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# cookie

[![NPM Version][npm-version-image]][npm-url]
[![NPM Downloads][npm-downloads-image]][npm-url]
[![Node.js Version][node-image]][node-url]
[![Build Status][ci-image]][ci-url]
[![Coverage Status][coveralls-image]][coveralls-url]

Basic HTTP cookie parser and serializer for HTTP servers.

## Installation

This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):

```sh
$ npm install cookie
```

## API

```js
var cookie = require('cookie');
```

### cookie.parse(str, options)

Parse an HTTP `Cookie` header string and returning an object of all cookie name-value pairs.
The `str` argument is the string representing a `Cookie` header value and `options` is an
optional object containing additional parsing options.

```js
var cookies = cookie.parse('foo=bar; equation=E%3Dmc%5E2');
// { foo: 'bar', equation: 'E=mc^2' }
```

#### Options

`cookie.parse` accepts these properties in the options object.

##### decode

Specifies a function that will be used to decode a cookie's value. Since the value of a cookie
has a limited character set (and must be a simple string), this function can be used to decode
a previously-encoded cookie value into a JavaScript string or other object.

The default function is the global `decodeURIComponent`, which will decode any URL-encoded
sequences into their byte representations.

**note** if an error is thrown from this function, the original, non-decoded cookie value will
be returned as the cookie's value.

### cookie.serialize(name, value, options)

Serialize a cookie name-value pair into a `Set-Cookie` header string. The `name` argument is the
name for the cookie, the `value` argument is the value to set the cookie to, and the `options`
argument is an optional object containing additional serialization options.

```js
var setCookie = cookie.serialize('foo', 'bar');
// foo=bar
```

#### Options

`cookie.serialize` accepts these properties in the options object.

##### domain

Specifies the value for the [`Domain` `Set-Cookie` attribute][rfc-6265-5.2.3]. By default, no
domain is set, and most clients will consider the cookie to apply to only the current domain.

##### encode

Specifies a function that will be used to encode a cookie's value. Since value of a cookie
has a limited character set (and must be a simple string), this function can be used to encode
a value into a string suited for a cookie's value.

The default function is the global `encodeURIComponent`, which will encode a JavaScript string
into UTF-8 byte sequences and then URL-encode any that fall outside of the cookie range.

##### expires

Specifies the `Date` object to be the value for the [`Expires` `Set-Cookie` attribute][rfc-6265-5.2.1].
By default, no expiration is set, and most clients will consider this a "non-persistent cookie" and
will delete it on a condition like exiting a web browser application.

**note** the [cookie storage model specification][rfc-6265-5.3] states that if both `expires` and
`maxAge` are set, then `maxAge` takes precedence, but it is possible not all clients by obey this,
so if both are set, they should point to the same date and time.

##### httpOnly

Specifies the `boolean` value for the [`HttpOnly` `Set-Cookie` attribute][rfc-6265-5.2.6]. When truthy,
the `HttpOnly` attribute is set, otherwise it is not. By default, the `HttpOnly` attribute is not set.

**note** be careful when setting this to `true`, as compliant clients will not allow client-side
JavaScript to see the cookie in `document.cookie`.

##### maxAge

Specifies the `number` (in seconds) to be the value for the [`Max-Age` `Set-Cookie` attribute][rfc-6265-5.2.2].
The given number will be converted to an integer by rounding down. By default, no maximum age is set.

**note** the [cookie storage model specification][rfc-6265-5.3] states that if both `expires` and
`maxAge` are set, then `maxAge` takes precedence, but it is possible not all clients by obey this,
so if both are set, they should point to the same date and time.

##### partitioned

Specifies the `boolean` value for the [`Partitioned` `Set-Cookie`](rfc-cutler-httpbis-partitioned-cookies)
attribute. When truthy, the `Partitioned` attribute is set, otherwise it is not. By default, the
`Partitioned` attribute is not set.

**note** This is an attribute that has not yet been fully standardized, and may change in the future.
This also means many clients may ignore this attribute until they understand it.

More information about can be found in [the proposal](https://github.com/privacycg/CHIPS).

