对于MAC用户，以下步骤对我来说是有效的。

如果你得到Error for Brew，下面是你需要在终端中首先输入的命令:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Then run following commands:

$ brew update
$ brew uninstall node
$ brew install node
$ brew postinstall 

使用visudo将npm二进制路径添加到sudo路径并编辑“secure_path”

现在“sudo npm”工作了

而不是重新安装节点，这似乎是公认的解决方案，问题是没有权限到nodejs文件夹/usr/local。 输入如下命令sudo chmod -R 777 /usr/local/nodejs/

I had the same issue,the reason for it was npm package manager was not installed while installing node. This was caused because of the following mistake: In the installation process there is a step called "Custom Setup", here you have the option to choose one of the following: 1) Node.js runtime (This is selected by default). 2) npm package manager 3) Online documentation shortcuts. 4) Add to Path. If you proceed as it is npm package manager will not be installed and hence you will get the error.

解决方案: 当你得到这些选项时，选择npm包管理器。 这对我很管用。

npm文件应该在/usr/local/bin/npm.如果没有，请在他们的网站上重新安装node.js。这对我来说很管用。

完全移除节点:

  brew uninstall --force node

安装:

brew install node;
which node # => /usr/local/bin/node
export NODE_PATH='/usr/local/lib/node_modules'