What are some examples of using JWT with Flask?

Can you give me some examples of how to use JWT with Flask?

Sure! JWT, or JSON Web Tokens, can be used in Flask for user authentication. One common example is creating a login route that generates a token upon successful authentication.

How do I create a login route that returns a JWT?

You can use the Flask-JWT-Extended library. First, install it, then create a route like this: @app.route('/login', methods=['POST']) and validate the user's credentials. If valid, use create_access_token(identity=user) to generate the token.

What about protecting routes with JWT?

To protect routes, use the @jwt_required() decorator from Flask-JWT-Extended. This ensures that only requests with a valid token can access the route.

Can you show me a complete example?

Absolutely! Here's a simple example:

from flask import Flask, request
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)

@app.route('/login', methods=['POST'])
def login():
    username = request.json.get('username')
    password = request.json.get('password')
    # Validate credentials here
    token = create_access_token(identity=username)
    return {'access_token': token}

@app.route('/protected', methods=['GET'])
@jwt_required()
def protected():
    return {'message': 'This is a protected route'}

This code sets up a basic JWT authentication system.