The problem:
If you are using a mac and install nodejs via pkg file downloaded from the <a target="_blank" href="http://nodejs.org/">official website</a>, you are likely to encounter this error message when you try to install an npm module globally:
<pre><code>npm ERR! Please try running this command again as root/Administrator.
</code></pre>My solution
DO NOT use sudo command to install the package!
<pre><code>sudo npm install module -g
</code></pre>Some people suggest the above solution on Stack Overflow, but I strongly encourage you not to do package management with sudo. This hack may temporarily solve your problem, but you will encounter more problems later on.
Here is the recommended way:
Step 1: Find out your username with this command:
<pre><code>whoami
</code></pre>For example, my username is victorleungtw
Step 2: Change ownership of the node modules folder:
<pre><code>sudo chown -R `whoami` /usr/local/lib/node_modules
</code></pre>Then you won’t ever have to use sudo when you install npm packages.
Originally published at <a target="_blank" href="http://victorleungtw.com/npm/">victorleungtw.com</a> on February 20, 2015.


The problem:

If you are using a mac and install nodejs via pkg file downloaded from the [official website](http://nodejs.org/), you are likely to encounter this error message when you try to install an npm module globally:

```
npm ERR! Please try running this command again as root/Administrator.
```


**My solution**

DO NOT use sudo command to install the package!

```
sudo npm install module -g
```


Some people suggest the above solution on Stack Overflow, but I strongly encourage you not to do package management with sudo. This hack may temporarily solve your problem, but you will encounter more problems later on.

Here is the recommended way:

**Step 1:** Find out your username with this command:

```
whoami
```


For example, my username is victorleungtw

**Step 2:** Change ownership of the node modules folder:

```
sudo chown -R `whoami` /usr/local/lib/node_modules
```


Then you won’t ever have to use sudo when you install npm packages.

*Originally published at [victorleungtw.com](http://victorleungtw.com/npm/) on February 20, 2015.*

Common npm permission issue