Flask NameError: name ‘jsonify‘ is not defined

from flask import Flask
import json

app = Flask(__name__)

@app.route('/json2')
def demo2():
    json_demo = '{"age": 10, "name": "meng", "area": "CHN"}'
    # dumps将json转换为字典
    result=json.loads(json_demo)
    return result


 
if __name__ == '__main__':
    app.run(debug=True)

# 为str
json_demo = '{"age": 10, "name": "meng", "area": "CHN"}'