js-beautify/README.md

# JS Beautifier

...or, more specifically, all of the code powering
[jsbeautifier.org](http://jsbeautifier.org/).

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

To beautify from the command-line you can use the provided Python script/library or [npm](http://npmjs.org/) package.

### Python

`./js-beautify file.js` beautifies a file, 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). These can also be passed directly.
  -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
  -v, --version                 Show the version
  -h, --help                    Show this help

Beautifier Options:
  -s, --indent-size             Indentation size [4]
  -c, --indent-char             Indentation character [" "]
  -l, --indent-level            Initial indentation level [0]
  -t, --indent-with-tabs        Indent with tabs, overrides -s and -c
  -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]
  -j, --jslint-happy            Enable jslint-stricter mode
  -b, --brace-style             [collapse|expand|end-expand|expand-strict] ["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]
  --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": " ",
    "indent_level": 0,
    "indent_with_tabs": false,
    "preserve_newlines": true,
    "max_preserve_newlines": 10,
    "jslint_happy": 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
}
```

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!

#### 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 [" "]

HTML Beautifier Options:
  -s, --indent-size             Indentation size [4]
  -c, --indent-char             Indentation character [" "]
  -b, --brace-style             [collapse|expand|end-expand] ["collapse"]
  -S, --indent-scripts          [keep|separate|normal] ["normal"]
  -W, --max-char                Maximum characters per line (0 disables) [250]
  -U, --unformatted             List of tags (defaults to inline) that should not be reformatted
```

## License

You are free to use this in any way you want, in case you find this
useful or working for you. (MIT)

## Credits

Written by Einar Lielmanis, <einar@jsbeautifier.org>
Python version flourished by Stefano Sanfilippo <a.little.coder@gmail.com>

Thanks 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.