我有下面的节点js代码,它在本地工作得很好,但是当我将其部署到heroku时,出现错误消息“错误:找不到模块'express' 内部/模块/cjs/loader.js:968抛出错误”
const port = process.env.PORT || 5000;
const express = require('express');
require('dotenv').config();
const app = express();
app.set('view-engine','ejs');
app.use(express.urlencoded({extended:false}));
app.get('/',(req,res) => {
res.render('index.ejs');
});
app.listen(port, ()=>{console.log(`Listening on http://localhost:${port}`)});
package.json
{
"name": "mtNodeApp",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "node index.js",
"devStart": "nodemon index.js"
},
"author": "",
"license": "ISC",
"devDependencies": {
"bcrypt": "^5.0.0",
"body-parser": "^1.19.0",
"dotenv": "^8.2.0",
"ejs": "^3.1.3",
"express": "^4.17.1",
"mongoose": "^5.10.0",
"nodemon": "^2.0.4",
"request": "^2.88.2"
}
}
任何想法,我不确定我缺少什么吗?!
谢谢
答案 0 :(得分:2)
Express必须位于dependencies
而非devDependecies
上:
{
...
"dependencies" {
"express": "^4.17.1",
...
}
"devDependecies": {
...
}
此外,可能大多数都必须位于dependencies
中,以便服务器知道必须安装的内容。基本上,它会忽略模块的安装,因为这些模块是用于开发而非生产的。
编辑:如果您想了解更多信息,可以阅读这个好答案。