# cookie [![NPM Version][npm-version-image]][npm-url] [![NPM Downloads][npm-downloads-image]][npm-url] [![Build Status][ci-image]][ci-url] [![Coverage Status][coverage-image]][coverage-url] Basic HTTP cookie parser and serializer for HTTP servers. ## Installation ```sh $ npm install cookie ``` ## API ```js const cookie = require("cookie"); // import * as cookie from 'cookie'; ``` ### cookie.parse(str, options) Parse a 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 const 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-value](https://datatracker.ietf.org/doc/html/rfc6265#section-4.1.1). 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. The default function is the global `decodeURIComponent`, wrapped in a `try..catch`. If an error is thrown it will return the cookie's original value. If you provide your own encode/decode scheme you must ensure errors are appropriately handled. ### 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 const setCookie = cookie.serialize("foo", "bar"); // foo=bar ``` #### Options `cookie.serialize` accepts these properties in the options object. ##### encode Specifies a function that will be used to encode a [cookie-value](https://datatracker.ietf.org/doc/html/rfc6265#section-4.1.1). 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, and should mirror `decode` when parsing. The default function is the global `encodeURIComponent`. ##### maxAge Specifies the `number` (in seconds) to be the value for the [`Max-Age` `Set-Cookie` attribute](https://tools.ietf.org/html/rfc6265#section-5.2.2). The [cookie storage model specification](https://tools.ietf.org/html/rfc6265#section-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. ##### expires Specifies the `Date` object to be the value for the [`Expires` `Set-Cookie` attribute](https://tools.ietf.org/html/rfc6265#section-5.2.1). When no expiration is set clients consider this a "non-persistent cookie" and delete it the current session is over. The [cookie storage model specification](https://tools.ietf.org/html/rfc6265#section-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. ##### domain Specifies the value for the [`Domain` `Set-Cookie` attribute](https://tools.ietf.org/html/rfc6265#section-5.2.3). When no domain is set clients consider the cookie to apply to the current domain only. ##### path Specifies the value for the [`Path` `Set-Cookie` attribute](https://tools.ietf.org/html/rfc6265#section-5.2.4). When no path is set, the path is considered the ["default path"](https://tools.ietf.org/html/rfc6265#section-5.1.4). ##### httpOnly Enables the [`HttpOnly` `Set-Cookie` attribute](https://tools.ietf.org/html/rfc6265#section-5.2.6). When enabled, clients will not allow client-side JavaScript to see the cookie in `document.cookie`. ##### secure Enables the [`Secure` `Set-Cookie` attribute](https://tools.ietf.org/html/rfc6265#section-5.2.5). When enabled, clients will only send the cookie back if the browser has a HTTPS connection. ##### partitioned Enables the [`Partitioned` `Set-Cookie` attribute](https://tools.ietf.org/html/draft-cutler-httpbis-partitioned-cookies/). When enabled, clients will only send the cookie back when the current domain _and_ top-level domain matches. This is an attribute that has not yet been fully standardized, and may change in the future. This also means clients may ignore this attribute until they understand it. More information about can be found in [the proposal](https://github.com/privacycg/CHIPS). ##### priority Specifies the value for the [`Priority` `Set-Cookie` attribute](https://tools.ietf.org/html/draft-west-cookie-priority-00#section-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 priority levels can be found in [the specification](https://tools.ietf.org/html/draft-west-cookie-priority-00#section-4.1). ##### sameSite Specifies the value for the [`SameSite` `Set-Cookie` attribute](https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-09#section-5.4.7). - `true` will set the `SameSite` attribute to `Strict` for strict same site enforcement. - `'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 enforcement levels can be found in [the specification](https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-09#section-5.4.7). ## 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("

Welcome back, " + escapeHtml(name) + "!

"); } else { res.write("

Hello, new visitor!

