How can I handle JWT errors in Flask?

How can I handle JWT errors in Flask?

You can handle JWT errors in Flask by using the jwt_required decorator and catching exceptions from the flask_jwt_extended library.

What kind of errors should I be looking out for?

Common errors include expired tokens, invalid tokens, and missing tokens. You can catch these using specific exception classes.

Can you show me a code example?

Sure! Here's a simple example:

from flask import Flask, jsonify
from flask_jwt_extended import JWTManager, jwt_required, get_jwt_identity, JWTError

app = Flask(__name__)
app.config['JWT_SECRET_KEY'] = 'your_secret_key'
jwt = JWTManager(app)

@jwt.unauthorized_loader
def unauthorized_response(callback):
    return jsonify({'msg': 'Missing or invalid token'}), 401

@jwt.expired_token_loader
def expired_token_response(callback):
    return jsonify({'msg': 'Token has expired'}), 401

@app.route('/protected', methods=['GET'])
@jwt_required()
def protected():
    current_user = get_jwt_identity()
    return jsonify(logged_in_as=current_user), 200

What if I want to customize the error messages?

You can customize error messages by modifying the response in the error handlers, like the unauthorized_loader and expired_token_loader functions.