Logout implementation in Flask - Mini Project: Build & Apply

Logout implementation

📖 Scenario: You are building a simple web application using Flask. Users can log in and log out. You want to add a logout feature that ends the user session and redirects them to the homepage.

🎯 Goal: Create a Flask route called /logout that clears the user session and redirects to the / homepage.

📋 What You'll Learn

Create a Flask app with session support

Add a route /logout that clears the session

Redirect the user to the homepage after logout

Use Flask's session and redirect functions

💡 Why This Matters

🌍 Real World

Logging out users securely is essential for web apps to protect user data and privacy.

💼 Career

Understanding session management and logout flows is a key skill for backend web developers.

1

Set up Flask app and session

Import Flask, session, and redirect from flask. Create a Flask app called app and set app.secret_key to 'secret123'.

Flask

# Your code here

Need a hint?

Use Flask(__name__) to create the app and set a secret key for sessions.

2

Create a logout route

Define a route /logout using @app.route('/logout'). Create a function called logout that will handle logout logic.

Flask

from flask import Flask, session, redirect

app = Flask(__name__)
app.secret_key = 'secret123'

# Define the /logout route and function
# Your code here

Need a hint?

Use the @app.route decorator to create the logout route and define the logout function.

3

Clear the user session

Inside the logout function, clear the session using session.clear().

Flask

from flask import Flask, session, redirect

app = Flask(__name__)
app.secret_key = 'secret123'

@app.route('/logout')
def logout():
    # Clear the session here
    # Your code here

Need a hint?

Use session.clear() to remove all data stored in the user session.

4

Redirect to homepage after logout

After clearing the session in the logout function, return a redirect to the homepage using return redirect('/').

Flask

from flask import Flask, session, redirect

app = Flask(__name__)
app.secret_key = 'secret123'

@app.route('/logout')
def logout():
    session.clear()
    # Redirect to homepage
    # Your code here

Need a hint?

Use return redirect('/') to send the user back to the homepage after logout.