$ npm install js-beautify
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.
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!
You can install the beautifier for node.js or python.
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.
$ npm -g install js-beautify
$ js-beautify foo.js
You can also use js-beautify
as a node
library (install locally, the npm
default):
$ npm install js-beautify
The above install the latest stable release. To install beta or RC versions:
$ npm install js-beautify@next
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:
<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.8.10-beta4/beautify.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.8.10-beta4/beautify-css.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.8.10-beta4/beautify-html.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.8.10-beta4/beautify.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.8.10-beta4/beautify-css.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.8.10-beta4/beautify-html.min.js"></script>
<script src="https://cdn.rawgit.com/beautify-web/js-beautify/v1.8.10-beta4/js/lib/beautify.js"></script>
<script src="https://cdn.rawgit.com/beautify-web/js-beautify/v1.8.10-beta4/js/lib/beautify-css.js"></script>
<script src="https://cdn.rawgit.com/beautify-web/js-beautify/v1.8.10-beta4/js/lib/beautify-html.js"></script>
Older versions are available by changing the version number.
Disclaimer: These are free services, so there are no uptime or support guarantees.
To install the Python version of the beautifier:
$ pip install jsbeautifier
You can beautify javascript using JS Beautifier in your web browser, or on the command-line using node.js or python.
Open beautifier.io. Options are available via the UI.
The script tags above expose three functions: js_beautify
, css_beautify
, and html_beautify
.
When installed globally, the beautifier provides an executable js-beautify
script. The beautified result is sent to stdout
unless otherwise configured.
$ 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 }
.
var beautify = require('js-beautify').js,
fs = require('fs');
fs.readFile('foo.js', 'utf8', function (err, data) {
if (err) {
throw err;
}
console.log(beautify(data, { indent_size: 2, space_in_empty_paren: true }));
});
After installing, to beautify using Python:
$ js-beautify file.js
Beautified output goes to stdout
by default.
To use jsbeautifier
as a library is simple:
import jsbeautifier
res = jsbeautifier.beautify('your javascript string')
res = jsbeautifier.beautify_file('some_file.js')
...or, to specify some options:
opts = jsbeautifier.default_options()
opts.indent_size = 2
opts.space_in_empty_paren = True
res = 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
.
These are the command-line flags for both Python and JS scripts:
CLI Options:
-f, --file Input file(s) (Pass '-' for stdin)
-r, --replace Write output in-place, replacing input
-o, --outfile Write output to file (default stdout)
--config Path to config file
--type [js|css|html] ["js"] Select beautifier type (NOTE: Does *not* filter files, only defines which beautifier type to run)
-q, --quiet Suppress logging to stdout
-h, --help Show this help
-v, --version Show the version
Beautifier Options:
-s, --indent-size Indentation size [4]
-c, --indent-char Indentation character [" "]
-t, --indent-with-tabs Indent with tabs, overrides -s and -c
-e, --eol Character(s) to use as line terminators.
[first newline in file, otherwise "\n]
-n, --end-with-newline End output with newline
--editorconfig Use EditorConfig to set up the options
-l, --indent-level Initial indentation level [0]
-p, --preserve-newlines Preserve line-breaks (--no-preserve-newlines disables)
-m, --max-preserve-newlines Number of line-breaks to be preserved in one chunk [10]
-P, --space-in-paren Add padding spaces within paren, ie. f( a, b )
-E, --space-in-empty-paren Add a single space inside empty paren, ie. f( )
-j, --jslint-happy Enable jslint-stricter mode
-a, --space-after-anon-function Add a space before an anonymous function's parens, ie. function ()
--space-after-named-function Add a space before a named function's parens, i.e. function example ()
-b, --brace-style [collapse|expand|end-expand|none][,preserve-inline] [collapse,preserve-inline]
-u, --unindent-chained-methods Don't indent chained method calls
-B, --break-chained-methods Break chained method calls across subsequent lines
-k, --keep-array-indentation Preserve array indentation
-x, --unescape-strings Decode printable characters encoded in xNN notation
-w, --wrap-line-length Wrap lines at next opportunity after N characters [0]
-X, --e4x Pass E4X xml literals through untouched
--good-stuff Warm the cockles of Crockford's heart
-C, --comma-first Put commas at the beginning of new line instead of end
-O, --operator-position Set operator position (before-newline|after-newline|preserve-newline) [before-newline]
Which correspond to the underscored option keys for both library interfaces
defaults per CLI options
{
"indent_size": 4,
"indent_char": " ",
"indent_with_tabs": false,
"editorconfig": false,
"eol": "\n",
"end_with_newline": false,
"indent_level": 0,
"preserve_newlines": true,
"max_preserve_newlines": 10,
"space_in_paren": false,
"space_in_empty_paren": false,
"jslint_happy": false,
"space_after_anon_function": false,
"space_after_named_function": false,
"brace_style": "collapse",
"unindent_chained_methods": false,
"break_chained_methods": false,
"keep_array_indentation": false,
"unescape_strings": false,
"wrap_line_length": 0,
"e4x": false,
"comma_first": false,
"operator_position": "before-newline"
}
defaults not exposed in the cli
{
"eval_code": false,
"space_before_conditional": true
}
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.