##### path

Specifies the value for the [`Path` `Set-Cookie` attribute][rfc-6265-5.2.4]. By default, the path
is considered the ["default path"][rfc-6265-5.1.4].

##### priority

Specifies the `string` to be the value for the [`Priority` `Set-Cookie` attribute][rfc-west-cookie-priority-00-4.1].

  - `'low'` will set the `Priority` attribute to `Low`.
  - `'medium'` will set the `Priority` attribute to `Medium`, the default priority when not set.
  - `'high'` will set the `Priority` attribute to `High`.

More information about the different priority levels can be found in
[the specification][rfc-west-cookie-priority-00-4.1].

**note** This is an attribute that has not yet been fully standardized, and may change in the future.
This also means many clients may ignore this attribute until they understand it.

##### sameSite

Specifies the `boolean` or `string` to be the value for the [`SameSite` `Set-Cookie` attribute][rfc-6265bis-09-5.4.7].

  - `true` will set the `SameSite` attribute to `Strict` for strict same site enforcement.
  - `false` will not set the `SameSite` attribute.
  - `'lax'` will set the `SameSite` attribute to `Lax` for lax same site enforcement.
  - `'none'` will set the `SameSite` attribute to `None` for an explicit cross-site cookie.
  - `'strict'` will set the `SameSite` attribute to `Strict` for strict same site enforcement.

More information about the different enforcement levels can be found in
[the specification][rfc-6265bis-09-5.4.7].

**note** This is an attribute that has not yet been fully standardized, and may change in the future.
This also means many clients may ignore this attribute until they understand it.

##### secure

Specifies the `boolean` value for the [`Secure` `Set-Cookie` attribute][rfc-6265-5.2.5]. When truthy,
the `Secure` attribute is set, otherwise it is not. By default, the `Secure` attribute is not set.

**note** be careful when setting this to `true`, as compliant clients will not send the cookie back to
the server in the future if the browser does not have an HTTPS connection.

## Example

The following example uses this module in conjunction with the Node.js core HTTP server
to prompt a user for their name and display it back on future visits.

```js
var cookie = require('cookie');
var escapeHtml = require('escape-html');
var http = require('http');
var url = require('url');

function onRequest(req, res) {
  // Parse the query string
  var query = url.parse(req.url, true, true).query;

  if (query && query.name) {
    // Set a new cookie with the name
    res.setHeader('Set-Cookie', cookie.serialize('name', String(query.name), {
      httpOnly: true,
      maxAge: 60 * 60 * 24 * 7 // 1 week
    }));

    // Redirect back after setting cookie
    res.statusCode = 302;
    res.setHeader('Location', req.headers.referer || '/');
    res.end();
    return;
  }

  // Parse the cookies on the request
  var cookies = cookie.parse(req.headers.cookie || '');

  // Get the visitor name set in the cookie
  var name = cookies.name;

  res.setHeader('Content-Type', 'text/html; charset=UTF-8');

  if (name) {
    res.write('<p>Welcome back, <b>' + escapeHtml(name) + '</b>!</p>');
  } else {
    res.write('<p>Hello, new visitor!</p>');
  }

  res.write('<form method="GET">');
  res.write('<input placeholder="enter your name" name="name"> <input type="submit" value="Set Name">');
  res.end('</form>');
}

http.createServer(onRequest).listen(3000);
```

