Javascript TypeError:express不是函数- Express代码“const app=Express（）”不起作用！！ **嗨，我这里有点问题！我的控制台返回此错误，但我遵循最佳方式！请某人 给我一盏灯。

server.js存档：

import * as express from "express";
import * as mongoose from "mongoose";
//inciando o app
const app = express();

//iniciando o banco de dados
mongoose.connection('mongodb://localhost:27017/program01', {useNewUrlParser: true});

//primeira rota
app.get('/',(req,res)=>{
    res.send('Hello World')
})

app.listen(3000)


==============================
console: 

*[nodemon] restarting due to changes...
[nodemon] starting `node server.js`
[nodemon] restarting due to changes...
(node:12020) ExperimentalWarning: The ESM module loader is experimental.
[nodemon] starting `node server.js`
(node:8472) ExperimentalWarning: The ESM module loader is experimental.
file:///C:/Users/USUARIO/Documents/Project%20Web/program01/server.js:4
const app = express();
            ^

TypeError: express is not a function
    at file:///C:/Users/USUARIO/Documents/Project%20Web/program01/server.js:4:13        
    at ModuleJob.run (internal/modules/esm/module_job.js:137:37)
    at async Loader.import (internal/modules/esm/loader.js:179:24)
[nodemon] app crashed - waiting for file changes before starting...* ```


another's archives :
**node_modules**
**package.json**
**package-lock.json**
**yarn-error.log**

---

您需要为

express

使用默认导入，即

import express from 'express';

而不是

import * as express from 'express';

---

导入是ES6的一项功能，Node.js尚未完全支持它 您应该使用require

const express = require('express')
const app = express()

---

我以前试过这个。控制台说ReferenceError:require未定义您正在使用的

node.js

的版本是什么？使用

节点-v

节点查找：v12.18.1控制台显示“引用错误：未定义要求”