Javascript 类型错误：找不到模块体分析器

我试着自己做一个项目，但这个错误发生了。我修不好。它不知怎么发生了，我很困惑从哪里开始寻找错误

app.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);

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;

admin.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);

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;

shop.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);

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;

shop.js的代码片段

这是我的错误。 我是第一次用这个做网页

internal/modules/cjs/loader.js:638
犯错误；
^
错误：找不到模块“正文分析器”
位于Function.Module.\u resolveFilename（internal/modules/cjs/loader.js:636:15）
at Function.Module._load（内部/modules/cjs/loader.js:562:25）
at Module.require（内部/modules/cjs/loader.js:692:17）
根据需要（内部/modules/cjs/helpers.js:25:18）
反对。（C:\Users\User\Documents\My Website\05使用partials进行布局\app.js:4:20）
at模块编译（内部/modules/cjs/loader.js:778:30）
at Object.Module._extensions..js（internal/modules/cjs/loader.js:789:10）
at Module.load（内部/modules/cjs/loader.js:653:32）
在tryModuleLoad（内部/modules/cjs/loader.js:593:12）
at Function.Module._load（内部/modules/cjs/loader.js:585:3）
[nodemon]应用程序崩溃-在启动之前等待文件更改…

请安装依赖项，即

正文解析器

NPMIbody解析器——保存

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app.js的第4行出现错误

未获取

主体解析器

模块

请尝试安装所需的主体解析器模块， 使用以下命令执行此操作

npm install body-parser

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这对我有用。我收到了相同的错误消息，这就解决了它。答案现在对我来说是显而易见的，但作为新的反应，我不知道。非常感谢。