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Gathering detailed insights and metrics for js-beautify

js-beautify

Beautifier for javascript

1.15.1

8,642

MIT

JavaScript

27.54 kB

823,558,390

Installations

npm install js-beautify

Pull Requests

Open

20

Total

740

Closed

184

Merged

536

Issues

Open

378

Total

1,580

Closed

1,202

Releases

v1.15.1 🌈

v1.15.1

Published on 16 Feb 2024

v1.15.0 🌈

v1.15.0

Published on 16 Feb 2024

v1.14.11 🌈

v1.14.11

Published on 29 Dec 2023

v1.14.9 🌈

v1.14.9

Published on 15 Aug 2023

v1.14.8 🌈

v1.14.8

Published on 01 Jun 2023

v1.14.6 🌈

v1.14.6

Published on 21 Aug 2022

View all 25 releases

Developer

beautifier

Developer Guide

BETA

Module System

CommonJS

Min. Node Version

>=14

Typescript Support

No

Node Version

18.19.0

NPM Version

10.4.0 Statistics

8,642 Stars

3,256 Commits

1,389 Forks

211 Watching

13 Branches

214 Contributors

Updated on 28 Nov 2024

Bundle Size

132.00 kB

Minified

27.54 kB

Minified + Gzipped

Bundlephobia

Languages

JavaScript (42.73%)

HTML (35.95%)

Python (15.5%)

Mustache (2.68%)

Shell (2.63%)

Makefile (0.3%)

CSS (0.2%)

Total Downloads

Cumulative downloads

Total Downloads

823,558,390

Last day

-4.4%

830,845

Compared to previous day

Last week

2.9%

4,673,610

Compared to previous week

Last month

8.7%

19,640,831

Compared to previous month

Last year

16.4%

203,973,040

Compared to previous year

Daily Downloads

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

config-chain editorconfig glob js-cookie nopt

Dev Dependencies

ansi-regex benchmark codemirror jquery jshint minimist mocha mustache requirejs serve strip-ansi webpack webpack-cli

Versions

JS Beautifier

This little beautifier will reformat and re-indent bookmarklets, ugly JavaScript, unpack scripts packed by Dean Edward’s popular packer, as well as partly deobfuscate scripts processed by the npm package javascript-obfuscator.

Open beautifier.io to try it out. Options are available via the UI.

Contributors Needed

I'm putting this front and center above because existing owners have very limited time to work on this project currently. This is a popular project and widely used but it desperately needs contributors who have time to commit to fixing both customer facing bugs and underlying problems with the internal design and implementation.

If you are interested, please take a look at the CONTRIBUTING.md then fix an issue marked with the "Good first issue" label and submit a PR. Repeat as often as possible. Thanks!

Installation

You can install the beautifier for Node.js or Python.

Node.js JavaScript

You may install the NPM package js-beautify. When installed globally, it provides an executable js-beautify script. As with the Python script, the beautified result is sent to stdout unless otherwise configured.

1$ npm -g install js-beautify
2$ js-beautify foo.js

You can also use js-beautify as a node library (install locally, the npm default):

1$ npm install js-beautify

Node.js JavaScript (vNext)

The above install the latest stable release. To install beta or RC versions:

1$ npm install js-beautify@next

Web Library

The beautifier can be added on your page as web library.

JS Beautifier is hosted on two CDN services: cdnjs and rawgit.

To pull the latest version from one of these services include one set of the script tags below in your document:

1<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.15.1/beautify.js"></script>
2<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.15.1/beautify-css.js"></script>
3<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.15.1/beautify-html.js"></script>
4
5<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.15.1/beautify.min.js"></script>
6<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.15.1/beautify-css.min.js"></script>
7<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.15.1/beautify-html.min.js"></script>

Example usage of a JS tag in html:

1<!DOCTYPE html>
2<html lang="en">
3  <body>
4
5. . .
6
7    <script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.15.1/beautify.min.js"></script>
8    <script src="script.js"></script>
9  </body>
10</html>

Older versions are available by changing the version number.

Disclaimer: These are free services, so there are no uptime or support guarantees.

Python

To install the Python version of the beautifier:

1$ pip install jsbeautifier

Unlike the JavaScript version, the Python version can only reformat JavaScript. It does not work against HTML or CSS files, but you can install css-beautify for CSS:

1$ pip install cssbeautifier

Usage

You can beautify JavaScript using JS Beautifier in your web browser, or on the command-line using Node.js or Python.