"); } res.write('"); } http.createServer(onRequest).listen(3000); ``` ## Testing ```sh npm test ``` ## Benchmark ```sh npm run bench ``` ``` name hz min max mean p75 p99 p995 p999 rme samples · simple 8,566,313.09 0.0000 0.3694 0.0001 0.0001 0.0002 0.0002 0.0003 ±0.64% 4283157 fastest · decode 3,834,348.85 0.0001 0.2465 0.0003 0.0003 0.0003 0.0004 0.0006 ±0.38% 1917175 · unquote 8,315,355.96 0.0000 0.3824 0.0001 0.0001 0.0002 0.0002 0.0003 ±0.72% 4157880 · duplicates 1,944,765.97 0.0004 0.2959 0.0005 0.0005 0.0006 0.0006 0.0008 ±0.24% 972384 · 10 cookies 675,345.67 0.0012 0.4328 0.0015 0.0015 0.0019 0.0020 0.0058 ±0.75% 337673 · 100 cookies 61,040.71 0.0152 0.4092 0.0164 0.0160 0.0196 0.0228 0.2260 ±0.71% 30521 slowest ✓ parse top-sites (15) 22945ms name hz min max mean p75 p99 p995 p999 rme samples · parse accounts.google.com 7,164,349.17 0.0000 0.0929 0.0001 0.0002 0.0002 0.0002 0.0003 ±0.09% 3582184 · parse apple.com 7,817,686.84 0.0000 0.6048 0.0001 0.0001 0.0002 0.0002 0.0003 ±1.05% 3908844 · parse cloudflare.com 7,189,841.70 0.0000 0.0390 0.0001 0.0002 0.0002 0.0002 0.0003 ±0.06% 3594921 · parse docs.google.com 7,051,765.61 0.0000 0.0296 0.0001 0.0002 0.0002 0.0002 0.0003 ±0.06% 3525883 · parse drive.google.com 7,349,104.77 0.0000 0.0368 0.0001 0.0001 0.0002 0.0002 0.0003 ±0.05% 3674553 · parse en.wikipedia.org 1,929,909.49 0.0004 0.3598 0.0005 0.0005 0.0007 0.0007 0.0012 ±0.16% 964955 · parse linkedin.com 2,225,658.01 0.0003 0.0595 0.0004 0.0005 0.0005 0.0005 0.0006 ±0.06% 1112830 · parse maps.google.com 4,423,511.68 0.0001 0.0942 0.0002 0.0003 0.0003 0.0003 0.0005 ±0.08% 2211756 · parse microsoft.com 3,387,601.88 0.0002 0.0725 0.0003 0.0003 0.0004 0.0004 0.0005 ±0.09% 1693801 · parse play.google.com 7,375,980.86 0.0000 0.1994 0.0001 0.0001 0.0002 0.0002 0.0003 ±0.12% 3687991 · parse support.google.com 4,912,267.94 0.0001 2.8958 0.0002 0.0002 0.0003 0.0003 0.0005 ±1.28% 2456134 · parse www.google.com 3,443,035.87 0.0002 0.2783 0.0003 0.0003 0.0004 0.0004 0.0007 ±0.51% 1721518 · parse youtu.be 1,910,492.87 0.0004 0.3490 0.0005 0.0005 0.0007 0.0007 0.0011 ±0.46% 955247 · parse youtube.com 1,895,082.62 0.0004 0.7454 0.0005 0.0005 0.0006 0.0007 0.0013 ±0.64% 947542 slowest · parse example.com 21,582,835.27 0.0000 0.1095 0.0000 0.0000 0.0001 0.0001 0.0001 ±0.13% 10791418 ``` ## References - [RFC 6265: HTTP State Management Mechanism](https://tools.ietf.org/html/rfc6265) - [Same-site Cookies](https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-09#section-5.4.7) ## License [MIT](LICENSE) [ci-image]: https://img.shields.io/github/actions/workflow/status/jshttp/cookie/ci.yml [ci-url]: https://github.com/jshttp/cookie/actions/workflows/ci.yml?query=branch%3Amaster [coverage-image]: https://img.shields.io/codecov/c/github/jshttp/cookie/master [coverage-url]: https://app.codecov.io/gh/jshttp/cookie [npm-downloads-image]: https://img.shields.io/npm/dm/cookie [npm-url]: https://npmjs.org/package/cookie [npm-version-image]: https://img.shields.io/npm/v/cookie

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