AttributeError: request object has no attribute 'cookies'

AttributeError: request has no attribute ‘cookies’

$ flask --app app.py run
Traceback (most recent call last):
  File "app.py", line 10, in index
    request.cookies['session']
AttributeError: 'Request' object has no attribute 'cookies'

Why this happens

This usually means you’re accessing request outside a request context or you replaced the request name with a different object. In standard Flask, cookies is always present on request during a real request.

Fix

Access cookies inside views or within a testing request context. Make sure you import request from Flask and don’t reassign it.

Wrong code

from flask import Flask
app = Flask(__name__)

# At import time
cookie = request.cookies.get('session')

Fixed code

from flask import Flask, request
app = Flask(__name__)

@app.route('/')
def index():
    session_cookie = request.cookies.get('session')
    return f"session={bool(session_cookie)}"

Tip

When testing, use client.set_cookie() to simulate browser cookies.