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JS Beautifier

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This little beautifier will reformat and reindent bookmarklets, ugly JavaScript, unpack scripts packed by Dean Edward’s popular packer, as well as deobfuscate scripts processed by javascriptobfuscator.com.

Usage

You can beautify javascript using JS Beautifier in your web browser, or on the command-line using node.js or python.

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

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

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<script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.7.3/beautify.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.7.3/beautify-css.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.7.3/beautify-html.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.7.3/beautify.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.7.3/beautify-css.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/js-beautify/1.7.3/beautify-html.min.js"></script> <script src="https://cdn.rawgit.com/beautify-web/js-beautify/v1.7.3/js/lib/beautify.js"></script> <script src="https://cdn.rawgit.com/beautify-web/js-beautify/v1.7.3/js/lib/beautify-css.js"></script> <script src="https://cdn.rawgit.com/beautify-web/js-beautify/v1.7.3/js/lib/beautify-html.js"></script>

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

Web Browser

Open jsbeautifier.org. Options are available via the UI.

Python

To beautify using python:

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$ pip install jsbeautifier $ js-beautify file.js

Beautified output goes to stdout.

To use jsbeautifier as a library is simple:

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import jsbeautifier res = jsbeautifier.beautify('your javascript string') res = jsbeautifier.beautify_file('some_file.js')

...or, to specify some options:

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opts = jsbeautifier.default_options() opts.indent_size = 2 res = jsbeautifier.beautify('some javascript', opts)

JavaScript

As an alternative to the Python script, 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.

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

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

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$ npm install js-beautify
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var beautify = require('js-beautify').js_beautify, fs = require('fs'); fs.readFile('foo.js', 'utf8', function (err, data) { if (err) { throw err; } console.log(beautify(data, { indent_size: 2 })); });

Options

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

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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"] -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 () -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

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{ "indent_size": 4, "indent_char": " ", "indent_with_tabs": 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, "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

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{ "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. For example, space_before_conditional is currently JS-only, and not addressable from the CLI script. 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:

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{ "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:

  • 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.

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// 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.

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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] ["auto"] -i, --wrap-attributes-indent-size Indent wrapped attributes to after N characters [indent-size] (ignored if wrap-attributes is "force-aligned") -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

Directives to Ignore or Preserve sections (Javascript only)

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

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// 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 */

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

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@1.7.3)