## Testing

```sh
$ npm test
```

## Benchmark

```
$ npm run bench

> cookie@0.5.0 bench
> node benchmark/index.js

  node@18.18.2
  acorn@8.10.0
  ada@2.6.0
  ares@1.19.1
  brotli@1.0.9
  cldr@43.1
  icu@73.2
  llhttp@6.0.11
  modules@108
  napi@9
  nghttp2@1.57.0
  nghttp3@0.7.0
  ngtcp2@0.8.1
  openssl@3.0.10+quic
  simdutf@3.2.14
  tz@2023c
  undici@5.26.3
  unicode@15.0
  uv@1.44.2
  uvwasi@0.0.18
  v8@10.2.154.26-node.26
  zlib@1.2.13.1-motley

> node benchmark/parse-top.js

  cookie.parse - top sites

  14 tests completed.

  parse accounts.google.com x 2,588,913 ops/sec ±0.74% (186 runs sampled)
  parse apple.com           x 2,370,002 ops/sec ±0.69% (186 runs sampled)
  parse cloudflare.com      x 2,213,102 ops/sec ±0.88% (188 runs sampled)
  parse docs.google.com     x 2,194,157 ops/sec ±1.03% (184 runs sampled)
  parse drive.google.com    x 2,265,084 ops/sec ±0.79% (187 runs sampled)
  parse en.wikipedia.org    x   457,099 ops/sec ±0.81% (186 runs sampled)
  parse linkedin.com        x   504,407 ops/sec ±0.89% (186 runs sampled)
  parse maps.google.com     x 1,230,959 ops/sec ±0.98% (186 runs sampled)
  parse microsoft.com       x   926,294 ops/sec ±0.88% (184 runs sampled)
  parse play.google.com     x 2,311,338 ops/sec ±0.83% (185 runs sampled)
  parse support.google.com  x 1,508,850 ops/sec ±0.86% (186 runs sampled)
  parse www.google.com      x 1,022,582 ops/sec ±1.32% (182 runs sampled)
  parse youtu.be            x   332,136 ops/sec ±1.02% (185 runs sampled)
  parse youtube.com         x   323,833 ops/sec ±0.77% (183 runs sampled)

> node benchmark/parse.js

  cookie.parse - generic

  6 tests completed.

  simple      x 3,214,032 ops/sec ±1.61% (183 runs sampled)
  decode      x   587,237 ops/sec ±1.16% (187 runs sampled)
  unquote     x 2,954,618 ops/sec ±1.35% (183 runs sampled)
  duplicates  x   857,008 ops/sec ±0.89% (187 runs sampled)
  10 cookies  x   292,133 ops/sec ±0.89% (187 runs sampled)
  100 cookies x    22,610 ops/sec ±0.68% (187 runs sampled)
```

## References

- [RFC 6265: HTTP State Management Mechanism][rfc-6265]
- [Same-site Cookies][rfc-6265bis-09-5.4.7]

[rfc-cutler-httpbis-partitioned-cookies]: https://tools.ietf.org/html/draft-cutler-httpbis-partitioned-cookies/
[rfc-west-cookie-priority-00-4.1]: https://tools.ietf.org/html/draft-west-cookie-priority-00#section-4.1
[rfc-6265bis-09-5.4.7]: https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-09#section-5.4.7
[rfc-6265]: https://tools.ietf.org/html/rfc6265
[rfc-6265-5.1.4]: https://tools.ietf.org/html/rfc6265#section-5.1.4
[rfc-6265-5.2.1]: https://tools.ietf.org/html/rfc6265#section-5.2.1
[rfc-6265-5.2.2]: https://tools.ietf.org/html/rfc6265#section-5.2.2
[rfc-6265-5.2.3]: https://tools.ietf.org/html/rfc6265#section-5.2.3
[rfc-6265-5.2.4]: https://tools.ietf.org/html/rfc6265#section-5.2.4
[rfc-6265-5.2.5]: https://tools.ietf.org/html/rfc6265#section-5.2.5
[rfc-6265-5.2.6]: https://tools.ietf.org/html/rfc6265#section-5.2.6
[rfc-6265-5.3]: https://tools.ietf.org/html/rfc6265#section-5.3

## License

[MIT](LICENSE)

[ci-image]: https://badgen.net/github/checks/jshttp/cookie/master?label=ci
[ci-url]: https://github.com/jshttp/cookie/actions/workflows/ci.yml
[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/cookie/master
[coveralls-url]: https://coveralls.io/r/jshttp/cookie?branch=master
[node-image]: https://badgen.net/npm/node/cookie
[node-url]: https://nodejs.org/en/download
[npm-downloads-image]: https://badgen.net/npm/dm/cookie
[npm-url]: https://npmjs.org/package/cookie
[npm-version-image]: https://badgen.net/npm/v/cookie
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