# Flask – Cookies
A cookie is stored on a client’s computer in the form of a text file. Its purpose is to remember and track data pertaining to a client’s usage for better visitor experience and site statistics.
A **Request object** contains a cookie’s attribute. It is a dictionary object of all the cookie variables and their corresponding values, a client has transmitted. In addition to it, a cookie also stores its expiry time, path and domain name of the site.
In Flask, cookies are set on response object. Use **make\_response()** function to get response object from return value of a view function. After that, use the **set\_cookie()** function of response object to store a cookie.
Reading back a cookie is easy. The **get()** method of **request.cookies** attribute is used to read a cookie.
In the following Flask application, a simple form opens up as you visit **‘/’** URL.
```
@app.route('/')
def index():
return render_template('index.html')
```
This HTML page contains one text input.
```
```
The Form is posted to **‘/setcookie’** URL. The associated view function sets a Cookie name **userID** and renders another page.
```
@app.route('/setcookie', methods = ['POST', 'GET'])
def setcookie():
if request.method == 'POST':
user = request.form['nm']
resp = make_response(render_template('readcookie.html'))
resp.set_cookie('userID', user)
return resp
```
**‘readcookie.html’** contains a hyperlink to another view function **getcookie()**, which reads back and displays the cookie value in browser.
```
@app.route('/getcookie')
def getcookie():
name = request.cookies.get('userID')
return 'welcome '+name+'
'
```
Run the application and visit **http://localhost:5000/**
The result of setting a cookie is displayed like this −
The output of read back cookie is shown below.
