nodejs express 启动报错:Error: Cannot find module 'xxx',这是因为缺少模块的引用。
比如我在代码中使用了'express-session',但是却没有在package.json 文件的"dependencies" 项中添加'express-session' 的依赖
D:\nodejs\myapp>set DEBUG=myapp & npm start> myapp@0.0.0 start D:\nodejs\myapp> node ./bin/wwwmodule.js:340throw err;^Error: Cannot find module 'express-session'at Function.Module._resolveFilename (module.js:338:15)at Function.Module._load (module.js:289:25)at Module.require (module.js:366:17)at require (module.js:385:17)at Object.<anonymous> (D:\nodejs\myapp\app.js:6:15)at Module._compile (module.js:435:26)at Object.Module._extensions..js (module.js:442:10)at Module.load (module.js:356:32)at Function.Module._load (module.js:313:12)at Module.require (module.js:366:17)
package.json 文件
{"name": "myapp","version": "0.0.0","private": true,"scripts": {"start": "node ./bin/www"},"dependencies": {"body-parser": "~1.15.2","cookie-parser": "~1.4.3","debug": "~2.2.0","ejs": "^2.5.5","express": "~4.14.0","express-session": "^1.14.2","mongoose": "^4.7.6","morgan": "~1.7.0","serve-favicon": "~2.3.0"}}
如果你手动在package.json 文件中添加依赖的话,就需要在你的项目目录(我的目录是:D:\nodejs\myapp)下执行:npm install
还有一个方法是执行:npm install 模块名称 --save
D:\nodejs\myapp>npm install express-session --saveexpress-session@1.14.2 node_modules\express-session├── on-headers@1.0.1├── cookie-signature@1.0.6├── utils-merge@1.0.0├── cookie@0.3.1├── parseurl@1.3.1├── depd@1.1.0├── crc@3.4.1└── uid-safe@2.1.3 (base64-url@1.3.3, random-bytes@1.0.0)
记得把我这里提到的'xxx'或'express-session' 替换为你遇到 的错误信息中提示的模块名称哦!
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