Laura Faust
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README.md
cookie-parser
Parse Cookie
header and populate req.cookies
with an object keyed by the
cookie names. Optionally you may enable signed cookie support by passing a
secret
string, which assigns req.secret
so it may be used by other
middleware.
Installation
$ npm install cookie-parser
API
var cookieParser = require('cookie-parser')
cookieParser(secret, options)
Create a new cookie parser middleware function using the given secret
and
options
.
secret
a string or array used for signing cookies. This is optional and if not specified, will not parse signed cookies. If a string is provided, this is used as the secret. If an array is provided, an attempt will be made to unsign the cookie with each secret in order.options
an object that is passed tocookie.parse
as the second option. See cookie for more information.decode
a function to decode the value of the cookie
The middleware will parse the Cookie
header on the request and expose the
cookie data as the property req.cookies
and, if a secret
was provided, as
the property req.signedCookies
. These properties are name value pairs of the
cookie name to cookie value.
When secret
is provided, this module will unsign and validate any signed cookie
values and move those name value pairs from req.cookies
into req.signedCookies
.
A signed cookie is a cookie that has a value prefixed with s:
. Signed cookies
that fail signature validation will have the value false
instead of the tampered
value.
In addition, this module supports special "JSON cookies". These are cookie where
the value is prefixed with j:
. When these values are encountered, the value will
be exposed as the result of JSON.parse
. If parsing fails, the original value will
remain.
cookieParser.JSONCookie(str)
Parse a cookie value as a JSON cookie. This will return the parsed JSON value if it was a JSON cookie, otherwise, it will return the passed value.
cookieParser.JSONCookies(cookies)
Given an object, this will iterate over the keys and call JSONCookie
on each
value, replacing the original value with the parsed value. This returns the
same object that was passed in.
cookieParser.signedCookie(str, secret)
Parse a cookie value as a signed cookie. This will return the parsed unsigned
value if it was a signed cookie and the signature was valid. If the value was
not signed, the original value is returned. If the value was signed but the
signature could not be validated, false
is returned.
The secret
argument can be an array or string. If a string is provided, this
is used as the secret. If an array is provided, an attempt will be made to
unsign the cookie with each secret in order.
cookieParser.signedCookies(cookies, secret)
Given an object, this will iterate over the keys and check if any value is a signed cookie. If it is a signed cookie and the signature is valid, the key will be deleted from the object and added to the new object that is returned.
The secret
argument can be an array or string. If a string is provided, this
is used as the secret. If an array is provided, an attempt will be made to
unsign the cookie with each secret in order.
Example
var express = require('express')
var cookieParser = require('cookie-parser')
var app = express()
app.use(cookieParser())
app.get('/', function (req, res) {
// Cookies that have not been signed
console.log('Cookies: ', req.cookies)
// Cookies that have been signed
console.log('Signed Cookies: ', req.signedCookies)
})
app.listen(8080)
// curl command that sends an HTTP request with two cookies
// curl http://127.0.0.1:8080 --cookie "Cho=Kim;Greet=Hello"