node.js npm 命令未找到错误但节点已安装
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npm command not found error but node is installed
提问by OneMoreQuestion
I installed node and npm with Homebrew a while ago, they both worked fine until today when I keep running into the npm command not founderror.
不久前我用 Homebrew 安装了 node 和 npm，直到今天我一直遇到npm 命令未找到错误时，它们都运行良好。
When is run $ whereis node, I get nothing back
何时运行$ whereis node，我一无所获
When I do $ which node, I see /usr/local/bin/node
当我执行$ which node 时，我看到/usr/local/bin/node
When I do $ node -v, I see v4.4.7
当我执行$ node -v 时，我看到v4.4.7
When I do $ whereis npm, I get nothing back
当我执行$ whereis npm 时，我一无所获
When I do $ which npm, I get nothing back
当我执行$ which npm 时，我一无所获
When I do $ npm -v, I see -bash: npm: command not found
当我执行$ npm -v 时，我看到-bash: npm: command not found
I have tried
我试过了
$ brew update
$ brew uninstall npm
$ brew install npm
I have also made sure that my $NODE_PATHenvironment variable is set:
我还确保设置了我的$NODE_PATH环境变量：
# In ~/.bash_profile file:
export NODE_PATH="/usr/local/lib/node_modules"
I also followed these instructions from https://himanen.info/solved-npm-command-not-found/
我还遵循了https://himanen.info/solved-npm-command-not-found/ 中的这些说明
Nothing seems to work and I keep getting npm: command not foundwhen I run any command in any folder with npm. Any ideas? Thanks
似乎没有任何效果，当我使用 npm 在任何文件夹中运行任何命令时，我不断收到npm: command not found。有任何想法吗？谢谢
回答by OneMoreQuestion
Figured out the issue. So the root of the problem was that I installed npm using Homebrew and there are some issues with what goes on under the hood with Homebrew and npm.
想通了这个问题。所以问题的根源是我使用 Homebrew 安装了 npm，并且 Homebrew 和 npm 的幕后发生了一些问题。
To fix this I did the following:
为了解决这个问题，我做了以下事情：
rm -rf /usr/local/lib/node_modules
brew uninstall node
brew install node --without-npm
echo prefix=~/.npm-packages >> ~/.npmrc
curl -L https://www.npmjs.com/install.sh | sh
Important!Do this in .bash_profile
重要的！在 .bash_profile 中执行此操作
export PATH="$HOME/.npm-packages/bin:$PATH"
export PATH="$HOME/.node/bin:$PATH"
Now everything works like a charm
现在一切都像魅力一样
回答by S.Yadav
I had the same issue, I am using a MAC.
It was a permission issue in my case, here is what I already did:
我有同样的问题，我正在使用MAC。
在我的情况下，这是一个许可问题，这是我已经做的：
$ brew update
$ brew uninstall npm
$ brew install npm
That didn't work for me, so I tried this:
这对我不起作用，所以我尝试了这个：
$ sudo chmod -R 777 /usr/local/lib
$ brew postinstall node
and this linked installed node with npm, when I typed:
当我输入以下内容时，这个链接的已安装节点与 npm 连接：
$ npm -v
5.3.0
Now all commands followed by NPM are working fine,
like npm install
现在 NPM 后面的所有命令都可以正常工作，
例如npm install
Hope this will work for all!!
希望这对所有人都有效！！
回答by Sridhar
In mac via homebrew, when you are getting error like
在 mac 中通过自制软件，当你收到类似的错误时
Error: Permission denied @ dir_s_mkdir - /usr/local/lib/node_modules/npm
or mostly getting several folder permission, don't give full permission like
或者主要是获得多个文件夹权限，不要给予完全权限，例如
$ sudo chmod -R 777 /usr/local/lib
Please use as mentioned below
请按如下方式使用
$ sudo chown -R $(whoami):admin /usr/local/lib/node_modules/
What it will do, simply gives the ownership to the user (linux users also can use this).
它会做什么，只是将所有权授予用户（Linux 用户也可以使用它）。
Hint: And in mac please use homebrew for installation. Advantages of homebrew you can switch between versions, easy to uninstall, you no need to run as root (sudo), like wise lots of advantages are there, as a developer its recommended to use homebrew (https://brew.sh/). And one more thing whenever you are getting some error like permission denied or something don't, give the full permission instead of using chmoduse chown.
提示：在 mac 中请使用 homebrew 进行安装。自制软件的优点，您可以在版本之间切换，易于卸载，您无需以 root 身份运行（sudo），就像有很多优点一样，作为开发人员，建议使用自制软件（https://brew.sh/） . 还有一件事，每当您遇到诸如权限被拒绝或某些错误之类的错误时，请提供完整权限，而不是使用chmoduse chown。
回答by Rajeev Jayaswal
I had the same issue, I executed following command to install node and npm - it worked perfectly.
我遇到了同样的问题，我执行了以下命令来安装 node 和 npm - 它运行良好。
rm -rf /usr/local/lib/node_modules
brew uninstall node
brew install node
