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# stringify-entities
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[![Build Status][build-badge]][build-status]
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[![Coverage Status][coverage-badge]][coverage-status]
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[![Downloads][downloads-badge]][downloads]
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[![Size][size-badge]][size]
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Encode HTML character references and character entities.
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* [x] Very fast
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* [x] Just the encoding part
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* [x] Reliable: ``'`'`` characters are escaped to ensure no scripts
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run in Internet Explorer 6 to 8.
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Additionally, only named entities recognized by HTML4 are encoded, meaning
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the infamous `'` (which people think is a [virus][]) won’t show up
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## Algorithm
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By default, all dangerous, non-ASCII, and non-printable ASCII characters are
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encoded.
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A [subset][] of characters can be given to encode just those characters.
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Alternatively, pass [`escapeOnly`][escapeonly] to escape just the dangerous
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characters (`"`, `'`, `<`, `>`, `&`, `` ` ``).
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By default, numeric entities are used.
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Pass [`useNamedReferences`][named] to use named entities when possible, or
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[`useShortestReferences`][short] to use them if that results in less bytes.
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## Install
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[npm][]:
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```sh
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npm install stringify-entities
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```
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## Use
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```js
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var stringify = require('stringify-entities')
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stringify('alpha © bravo ≠ charlie 𝌆 delta')
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// => 'alpha © bravo ≠ charlie 𝌆 delta'
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stringify('alpha © bravo ≠ charlie 𝌆 delta', {useNamedReferences: true})
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// => 'alpha © bravo ≠ charlie 𝌆 delta'
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```
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## API
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### `stringifyEntities(value[, options])`
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Encode special characters in `value`.
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##### `options`
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###### `options.escapeOnly`
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Whether to only escape possibly dangerous characters (`boolean`,
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default: `false`).
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Those characters are `"`, `'`, `<`, `>` `&`, and `` ` ``.
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###### `options.subset`
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Whether to only escape the given subset of characters (`Array.<string>`).
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###### `options.useNamedReferences`
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Whether to use named entities where possible (`boolean?`, default: `false`).
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###### `options.useShortestReferences`
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Whether to use named entities, where possible, if that results in less bytes
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(`boolean?`, default: `false`).
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**Note**: `useNamedReferences` can be omitted when using `useShortestReferences`.
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###### `options.omitOptionalSemicolons`
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Whether to omit semicolons when possible (`boolean?`, default: `false`).
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**Note**: This creates parse errors, don’t use this except when building a
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minifier.
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Omitting semicolons is possible for [certain][dangerous] [legacy][] named
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references, and numeric entities, in some cases.
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###### `options.attribute`
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Only needed when operating dangerously with `omitOptionalSemicolons: true`.
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Create entities which don’t fail in attributes (`boolean?`, default: `false`).
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## Related
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* [`parse-entities`](https://github.com/wooorm/parse-entities)
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— Parse HTML character references
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* [`character-entities`](https://github.com/wooorm/character-entities)
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— Info on character entities
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* [`character-entities-html4`](https://github.com/wooorm/character-entities-html4)
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— Info on HTML4 character entities
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* [`character-entities-legacy`](https://github.com/wooorm/character-entities-legacy)
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— Info on legacy character entities
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* [`character-reference-invalid`](https://github.com/wooorm/character-reference-invalid)
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— Info on invalid numeric character references
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## License
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[MIT][license] © [Titus Wormer][author]
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<!-- Definitions -->
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[build-badge]: https://img.shields.io/travis/wooorm/stringify-entities.svg
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[build-status]: https://travis-ci.org/wooorm/stringify-entities
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[coverage-badge]: https://img.shields.io/codecov/c/github/wooorm/stringify-entities.svg
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[coverage-status]: https://codecov.io/github/wooorm/stringify-entities
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[downloads-badge]: https://img.shields.io/npm/dm/stringify-entities.svg
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[downloads]: https://www.npmjs.com/package/stringify-entities
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[size-badge]: https://img.shields.io/bundlephobia/minzip/stringify-entities.svg
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[size]: https://bundlephobia.com/result?p=stringify-entities
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[license]: license
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[author]: https://wooorm.com
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[npm]: https://docs.npmjs.com/cli/install
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[virus]: https://www.telegraph.co.uk/technology/advice/10516839/Why-do-some-apostrophes-get-replaced-with-andapos.html
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[dangerous]: dangerous.json
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[legacy]: https://github.com/wooorm/character-entities-legacy
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[subset]: #optionssubset
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[escapeonly]: #optionsescapeonly
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[named]: #optionsusenamedreferences
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[short]: #optionsuseshortestreferences
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