node.js,错误:找不到模块'express' [英] node.js, Error: Cannot find module 'express'
问题描述
我是node.js的新手,尝试学习express来构建我的第一个Web应用程序。被困在我的第一个示例代码上。需要一些帮助才能使其运行。在我发布这个问题之前,我在堆栈溢出搜索,发现一些类似的问题,但仍然无法解决它。
错误:找不到模块'express'
我使用的是Mac OS 10.8.2。我使用nvm安装了node.js。
node.js:0.8.20路径到节点:/Users/feelexit/nvm/v0.8.20/bin/node
路径来表达:/ Users / feelexit / nvm / node_modules / express
这是我的示例代码:这个文件位于: p>
/Users/feelexit/WebstormProjects/learnnode/node_modules/index.js
var express = require('express');
var app = express();
app.get('/',function(req,res){
res.send('welcome to express');
});
app.listen(3000);
当我尝试运行此文件node index.js
我收到以下错误信息,请帮我修复。谢谢。
错误:找不到module'express'
在Function.Module._resolveFilename(module.js: 338:15)
在Function.Module._load(module.js:280:25)
在Module.require(module.js:362:17)
at require(module.js :378:17)
在Object。< anonymous> (/Users/feelexit/WebstormProjects/learnnode/node_modules/index.js:1:81)
在Module._compile(module.js:449:26)
在Object.Module._extensions..js (module.js:467:10)
在Module.load(module.js:356:32)
在Function.Module._load(module.js:312:12)
at Module.runMain(module.js:492:10)
feelexits-Mac:node_modules feelexit $
更新以回答chovy的问题:
feelexits-Mac:〜feelexit $ npm install
npm ERR!安装无法读取依赖项
npm ERR!错误:ENOENT,打开'/Users/feelexit/package.json'
npm ERR!如果您需要帮助,可以在以下位置报告此日志:
npm ERR! < HTTP://github.com/isaacs/npm/issues>
npm ERR!或发送电子邮件至:
npm ERR! < npm-@googlegroups.com>
npm ERR!系统达尔文12.2.0
npm ERR!命令/Users/feelexit/nvm/v0.8.20/bin/node/Users/feelexit/nvm/v0.8.20/bin/npm安装
npm ERR! cwd / Users / feelexit
npm ERR!节点-v v0.8.20
npm ERR! npm -v 1.2.11
npm ERR!路径/Users/feelexit/package.json
npm ERR!代码ENOENT
npm ERR!错误34
npm ERR!
npm ERR!额外的日志记录详细信息可以在以下位置找到:
npm ERR! /Users/feelexit/npm-debug.log
npm ERR!不确定代码0
它说
找不到模块'express'
你有快速安装吗?如果没有,请运行这个。
npm install express
再次运行您的程序。
I am new to node.js, try to learn express to build my first web application. got stuck on my very first sample code. need some help to get it running. Before I post this question, I did search on stack overflow, found some similar questions but still could not fix it.
Error: Cannot find module 'express'
I am using mac os 10.8.2. I have node.js installed using nvm.
node.js: 0.8.20 path to node: /Users/feelexit/nvm/v0.8.20/bin/node path to express: /Users/feelexit/nvm/node_modules/express
here's my sample code: this file locates at:
/Users/feelexit/WebstormProjects/learnnode/node_modules/index.js
var express = require('express');
var app = express();
app.get('/', function(req, res){
res.send('welcome to express');
});
app.listen(3000);
when I try to run this file "node index.js"
I get following error message, please help me to fix it. thank you .
Error: Cannot find module 'express'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/Users/feelexit/WebstormProjects/learnnode/node_modules/index.js:1:81)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
feelexits-Mac:node_modules feelexit$
Update to answer chovy's question:
feelexits-Mac:~ feelexit$ npm install
npm ERR! install Couldn't read dependencies
npm ERR! Error: ENOENT, open '/Users/feelexit/package.json'
npm ERR! If you need help, you may report this log at:
npm ERR! <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR! <npm-@googlegroups.com>
npm ERR! System Darwin 12.2.0
npm ERR! command "/Users/feelexit/nvm/v0.8.20/bin/node" "/Users/feelexit/nvm/v0.8.20/bin/npm" "install"
npm ERR! cwd /Users/feelexit
npm ERR! node -v v0.8.20
npm ERR! npm -v 1.2.11
npm ERR! path /Users/feelexit/package.json
npm ERR! code ENOENT
npm ERR! errno 34
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /Users/feelexit/npm-debug.log
npm ERR! not ok code 0
It says
Cannot find module 'express'
Do you have express installed?If not then run this.
npm install express
And run your program again.
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