Web Browser

Open beautifier.io. Options are available via the UI.

Web Library

After you embed the <script> tags in your html file, they expose three functions: js_beautify, css_beautify, and html_beautify

Example usage of beautifying a json string:

1const options = { indent_size: 2, space_in_empty_paren: true }
2
3const dataObj = {completed: false,id: 1,title: "delectus aut autem",userId: 1,}
4
5const dataJson = JSON.stringify(dataObj)
6
7js_beautify(dataJson, options)
8
9/* OUTPUT
10{
11  "completed": false,
12  "id": 1,
13  "title": "delectus aut autem",
14  "userId": 1,
15}
16*/

Node.js JavaScript

When installed globally, the beautifier provides an executable js-beautify script. The beautified result is sent to stdout unless otherwise configured.

1$ js-beautify foo.js

To use js-beautify as a node library (after install locally), import and call the appropriate beautifier method for JavaScript (JS), CSS, or HTML. All three method signatures are beautify(code, options). code is the string of code to be beautified. options is an object with the settings you would like used to beautify the code.

The configuration option names are the same as the CLI names but with underscores instead of dashes. For example, --indent-size 2 --space-in-empty-paren would be { indent_size: 2, space_in_empty_paren: true }.

1var beautify = require('js-beautify/js').js,
2    fs = require('fs');
3
4fs.readFile('foo.js', 'utf8', function (err, data) {
5    if (err) {
6        throw err;
7    }
8    console.log(beautify(data, { indent_size: 2, space_in_empty_paren: true }));
9});

If you are using ESM Imports, you can import js-beautify like this:

1// 'beautify' can be any name here.
2import beautify from 'js-beautify';
3
4beautify.js(data, options);
5beautify.html(data, options);
6beautify.css(data, options);

Python

After installing, to beautify using Python:

1$ js-beautify file.js

Beautified output goes to stdout by default.

To use jsbeautifier as a library is simple:

1import jsbeautifier
2res = jsbeautifier.beautify('your JavaScript string')
3res = jsbeautifier.beautify_file('some_file.js')

...or, to specify some options:

1opts = jsbeautifier.default_options()
2opts.indent_size = 2
3opts.space_in_empty_paren = True
4res = jsbeautifier.beautify('some JavaScript', opts)

The configuration option names are the same as the CLI names but with underscores instead of dashes. The example above would be set on the command-line as --indent-size 2 --space-in-empty-paren.

Options

These are the command-line flags for both Python and JS scripts:

1CLI Options:
2  -f, --file       Input file(s) (Pass '-' for stdin)
3  -r, --replace    Write output in-place, replacing input
4  -o, --outfile    Write output to file (default stdout)
5  --config         Path to config file
6  --type           [js|css|html] ["js"] Select beautifier type (NOTE: Does *not* filter files, only defines which beautifier type to run)
7  -q, --quiet      Suppress logging to stdout
8  -h, --help       Show this help
9  -v, --version    Show the version
10
11Beautifier Options:
12  -s, --indent-size                 Indentation size [4]
13  -c, --indent-char                 Indentation character [" "]
14  -t, --indent-with-tabs            Indent with tabs, overrides -s and -c
15  -e, --eol                         Character(s) to use as line terminators.
16                                    [first newline in file, otherwise "\n]
17  -n, --end-with-newline            End output with newline
18  --editorconfig                    Use EditorConfig to set up the options
19  -l, --indent-level                Initial indentation level [0]
20  -p, --preserve-newlines           Preserve line-breaks (--no-preserve-newlines disables)
21  -m, --max-preserve-newlines       Number of line-breaks to be preserved in one chunk [10]
22  -P, --space-in-paren              Add padding spaces within paren, ie. f( a, b )
23  -E, --space-in-empty-paren        Add a single space inside empty paren, ie. f( )
24  -j, --jslint-happy                Enable jslint-stricter mode
25  -a, --space-after-anon-function   Add a space before an anonymous function's parens, ie. function ()
26  --space-after-named-function      Add a space before a named function's parens, i.e. function example ()
27  -b, --brace-style                 [collapse|expand|end-expand|none][,preserve-inline] [collapse,preserve-inline]
28  -u, --unindent-chained-methods    Don't indent chained method calls
29  -B, --break-chained-methods       Break chained method calls across subsequent lines
30  -k, --keep-array-indentation      Preserve array indentation
31  -x, --unescape-strings            Decode printable characters encoded in xNN notation
32  -w, --wrap-line-length            Wrap lines that exceed N characters [0]
33  -X, --e4x                         Pass E4X xml literals through untouched
34  --good-stuff                      Warm the cockles of Crockford's heart
35  -C, --comma-first                 Put commas at the beginning of new line instead of end
36  -O, --operator-position           Set operator position (before-newline|after-newline|preserve-newline) [before-newline]
37  --indent-empty-lines              Keep indentation on empty lines
38  --templating                      List of templating languages (auto,django,erb,handlebars,php,smarty,angular) ["auto"] auto = none in JavaScript, all in HTML