In addition to CLI arguments, you may pass config to the JS executable via:
jsbeautify_
-prefixed environment variablesJSON
-formatted file indicated by the --config
parameter.jsbeautifyrc
file containing JSON
data at any level of the filesystem above $PWD
Configuration sources provided earlier in this stack will override later ones.
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:
{
"indent_size": 4,
"html": {
"end_with_newline": true,
"js": {
"indent_size": 2
},
"css": {
"indent_size": 2
}
},
"css": {
"indent_size": 1
},
"js": {
"preserve-newlines": true
}
}
Using the above example would have the following result:
indent_size
of 4 spaces from the top-level setting.end_with_newline
setting.indent_size
of 1 space.indent_size
of 4 spaces from the top-level setting.preserve-newlines
to true
.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.
// Programmatic access
var beautify_js = require('js-beautify'); // also available under "js" export
var beautify_css = require('js-beautify').css;
var beautify_html = require('js-beautify').html;
// 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.
CSS Beautifier Options:
-s, --indent-size Indentation size [4]
-c, --indent-char Indentation character [" "]
-t, --indent-with-tabs Indent with tabs, overrides -s and -c
-e, --eol Character(s) to use as line terminators. (default newline - "\\n")
-n, --end-with-newline End output with newline
-L, --selector-separator-newline Add a newline between multiple selectors
-N, --newline-between-rules Add a newline between CSS rules
HTML Beautifier Options:
-s, --indent-size Indentation size [4]
-c, --indent-char Indentation character [" "]
-t, --indent-with-tabs Indent with tabs, overrides -s and -c
-e, --eol Character(s) to use as line terminators. (default newline - "\\n")
-n, --end-with-newline End output with newline
-p, --preserve-newlines Preserve existing line-breaks (--no-preserve-newlines disables)
-m, --max-preserve-newlines Maximum number of line-breaks to be preserved in one chunk [10]
-I, --indent-inner-html Indent <head> and <body> sections. Default is false.
-b, --brace-style [collapse-preserve-inline|collapse|expand|end-expand|none] ["collapse"]
-S, --indent-scripts [keep|separate|normal] ["normal"]
-w, --wrap-line-length Maximum characters per line (0 disables) [250]
-A, --wrap-attributes Wrap attributes to new lines [auto|force|force-aligned|force-expand-multiline|aligned-multiple|preserve|preserve-aligned] ["auto"]
-i, --wrap-attributes-indent-size Indent wrapped attributes to after N characters [indent-size] (ignored if wrap-attributes is "aligned")
-d, --inline List of tags to be considered inline tags
-U, --unformatted List of tags (defaults to inline) that should not be reformatted
-T, --content_unformatted List of tags (defaults to pre) whose content should not be reformatted
-E, --extra_liners List of tags (defaults to [head,body,/html] that should have an extra newline before them.
--editorconfig Use EditorConfig to set up the options
--indent_scripts Sets indent level inside script tags ("normal", "keep", "separate")
Beautifier for supports directives in comments inside the file. This allows you to tell the beautifier to preserve the formatting of or completely ignore part of a file. The example input below will remain changed after beautification
// Use preserve when the content is not javascript, but you don't want it reformatted.
/* beautify preserve:start */
{
browserName: 'internet explorer',
platform: 'Windows 7',
version: '8'
}
/* beautify preserve:end */
// Use ignore when the content is not parsable as javascript.
var a = 1;
/* beautify ignore:start */
{This is some strange{template language{using open-braces?
/* beautify ignore:end */
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)
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@1.8.10-beta4)
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