问Axios POST导致NULL

EN

@app.route("/", methods=['GET','POST'])
@cross_origin()
def helloWorld():
    data = request.json
    return jsonify(data)

axios.post('http://127.0.0.1:5000/', {
    firstName: 'Fred',
    lastName: 'Flintstone'
      })
      .then(function (response) {
        console.log(response.data);
      })
      .catch(function (error) {
        console.log(error);
      });

axios
      .get('http://127.0.0.1:5000')
      .then(response => console.log(response))
      .catch(error => console.log(error))