Which correspond to the underscored option keys for both library interfaces

defaults per CLI options

1{
2    "indent_size": 4,
3    "indent_char": " ",
4    "indent_with_tabs": false,
5    "editorconfig": false,
6    "eol": "\n",
7    "end_with_newline": false,
8    "indent_level": 0,
9    "preserve_newlines": true,
10    "max_preserve_newlines": 10,
11    "space_in_paren": false,
12    "space_in_empty_paren": false,
13    "jslint_happy": false,
14    "space_after_anon_function": false,
15    "space_after_named_function": false,
16    "brace_style": "collapse",
17    "unindent_chained_methods": false,
18    "break_chained_methods": false,
19    "keep_array_indentation": false,
20    "unescape_strings": false,
21    "wrap_line_length": 0,
22    "e4x": false,
23    "comma_first": false,
24    "operator_position": "before-newline",
25    "indent_empty_lines": false,
26    "templating": ["auto"]
27}

defaults not exposed in the cli

1{
2  "eval_code": false,
3  "space_before_conditional": true
4}

Notice not all defaults are exposed via the CLI. Historically, the Python and JS APIs have not been 100% identical. There are still a few other additional cases keeping us from 100% API-compatibility.

Loading settings from environment or .jsbeautifyrc (JavaScript-Only)

In addition to CLI arguments, you may pass config to the JS executable via:

any jsbeautify_-prefixed environment variables
a JSON-formatted file indicated by the --config parameter
a .jsbeautifyrc file containing JSON data at any level of the filesystem above $PWD

Configuration sources provided earlier in this stack will override later ones.

Setting inheritance and Language-specific overrides

The settings are a shallow tree whose values are inherited for all languages, but can be overridden. This works for settings passed directly to the API in either implementation. In the JavaScript implementation, settings loaded from a config file, such as .jsbeautifyrc, can also use inheritance/overriding.

Below is an example configuration tree showing all the supported locations for language override nodes. We'll use indent_size to discuss how this configuration would behave, but any number of settings can be inherited or overridden:

1{
2    "indent_size": 4,
3    "html": {
4        "end_with_newline": true,
5        "js": {
6            "indent_size": 2
7        },
8        "css": {
9            "indent_size": 2
10        }
11    },
12    "css": {
13        "indent_size": 1
14    },
15    "js": {
16       "preserve-newlines": true
17    }
18}

Using the above example would have the following result:

HTML files
- Inherit indent_size of 4 spaces from the top-level setting.
- The files would also end with a newline.
- JavaScript and CSS inside HTML
  - Inherit the HTML end_with_newline setting.
  - Override their indentation to 2 spaces.
CSS files
- Override the top-level setting to an indent_size of 1 space.
JavaScript files
- Inherit indent_size of 4 spaces from the top-level setting.
- Set preserve-newlines to true.

CSS & HTML

In addition to the js-beautify executable, css-beautify and html-beautify are also provided as an easy interface into those scripts. Alternatively, js-beautify --css or js-beautify --html will accomplish the same thing, respectively.

1// Programmatic access
2var beautify_js = require('js-beautify'); // also available under "js" export
3var beautify_css = require('js-beautify').css;
4var beautify_html = require('js-beautify').html;
5
6// All methods accept two arguments, the string to be beautified, and an options object.

The CSS & HTML beautifiers are much simpler in scope, and possess far fewer options.

