node.js 使用 npm 安装后在 bash 中找不到 express 命令

express command not found in bash after installing it with npm

提问by Sander

just installed new ubuntu vm to test around with node installed things in this order:

刚刚安装了新的 ubuntu vm 以按以下顺序使用节点安装的东西进行测试：

node
mongodb-server
npm
express
mongoose

now, trying to create a new app i noticed express cannot be used in the shell. express -vreturns express: command not found

现在，尝试创建一个新的应用程序，我注意到 express 无法在 shell 中使用。 express -v返回快递：找不到命令

i installed npm like this

我像这样安装了 npm

curl http://npmjs.org/install.sh | sudo sh

and i installed express this way

我以这种方式安装了快递

npm install express

any ideas?

有任何想法吗？

回答by Fazi

Starting from express 4.00 you also need to install express generator with:

从 express 4.00 开始，您还需要安装 express 生成器：

npm install -g express-generator

Only after this will you be able to run express as a command!

只有在此之后，您才能将 express 作为命令运行！

For confirmation see: ExpressJS.com - Migrating to Express 4

如需确认，请参阅：ExpressJS.com - 迁移到 Express 4

回答by Raynos

npm install express -g

npm install express -g

You need to install it globally.

您需要全局安装它。

Npm 1.0 installs modules locally by default. So the bash executable lives in /node_modules/bin/. You can add that folder to PATHor you can just install expressglobally so that it's picked up by PATH

Npm 1.0 默认在本地安装模块。所以 bash 可执行文件存在于/node_modules/bin/. 您可以将该文件夹添加到，PATH或者您可以express全局安装，以便它被PATH

回答by Warren Reilly

I had this problem and was installing node via Homebrew. The problem was being caused by Homebrew.

我遇到了这个问题，正在通过 Homebrew 安装节点。问题是由 Homebrew 引起的。

So I did:

所以我做了：

brew uninstall node

and then installed node using the installer on the nodejs.orgsite.

然后使用nodejs.org站点上的安装程序安装节点。

Then I ran:

然后我跑了：

npm install -g express

And voila no problems.

瞧，没有问题。

回答by hippopots

EDIT2017-06-29: this answer is 6+ years old, but still gets votes/traffic. Instead (for any new users with problems)I'd trust both NODE_PATHofficial docand its corresponding bit about REPL usagebefore this answer.

编辑2017-06-29：这个答案已有 6 年以上的历史，但仍然获得选票/流量。相反（对于任何有问题的新用户），在此答案之前，我会信任NODE_PATH官方文档及其有关 REPL 使用的相应部分。

Quite similar to this issue, node was not finding my global express install, so a require('express')statement would fail.

与此问题非常相似，节点没有找到我的全局快速安装，因此require('express')语句将失败。

What fixed this for me, when a global install wasn't being picked up by node was making sure NODE_PATHenv. variablewas is set correctly. On Ubuntu 11.04, with node version 0.5.0-pre, the paths me were:

当节点没有选择全局安装时，为我解决了这个问题的是确保NODE_PATHenv. 变量was 设置正确。在 Ubuntu 11.04 上，节点版本为 0.5.0-pre，我的路径是：

NODE_PATH=/usr/local/lib/node_modules:/usr/local/lib/node

So, to clarify you might want to export the above env. variable, or you can just test the above values out by doing:

因此，为了澄清您可能想要导出上述 env。变量，或者您可以通过执行以下操作来测试上述值：

NODE_PATH=/usr/local/lib/node_modules:/usr/local/lib/node node ./you_app.js

回答by Asaf Manassen

With the release of Express 4.0.0 it looks like you need to do sudo npm install -g express-generator.

随着 Express 4.0.0 的发布，您似乎需要做 sudo npm install -g express-generator.

回答by maudulus

I had to do a combination of things:

我不得不做一些事情：

1. From node.js modules path:

   echo 'export NODE_PATH="'$(npm root -g)'"' >> ~/.bash_profile && . ~/.bash_profile
   

   This sets the file path in bash profile (can be viewed using nano .bash_profile

2. Slightly modified from Raynos (above) since I needed sudo:

   sudo npm install express -g
   

3. Slightly modified from Fazi (above) since I needed sudo:

   sudo npm install -g express-generator
   

1. 从node.js 模块路径：

   echo 'export NODE_PATH="'$(npm root -g)'"' >> ~/.bash_profile && . ~/.bash_profile
   

   这将设置 bash 配置文件中的文件路径（可以使用 nano .bash_profile

2. 由于我需要，从 Raynos（上图）稍作修改sudo：

   sudo npm install express -g
   

3. 由于我需要，对 Fazi（上图）稍作修改sudo：

   sudo npm install -g express-generator
   

TEST YOUR APPLICATION:

测试您的应用程序：

run `DEBUG=myapp:* npm start`

Ref: http://expressjs.com/en/starter/generator.html

参考：http: //expressjs.com/en/starter/generator.html

回答by Mark Karwowski

IF you are running windows:

如果您正在运行 Windows：

export NODE_PATH="C:\Users\IMarek\AppData\Roaming\npm\node_modules"