attribute-names

Converts all attribute names to lower case.

Please set to false for Angular components.

Type: Boolean
Default: true

preserve-tags

Tags that should be left alone. i.e., content inside these tags will not be formatted or indented.

Type: Array of strings
Default: ['script', 'style']

remove-attributes

Attributes to remove from markup.

Type: Array of strings or regular expressions
Default: ['align', 'bgcolor', 'border', 'cellpadding', 'cellspacing', 'color', 'height', 'target', 'valign', 'width']

remove-comments

Removes comments.

Type: Boolean
Default: false

remove-empty-tags

Tags to remove from markup if empty.

Type: Array of strings or regular expressions
Default: []

remove-tags

Tags to always remove from markup. Nested content is preserved.

Type: Array of strings or regular expressions
Default: ['center', 'font']

wrap

The column number where lines should wrap. Set to 0 to disable line wrapping.

Type: Integer
Default: 120

Adding values to option lists

These options exist for your convenience.

add-break-around-tags

Additional tags to include in break-around-tags.

Type: Array of strings
Default: null

add-remove-attributes

Additional attributes to include in remove-attributes.

Type: Array of strings
Default: null

add-remove-tags

Additional tags to include in remove-tags.

Type: Array of strings
Default: null