Use the response’s cookie() method to set cookies.

Examples:

res.cookie('username', 'Flavio')

This method accepts a third parameter, which contains various options:

res.cookie('username', 'Flavio', { domain: '.flaviocopes.com', path: '/administrator', secure: true })

res.cookie('username', 'Flavio', { expires: new Date(Date.now() + 900000), httpOnly: true })

The most useful options you can set are:

Option	Description
domain	The cookie domain name
expires	Set the cookie expiration date. If missing, or 0, the cookie is a session cookie
httpOnly	Set the cookie to be accessible only by the web server. See HttpOnly
maxAge	Set the expiry time relative to the current time, expressed in milliseconds
path	The cookie path. Set to ’/’ to apply to the whole site
secure	Marks the cookie HTTPS only
signed	Set the cookie to be signed
sameSite	Value of SameSite

A cookie can be cleared with:

res.clearCookie('username')

Lessons in this unit:

0:	Introduction
1:	Introduction to Express
2:	Request parameters
3:	Send a response to the client
4:	Send a JSON response
5:	▶︎ Manage cookies
6:	Work with HTTP headers
7:	Handling redirects
8:	Routing
9:	Template engines
10:	Middleware
11:	Serving Static Assets with Express
12:	Send files to the client
13:	Sessions
14:	Validating and sanitizing input
15:	Handling form data
16:	Handling CORS
17:	HTTPS with a self-signed certificate
18:	HTTPS with Let's Encrypt
19:	Handling file uploads
20:	Build a REST API with MongoDB