1CSS Beautifier Options:
2  -s, --indent-size                  Indentation size [4]
3  -c, --indent-char                  Indentation character [" "]
4  -t, --indent-with-tabs             Indent with tabs, overrides -s and -c
5  -e, --eol                          Character(s) to use as line terminators. (default newline - "\\n")
6  -n, --end-with-newline             End output with newline
7  -b, --brace-style                  [collapse|expand] ["collapse"]
8  -L, --selector-separator-newline   Add a newline between multiple selectors
9  -N, --newline-between-rules        Add a newline between CSS rules
10  --indent-empty-lines               Keep indentation on empty lines
11
12HTML Beautifier Options:
13  -s, --indent-size                  Indentation size [4]
14  -c, --indent-char                  Indentation character [" "]
15  -t, --indent-with-tabs             Indent with tabs, overrides -s and -c
16  -e, --eol                          Character(s) to use as line terminators. (default newline - "\\n")
17  -n, --end-with-newline             End output with newline
18  -p, --preserve-newlines            Preserve existing line-breaks (--no-preserve-newlines disables)
19  -m, --max-preserve-newlines        Maximum number of line-breaks to be preserved in one chunk [10]
20  -I, --indent-inner-html            Indent <head> and <body> sections. Default is false.
21  -b, --brace-style                  [collapse-preserve-inline|collapse|expand|end-expand|none] ["collapse"]
22  -S, --indent-scripts               [keep|separate|normal] ["normal"]
23  -w, --wrap-line-length             Maximum characters per line (0 disables) [250]
24  -A, --wrap-attributes              Wrap attributes to new lines [auto|force|force-aligned|force-expand-multiline|aligned-multiple|preserve|preserve-aligned] ["auto"]
25  -M, --wrap-attributes-min-attrs    Minimum number of html tag attributes for force wrap attribute options [2]
26  -i, --wrap-attributes-indent-size  Indent wrapped attributes to after N characters [indent-size] (ignored if wrap-attributes is "aligned")
27  -d, --inline                       List of tags to be considered inline tags
28  --inline_custom_elements           Inline custom elements [true]
29  -U, --unformatted                  List of tags (defaults to inline) that should not be reformatted
30  -T, --content_unformatted          List of tags (defaults to pre) whose content should not be reformatted
31  -E, --extra_liners                 List of tags (defaults to [head,body,/html] that should have an extra newline before them.
32  --editorconfig                     Use EditorConfig to set up the options
33  --indent_scripts                   Sets indent level inside script tags ("normal", "keep", "separate")
34  --unformatted_content_delimiter    Keep text content together between this string [""]
35  --indent-empty-lines               Keep indentation on empty lines
36  --templating                       List of templating languages (auto,none,django,erb,handlebars,php,smarty,angular) ["auto"] auto = none in JavaScript, all in html

Directives

Directives let you control the behavior of the Beautifier from within your source files. Directives are placed in comments inside the file. Directives are in the format /* beautify {name}:{value} */ in CSS and JavaScript. In HTML they are formatted as .

Ignore directive

The ignore directive makes the beautifier completely ignore part of a file, treating it as literal text that is not parsed. The input below will remain unchanged after beautification:

1// Use ignore when the content is not parsable in the current language, JavaScript in this case.
2var a =  1;
3/* beautify ignore:start */
4 {This is some strange{template language{using open-braces?
5/* beautify ignore:end */

Preserve directive

NOTE: this directive only works in HTML and JavaScript, not CSS.

The preserve directive makes the Beautifier parse and then keep the existing formatting of a section of code.

The input below will remain unchanged after beautification:

1// Use preserve when the content is valid syntax in the current language, JavaScript in this case.
2// This will parse the code and preserve the existing formatting.
3/* beautify preserve:start */
4{
5    browserName: 'internet explorer',
6    platform:    'Windows 7',
7    version:     '8'
8}
9/* beautify preserve:end */

License

You are free to use this in any way you want, in case you find this useful or working for you but you must keep the copyright notice and license. (MIT)

Credits

Created by Einar Lielmanis, einar@beautifier.io
Python version flourished by Stefano Sanfilippo a.little.coder@gmail.com
Command-line for node.js by Daniel Stockman daniel.stockman@gmail.com
Maintained and expanded by Liam Newman bitwiseman@beautifier.io

Thanks also to Jason Diamond, Patrick Hof, Nochum Sossonko, Andreas Schneider, Dave Vasilevsky, Vital Batmanov, Ron Baldwin, Gabriel Harrison, Chris J. Shull, Mathias Bynens, Vittorio Gambaletta and others.

(README.md: js-beautify@1.15.1)

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