Node.js 使用Rest客户端、Express和NodeJs发送post请求时出错

Router.js文件 这是通过Rest客户端传递json数据的正确方法，Rest客户端发送application/json类型的对象

const express = require('express')
const routing = express.Router()
const flightMethods = require("../model/users")
//implement routing as per the given requirement
routing.post('/bookFlight', (req, res, err, next) => {
    flightBookingObj = JSON.parse(req.body);
    flightMethods.bookFlight(flightBookingObj).then((id) => {
       return res.status(201).json({"message": `Flight booking is successful with booking id ${id}`})
    })
    if(err){
       return next(err);
    }

})
module.exports = routing;

FlightBookingObj定义为

{"customerId": "P1001",
"bookingId": 2001,
 "noOfTickets": 3,
 "bookingCost": 1800,
 "flightId":undefined
 }

---

此路由的POST请求在REST客户端上出现错误。

下面是一段代码，用于使用Express在NodeJs中处理POST请求

main.js

class FlightBooking {
    constructor(obj) {
        this.customerId = obj.customerId;
        this.bookingId = obj.bookingId;
        this.noOfTickets = obj.noOfTickets;
        this.bookingCost = obj.bookingCost;
        this.flightId = obj.flightId;
    }
}

routes.js

    const express = require('express');
    const routing = require('./routes.js');
    const app = express();
    app.use('/', routing);
    var server = app.listen(3000, function(){
    });

---

错误是什么样子的？。。。。发布错误消息！错误：无法过帐/预订航班

    const express = require('express');
    var routing = express.Router();
    routing.route('/bookFlight').post(function(req, res, next)
    {
      var flightBookingObj = req.body.flight; 
      // Assuming your post request has an object called flight in its body

    });
    module.exports = routing;