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# JS Beautifier [](http://travis-ci.org/beautify-web/js-beautify) [](https://www.npmjs.com/package/js-beautify) [](https://www.npmjs.com/package/js-beautify) [](https://gitter.im/beautify-web/js-beautify?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [](https://www.npmjs.org/package/js-beautify) 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](http://javascriptobfuscator.com/). # 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 [jsbeautifier.org](http://jsbeautifier.org/). Options are available via the UI. ## Python To beautify using python: ```bash $ pip install jsbeautifier $ js-beautify file.js ``` Beautified output goes to `stdout`. To use `jsbeautifier` as a library is simple: ``` python import jsbeautifier res = jsbeautifier.beautify('your javascript string') res = jsbeautifier.beautify_file('some_file.js') ``` ...or, to specify some options: ``` python 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. ```bash $ npm -g install js-beautify $ js-beautify foo.js ``` You can also use `js-beautify` as a `node` library (install locally, the `npm` default): ```bash $ npm install js-beautify ``` ```js 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: ```text 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 [" "] -e, --eol character(s) to use as line terminators. (default newline - "\\n")'); -l, --indent-level Initial indentation level [0] -t, --indent-with-tabs Indent with tabs, overrides -s and -c -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 ) -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] ["collapse"] -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 -n, --end-with-newline End output with newline -C, --comma-first Put commas at the beginning of new line instead of end --good-stuff Warm the cockles of Crockford's heart ``` These largely correspond to the underscored option keys for both library interfaces, which have these defaults: ```json { "indent_size": 4, "indent_char": " ", "eol": "\n", "indent_level": 0, "indent_with_tabs": false, "preserve_newlines": true, "max_preserve_newlines": 10, "jslint_happy": false, "space_after_anon_function": false, "brace_style": "collapse", "keep_array_indentation": false, "keep_function_indentation": false, "space_before_conditional": true, "break_chained_methods": false, "eval_code": false, "unescape_strings": false, "wrap_line_length": 0, "wrap_attributes": "auto", "wrap_attributes_indent_size": 4, "end_with_newline": false } ``` 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. You might notice that the CLI options and defaults hash aren't 100% correlated. 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 a few other additional cases keeping us from 100% API-compatibility. Patches welcome! ## 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 formtatting of or completely ignore part of a file. The example input below will remain changed after beautification ```js // 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 */ ``` ### 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. ```js // 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. ```text 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, --