JSON Web Tokens (JWT) are a popular method for handling authentication in web applications. They allow you to securely transmit information between parties as a JSON object. In Flask, JWT can help you validate users and protect your API endpoints efficiently. In this article, we’ll explore three diverse, practical examples of implementing JWT authentication in Flask, each with its own context and use case.
In this example, we’ll create a simple user login system using JWT. This is suitable for applications requiring user authentication.
First, ensure you have Flask and the necessary libraries installed:
pip install Flask Flask-JWT-Extended
We will create a basic Flask app that allows users to log in and receive a JWT.
```python
from flask import Flask, request, jsonify
from flask_jwt_extended import JWTManager, create_access_token, jwt_required
app = Flask(__name__)
app.config[’JWT_SECRET_KEY’] = ‘your_secret_key’
jwt = JWTManager(app)
users = {’user1’: ‘password1’, ‘user2’: ‘password2’}
@app.route(’/login’, methods=[’POST’])
def login():
username = request.json.get(’username’)
password = request.json.get(’password’)
if username in users and users[username] == password:
access_token = create_access_token(identity=username)
return jsonify(access_token=access_token), 200
return jsonify({