類型錯誤：找不到模塊正文解析器

Question

我嘗試自己制作一個項目，但發生了這個錯誤。 我無法修復它。 它只是不知何故發生了，我很困惑從哪里開始尋找錯誤。

應用程序.js

const path = require('path');

const express = require('express');
const bodyParser = require('body-parser');

const app = express();

app.set('view engine', 'ejs');
app.set('views', 'views');

const adminData = require('./routes/admin');
const shopRoutes = require('./routes/shop');

app.use(bodyParser.urlencoded({ extended: false }));
app.use(express.static(path.join(__dirname, 'public')));

app.use('/admin', adminData.routes);
app.use(shopRoutes);

app.use((req, res, next) => {
  res.status(404).render('404', { pageTitle: 'Page Not Found' });
});
app.listen(3000);

管理.js

const path = require('path');

const express = require('express');

const rootDir = require('../util/path');

const router = express.Router();

const products = [];

// /admin/add-product => GET
router.get('/add-product', (req, res, next) => {
  res.render('add-product', {
    pageTitle: 'Add Product',
    path: '/admin/add-product',
    formsCSS: true,
    productCSS: true,
    activeAddProduct: true
  });
});

// /admin/add-product => POST
router.post('/add-product', (req, res, next) => {
  products.push({ title: req.body.title });
  res.redirect('/');
});

exports.routes = router;
exports.products = products;

商店.js

shop.js 的代碼片段

這是我的錯誤。 我是第一次使用這個制作網頁。

 internal/modules/cjs/loader.js:638 throw err; ^ Error: Cannot find module 'body-parser' at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15) at Function.Module._load (internal/modules/cjs/loader.js:562:25) at Module.require (internal/modules/cjs/loader.js:692:17) at require (internal/modules/cjs/helpers.js:25:18) at Object.<anonymous> (C:\\Users\\User\\Documents\\My Website\\05-working-on-layout-with-partials\\app.js:4:20) at Module._compile (internal/modules/cjs/loader.js:778:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10) at Module.load (internal/modules/cjs/loader.js:653:32) at tryModuleLoad (internal/modules/cjs/loader.js:593:12) at Function.Module._load (internal/modules/cjs/loader.js:585:3) [nodemon] app crashed - waiting for file changes before starting...

Answer 1

請嘗試安裝所需的 body-parser 模塊，使用以下命令進行安裝。

npm install body-parser

Answer 2

請安裝依賴項，即body-parser

npm i body-parser --save

錯誤在app.js的第 4 行，它沒有獲取body-parser模塊