I am using this code to send data to the front end and then redirect it to another function. @app.route('/get_destination_data', methods=['GET', 'POST']) def get_destination_data(): data = request.get_json() return jsonify({'redirect': url_for("show_destination_info", city_info=data)}) @app.route('/show_destination_info/<city_info>', methods=['GET', 'POST']) def show_destination_info(city_info): return render_template('city-info.html', data=eval(city_info), lists=UserLists.query.filter_by(user_id=current_user.id).all())…