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# jsesc [](https://travis-ci.org/mathiasbynens/jsesc) [](https://coveralls.io/r/mathiasbynens/jsesc) [](https://gemnasium.com/mathiasbynens/jsesc) This is a JavaScript library for [escaping JavaScript strings](http://mathiasbynens.be/notes/javascript-escapes) while generating the shortest possible valid ASCII-only output. [Here’s an online demo.](http://mothereff.in/js-escapes) This can be used to avoid [mojibake](http://en.wikipedia.org/wiki/Mojibake) and other encoding issues, or even to [avoid errors](https://twitter.com/annevk/status/380000829643571200) when passing JSON-formatted data (which may contain U+2028 LINE SEPARATOR, U+2029 PARAGRAPH SEPARATOR, or [lone surrogates](http://esdiscuss.org/topic/code-points-vs-unicode-scalar-values#content-14)) to a JavaScript parser or an UTF-8 encoder, respectively. Feel free to fork if you see possible improvements! ## Installation Via [Bower](http://bower.io/): ```bash bower install jsesc ``` Via [Component](https://github.com/component/component): ```bash component install mathiasbynens/jsesc ``` Via [npm](http://npmjs.org/): ```bash npm install jsesc ``` In a browser: ```html <script src="jsesc.js"></script> ``` In [Node.js](http://nodejs.org/) and [RingoJS](http://ringojs.org/): ```js var jsesc = require('jsesc'); ``` In [Narwhal](http://narwhaljs.org/): ```js var jsesc = require('jsesc').jsesc; ``` In [Rhino](http://www.mozilla.org/rhino/): ```js load('jsesc.js'); ``` Using an AMD loader like [RequireJS](http://requirejs.org/): ```js require( { 'paths': { 'jsesc': 'path/to/jsesc' } }, ['jsesc'], function(jsesc) { console.log(jsesc); } ); ``` ## API ### `jsesc(value, options)` This function takes a value and returns an escaped version of the value where any characters that are not printable ASCII symbols are escaped using the shortest possible (but valid) [escape sequences for use in JavaScript strings](http://mathiasbynens.be/notes/javascript-escapes). The first supported value type is strings: ```js jsesc('Ich ♥ Bücher'); // → 'Ich \\u2665 B\\xFCcher' jsesc('foo 𝌆 bar'); // → 'foo \\uD834\\uDF06 bar' ``` Instead of a string, the `value` can also be an array, or an object. In such cases, `jsesc` will return a stringified version of the value where any characters that are not printable ASCII symbols are escaped in the same way. ```js // Escaping an array jsesc([ 'Ich ♥ Bücher', 'foo 𝌆 bar' ]); // → '[\'Ich \\u2665 B\\xFCcher\',\'foo \\uD834\\uDF06 bar\']' // Escaping an object jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }); // → '{\'Ich \\u2665 B\\xFCcher\':\'foo \\uD834\\uDF06 bar\'}' ``` The optional `options` argument accepts an object with the following options: #### `quotes` The default value for the `quotes` option is `'single'`. This means that any occurences of `'` in the input string will be escaped as `\'`, so that the output can be used in a string literal wrapped in single quotes. ```js jsesc('Lorem ipsum "dolor" sit \'amet\' etc.'); // → 'Lorem ipsum "dolor" sit \\\'amet\\\' etc.' jsesc('Lorem ipsum "dolor" sit \'amet\' etc.', { 'quotes': 'single' }); // → 'Lorem ipsum "dolor" sit \\\'amet\\\' etc.' // → "Lorem ipsum \"dolor\" sit \\'amet\\' etc." ``` If you want to use the output as part of a string literal wrapped in double quotes, set the `quotes` option to `'double'`. ```js jsesc('Lorem ipsum "dolor" sit \'amet\' etc.', { 'quotes': 'double' }); // → 'Lorem ipsum \\"dolor\\" sit \'amet\' etc.' // → "Lorem ipsum \\\"dolor\\\" sit 'amet' etc." ``` This setting also affects the output for arrays and objects: ```js jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, { 'quotes': 'double' }); // → '{"Ich \\u2665 B\\xFCcher":"foo \\uD834\\uDF06 bar"}' jsesc([ 'Ich ♥ Bücher', 'foo 𝌆 bar' ], { 'quotes': 'double' }); // → '["Ich \\u2665 B\\xFCcher","foo \\uD834\\uDF06 bar"]' ``` #### `wrap` The `wrap` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, the output will be a valid JavaScript string literal wrapped in quotes. The type of quotes can be specified through the `quotes` setting. ```js jsesc('Lorem ipsum "dolor" sit \'amet\' etc.', { 'quotes': 'single', 'wrap': true }); // → '\'Lorem ipsum "dolor" sit \\\'amet\\\' etc.