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# cookie
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[![NPM Version][npm-version-image]][npm-url]
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[![NPM Downloads][npm-downloads-image]][npm-url]
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[![Node.js Version][node-version-image]][node-version-url]
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[![Build Status][github-actions-ci-image]][github-actions-ci-url]
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[![Test Coverage][coveralls-image]][coveralls-url]
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Basic HTTP cookie parser and serializer for HTTP servers.
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## Installation
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This is a [Node.js](https://nodejs.org/en/) module available through the
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[npm registry](https://www.npmjs.com/). Installation is done using the
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[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
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```sh
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$ npm install cookie
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```
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## API
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```js
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var cookie = require('cookie');
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```
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### cookie.parse(str, options)
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Parse an HTTP `Cookie` header string and returning an object of all cookie name-value pairs.
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The `str` argument is the string representing a `Cookie` header value and `options` is an
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optional object containing additional parsing options.
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```js
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var cookies = cookie.parse('foo=bar; equation=E%3Dmc%5E2');
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// { foo: 'bar', equation: 'E=mc^2' }
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```
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#### Options
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`cookie.parse` accepts these properties in the options object.
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##### decode
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Specifies a function that will be used to decode a cookie's value. Since the value of a cookie
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has a limited character set (and must be a simple string), this function can be used to decode
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a previously-encoded cookie value into a JavaScript string or other object.
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The default function is the global `decodeURIComponent`, which will decode any URL-encoded
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sequences into their byte representations.
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**note** if an error is thrown from this function, the original, non-decoded cookie value will
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be returned as the cookie's value.
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### cookie.serialize(name, value, options)
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Serialize a cookie name-value pair into a `Set-Cookie` header string. The `name` argument is the
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name for the cookie, the `value` argument is the value to set the cookie to, and the `options`
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argument is an optional object containing additional serialization options.
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```js
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var setCookie = cookie.serialize('foo', 'bar');
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// foo=bar
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```
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#### Options
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`cookie.serialize` accepts these properties in the options object.
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##### domain
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Specifies the value for the [`Domain` `Set-Cookie` attribute][rfc-6265-5.2.3]. By default, no
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domain is set, and most clients will consider the cookie to apply to only the current domain.
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##### encode
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Specifies a function that will be used to encode a cookie's value. Since value of a cookie
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has a limited character set (and must be a simple string), this function can be used to encode
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a value into a string suited for a cookie's value.
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The default function is the global `encodeURIComponent`, which will encode a JavaScript string
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into UTF-8 byte sequences and then URL-encode any that fall outside of the cookie range.
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##### expires
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Specifies the `Date` object to be the value for the [`Expires` `Set-Cookie` attribute][rfc-6265-5.2.1].
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By default, no expiration is set, and most clients will consider this a "non-persistent cookie" and
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will delete it on a condition like exiting a web browser application.
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**note** the [cookie storage model specification][rfc-6265-5.3] states that if both `expires` and
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`maxAge` are set, then `maxAge` takes precedence, but it is possible not all clients by obey this,
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so if both are set, they should point to the same date and time.
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##### httpOnly
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Specifies the `boolean` value for the [`HttpOnly` `Set-Cookie` attribute][rfc-6265-5.2.6]. When truthy,
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the `HttpOnly` attribute is set, otherwise it is not. By default, the `HttpOnly` attribute is not set.
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**note** be careful when setting this to `true`, as compliant clients will not allow client-side
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JavaScript to see the cookie in `document.cookie`.
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##### maxAge
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Specifies the `number` (in seconds) to be the value for the [`Max-Age` `Set-Cookie` attribute][rfc-6265-5.2.2].
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The given number will be converted to an integer by rounding down. By default, no maximum age is set.
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**note** the [cookie storage model specification][rfc-6265-5.3] states that if both `expires` and
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`maxAge` are set, then `maxAge` takes precedence, but it is possible not all clients by obey this,
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so if both are set, they should point to the same date and time.
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##### path
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Specifies the value for the [`Path` `Set-Cookie` attribute][rfc-6265-5.2.4]. By default, the path
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is considered the ["default path"][rfc-6265-5.1.4].
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##### sameSite
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Specifies the `boolean` or `string` to be the value for the [`SameSite` `Set-Cookie` attribute][rfc-6265bis-03-4.1.2.7].
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- `true` will set the `SameSite` attribute to `Strict` for strict same site enforcement.
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- `false` will not set the `SameSite` attribute.
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- `'lax'` will set the `SameSite` attribute to `Lax` for lax same site enforcement.
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- `'none'` will set the `SameSite` attribute to `None` for an explicit cross-site cookie.
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- `'strict'` will set the `SameSite` attribute to `Strict` for strict same site enforcement.
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More information about the different enforcement levels can be found in
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[the specification][rfc-6265bis-03-4.1.2.7].
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**note** This is an attribute that has not yet been fully standardized, and may change in the future.
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This also means many clients may ignore this attribute until they understand it.
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##### secure
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Specifies the `boolean` value for the [`Secure` `Set-Cookie` attribute][rfc-6265-5.2.5]. When truthy,
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the `Secure` attribute is set, otherwise it is not. By default, the `Secure` attribute is not set.
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**note** be careful when setting this to `true`, as compliant clients will not send the cookie back to
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the server in the future if the browser does not have an HTTPS connection.
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## Example
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The following example uses this module in conjunction with the Node.js core HTTP server
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to prompt a user for their name and display it back on future visits.
