Express，請求正文在中間件中為{}，但在控制器中有內容

這是我的 server.js：

  import express from "express";
import mongoose from "mongoose";
import productRouter from "./routers/productRouter.js";
import dotenv from "dotenv";

dotenv.config();

const app = express();
app.use(express.json());
let prof = process.env.PROF;

mongoose.connect(
 `${prof}`
);

// Add headers before the routes are defined
app.use(function (req, res, next) {
  // Website you wish to allow to connect
  res.setHeader("Access-Control-Allow-Origin", "*");

  // Request methods you wish to allow
  res.setHeader(
    "Access-Control-Allow-Methods",
    "GET, POST, OPTIONS, PUT, PATCH, DELETE"
  );

  res.header("Access-Control-Allow-Headers", "Content-Type");
  // Request headers you wish to allow
  // res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

  // Set to true if you need the website to include cookies in the requests sent
  // to the API (e.g. in case you use sessions)
  res.setHeader("Access-Control-Allow-Credentials", true);

  // Pass to next layer of middleware
  next();
});
/*
app.get("/api/products", (req, res) => {
  res.send(data);
});*/

app.use("/api/products", productRouter);

app.get("/", (req, res) => {
  res.send("Server is ready");
});

const port = process.env.PORT || 5000;
app.listen(port);

進入 productRouter.js ...

  import express from "express";
import mongoose from "mongoose";
import data from "../data.js";
import Product from "../models/productModel.js";
import { payment } from "./paymentController.js";

const productRouter = express.Router();

productRouter.use("/pay", async (req, res, next) => {
  // dont store cart in db, store it in local storage. On checkout get Id of all items in cart. Then find their prices from the db and charge correctly.
  console.log("middleware ran");
  console.log(req.body);
  const productIdsAndAmounts = req.body.basketItems.items.map((item) => {
    return { id: item.id, amount: item.amount };
  });

  // this works faster (apparently)
  /*
  const objIds = productIds.map((id) => mongoose.Types.ObjectId(id));
  const orderedItems = await Product.find({
    _id: { $in: objIds },
  });
*/
  // this sends more query requests to db
  const orderedItems = await Promise.all(
    productIdsAndAmounts.map((productId) => {
      return Product.findById(productId.id);
    })
  );

  let i = -1;
  let productIdsPricesAmounts = [];
  orderedItems.forEach((item) => {
    i = i   1;
    productIdsPricesAmounts.push({
      id: item.id,
      price: item.price,
      amount: productIdsAndAmounts[i].amount,
    });
  });
  console.log(productIdsPricesAmounts);

  const prices = productIdsPricesAmounts.map((item) => {
    return item.price * item.amount;
  });
  const reducer = (prevValue, currValue) => prevValue   currValue;
  const totalTotalPrice = prices.reduce(reducer);

  console.log(totalTotalPrice);

  req.totalPrice = totalTotalPrice;

  //console.log(orderedItems);
  //console.log(productIdsAndAmounts);

  // console.log(req.body.user); // adres
  next();
});

productRouter.get("/", async (req, res) => {
  const products = await Product.find({});
  res.send(products);
});

productRouter.post("/pay", payment);

export default productRouter;

現在到 paymentController.js：

export const paymentController = async (req, res, next) => { 
console.log(req.body.basketItems)
/* returns contents of the body like expected, i can do whatever i want with it*/ 
}

我可以得到的行為是： 客戶端向“api/products/pay”發送請求，我可以訪問 paymentController 中的 req.body。

我想要的行為是： 客戶端向“api/products/pay”發送請求，請求首先通過一個中間件，我在其中對其進行一些計算，然后將新變數轉發給我的 paymentController。問題是 req.body 在中間件中是 {} productRouter.use()，但在 paymentController 中可用

What am I doing wrong ? I'm new to express and i don't exactly know what I'm doing yes. I want to have access to req.body inside productRouter. I'm guessing i set up the middleware wrong or something like that. But I can't see what i did wrong.

uj5u.com熱心網友回復：

您可以使用路由器嗎例如：

用戶.ts

import express from "express";
let UserRoute = express.Router()
UserRoute.get('/',function (req,res) {
    res.json('Hello World')
})

export { UserRoute }

應用程式

import express from "express";
import cors from "cors";
import {  UserRoute } from "./routes/v1/user"
const http = require('http');
const app = express();
const server = http.createServer(app);
const  PORT : string|number = process.env.PORT || 5000;
app.use(cors());
app.use(express.json());
app.use('/',UserRoute)



//Run Server And Listen To Port
server.listen(PORT,()=>{
    console.log("Server UP")
})

uj5u.com熱心網友回復：

猜猜這是您要添加中間件功能的主要路線 正確創建一個名為“abc”的中間函式從那里匯出為名稱“abc”

現在，在主要路線中，您可以將該功能用作中間件

productRouter.post("/pay",abc, payment);

這里 abc 是你的中間件功能

標籤：javascript node.js express request middleware

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