\'' // → "\'Lorem ipsum \"dolor\" sit \\\'amet\\\' etc.\'" jsesc('Lorem ipsum "dolor" sit \'amet\' etc.', { 'quotes': 'double', 'wrap': true }); // → '"Lorem ipsum \\"dolor\\" sit \'amet\' etc."' // → "\"Lorem ipsum \\\"dolor\\\" sit \'amet\' etc.\"" ``` #### `es6` The `es6` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, any astral Unicode symbols in the input will be escaped using [ECMAScript 6 Unicode code point escape sequences](http://mathiasbynens.be/notes/javascript-escapes#unicode-code-point) instead of using separate escape sequences for each surrogate half. If backwards compatibility with ES5 environments is a concern, don’t enable this setting. If the `json` setting is enabled, the value for the `es6` setting is ignored (as if it was `false`). ```js // By default, the `es6` option is disabled: jsesc('foo 𝌆 bar 💩 baz'); // → 'foo \\uD834\\uDF06 bar \\uD83D\\uDCA9 baz' // To explicitly disable it: jsesc('foo 𝌆 bar 💩 baz', { 'es6': false }); // → 'foo \\uD834\\uDF06 bar \\uD83D\\uDCA9 baz' // To enable it: jsesc('foo 𝌆 bar 💩 baz', { 'es6': true }); // → 'foo \\u{1D306} bar \\u{1F4A9} baz' ``` #### `escapeEverything` The `escapeEverything` option takes a boolean value (`true` or `false`), and defaults to `false` (disabled). When enabled, all the symbols in the output will be escaped, even printable ASCII symbols. ```js jsesc('lolwat"foo\'bar', { 'escapeEverything': true }); // → '\\x6C\\x6F\\x6C\\x77\\x61\\x74\\"\\x66\\x6F\\x6F\\\'\\x62\\x61\\x72' // → "\\x6C\\x6F\\x6C\\x77\\x61\\x74\\\"\\x66\\x6F\\x6F\\'\\x62\\x61\\x72" ``` This setting also affects the output for arrays and objects: ```js jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, { 'escapeEverything': true }); // → '{\'\x49\x63\x68\x20\u2665\x20\x42\xFC\x63\x68\x65\x72\':\'\x66\x6F\x6F\x20\uD834\uDF06\x20\x62\x61\x72\'}' // → "{'\x49\x63\x68\x20\u2665\x20\x42\xFC\x63\x68\x65\x72':'\x66\x6F\x6F\x20\uD834\uDF06\x20\x62\x61\x72'}" jsesc([ 'Ich ♥ Bücher': 'foo 𝌆 bar' ], { 'escapeEverything': true }); // → '[\'\x49\x63\x68\x20\u2665\x20\x42\xFC\x63\x68\x65\x72\',\'\x66\x6F\x6F\x20\uD834\uDF06\x20\x62\x61\x72\']' ``` #### `compact` The `compact` option takes a boolean value (`true` or `false`), and defaults to `true` (enabled). When enabled, the output for arrays and objects will be as compact as possible; it won’t be formatted nicely. ```js jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, { 'compact': true // this is the default }); // → '{\'Ich \u2665 B\xFCcher\':\'foo \uD834\uDF06 bar\'}' jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, { 'compact': false }); // → '{\n\t\'Ich \u2665 B\xFCcher\': \'foo \uD834\uDF06 bar\'\n}' jsesc([ 'Ich ♥ Bücher', 'foo 𝌆 bar' ], { 'compact': false }); // → '[\n\t\'Ich \u2665 B\xFCcher\',\n\t\'foo \uD834\uDF06 bar\'\n]' ``` This setting has no effect on the output for strings. #### `indent` The `indent` option takes a string value, and defaults to `'\t'`. When the `compact` setting is enabled (`true`), the value of the `indent` option is used to format the output for arrays and objects. ```js jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, { 'compact': false, 'indent': '\t' // this is the default }); // → '{\n\t\'Ich \u2665 B\xFCcher\': \'foo \uD834\uDF06 bar\'\n}' jsesc({ 'Ich ♥ Bücher': 'foo 𝌆 bar' }, { 'compact': false, 'indent':