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```js
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var cookie = require('cookie');
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var escapeHtml = require('escape-html');
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var http = require('http');
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var url = require('url');
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function onRequest(req, res) {
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// Parse the query string
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var query = url.parse(req.url, true, true).query;
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if (query && query.name) {
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// Set a new cookie with the name
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res.setHeader('Set-Cookie', cookie.serialize('name', String(query.name), {
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httpOnly: true,
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maxAge: 60 * 60 * 24 * 7 // 1 week
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}));
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// Redirect back after setting cookie
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res.statusCode = 302;
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res.setHeader('Location', req.headers.referer || '/');
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res.end();
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return;
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}
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// Parse the cookies on the request
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var cookies = cookie.parse(req.headers.cookie || '');
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// Get the visitor name set in the cookie
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var name = cookies.name;
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res.setHeader('Content-Type', 'text/html; charset=UTF-8');
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if (name) {
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res.write('<p>Welcome back, <b>' + escapeHtml(name) + '</b>!</p>');
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} else {
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res.write('<p>Hello, new visitor!</p>');
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}
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res.write('<form method="GET">');
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res.write('<input placeholder="enter your name" name="name"> <input type="submit" value="Set Name">');
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res.end('</form>');
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}
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http.createServer(onRequest).listen(3000);
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```
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## Testing
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```sh
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$ npm test
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```
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## Benchmark
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```
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$ npm run bench
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> cookie@0.4.1 bench
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> node benchmark/index.js
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node@16.13.1
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v8@9.4.146.24-node.14
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uv@1.42.0
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zlib@1.2.11
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brotli@1.0.9
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ares@1.18.1
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modules@93
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nghttp2@1.45.1
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napi@8
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llhttp@6.0.4
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openssl@1.1.1l+quic
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cldr@39.0
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icu@69.1
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tz@2021a
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unicode@13.0
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ngtcp2@0.1.0-DEV
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nghttp3@0.1.0-DEV
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> node benchmark/parse-top.js
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cookie.parse - top sites
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15 tests completed.
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parse accounts.google.com x 504,358 ops/sec ±6.55% (171 runs sampled)
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parse apple.com x 1,369,991 ops/sec ±0.84% (189 runs sampled)
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parse cloudflare.com x 360,669 ops/sec ±3.75% (182 runs sampled)
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parse docs.google.com x 521,496 ops/sec ±4.90% (180 runs sampled)
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parse drive.google.com x 553,514 ops/sec ±0.59% (189 runs sampled)
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parse en.wikipedia.org x 286,052 ops/sec ±0.62% (188 runs sampled)
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parse linkedin.com x 178,817 ops/sec ±0.61% (192 runs sampled)
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parse maps.google.com x 284,585 ops/sec ±0.68% (188 runs sampled)
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parse microsoft.com x 161,230 ops/sec ±0.56% (192 runs sampled)
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parse play.google.com x 352,144 ops/sec ±1.01% (181 runs sampled)
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parse plus.google.com x 275,204 ops/sec ±7.78% (156 runs sampled)
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parse support.google.com x 339,493 ops/sec ±1.02% (191 runs sampled)
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parse www.google.com x 286,110 ops/sec ±0.90% (191 runs sampled)
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parse youtu.be x 548,557 ops/sec ±0.60% (184 runs sampled)
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parse youtube.com x 545,293 ops/sec ±0.65% (191 runs sampled)
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> node benchmark/parse.js
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cookie.parse - generic
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6 tests completed.
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simple x 1,266,646 ops/sec ±0.65% (191 runs sampled)
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decode x 838,413 ops/sec ±0.60% (191 runs sampled)
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unquote x 877,820 ops/sec ±0.72% (189 runs sampled)
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duplicates x 516,680 ops/sec ±0.61% (191 runs sampled)
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10 cookies x 156,874 ops/sec ±0.52% (189 runs sampled)
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100 cookies x 14,663 ops/sec ±0.53% (191 runs sampled)
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```
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## References
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- [RFC 6265: HTTP State Management Mechanism][rfc-6265]
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- [Same-site Cookies][rfc-6265bis-03-4.1.2.7]
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[rfc-6265bis-03-4.1.2.7]: https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-03#section-4.1.2.7
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[rfc-6265]: https://tools.ietf.org/html/rfc6265
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[rfc-6265-5.1.4]: https://tools.ietf.org/html/rfc6265#section-5.1.4
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[rfc-6265-5.2.1]: https://tools.ietf.org/html/rfc6265#section-5.2.1
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[rfc-6265-5.2.2]: https://tools.ietf.org/html/rfc6265#section-5.2.2
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[rfc-6265-5.2.3]: https://tools.ietf.org/html/rfc6265#section-5.2.3
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[rfc-6265-5.2.4]: https://tools.ietf.org/html/rfc6265#section-5.2.4
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[rfc-6265-5.2.5]: https://tools.ietf.org/html/rfc6265#section-5.2.5
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[rfc-6265-5.2.6]: https://tools.ietf.org/html/rfc6265#section-5.2.6
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[rfc-6265-5.3]: https://tools.ietf.org/html/rfc6265#section-5.3
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## License
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[MIT](LICENSE)
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[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/cookie/master
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[coveralls-url]: https://coveralls.io/r/jshttp/cookie?branch=master
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[github-actions-ci-image]: https://img.shields.io/github/workflow/status/jshttp/cookie/ci/master?label=ci
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[github-actions-ci-url]: https://github.com/jshttp/cookie/actions/workflows/ci.yml
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[node-version-image]: https://badgen.net/npm/node/cookie
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[node-version-url]: https://nodejs.org/en/download
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[npm-downloads-image]: https://badgen.net/npm/dm/cookie
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[npm-url]: https://npmjs.org/package/cookie
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[npm-version-image]: https://badgen.net/npm/v/cookie
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