app.py

# List users
@app.route("/user", methods=["GET"])
def get_all_users():
    users = User.query.all()
    output = []
    for user in users:
        user_data = {}
        user_data["id"] = user.id
        user_data["username"] = user.username
        user_data["admin"] = user.admin
        output.append(user_data)
    return jsonify({"users": output}), 200