How to install node.js on Linux Mint 18 Sarah

curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
sudo apt-get install -y nodejs

After that npm is also installed along with node.js. To check version of node write:

node -v

To check npm:

npm

To update npm to the latest version:

sudo npm install npm@latest -g

To fix npm permissions, first, create a folder in current user's home directory. Copy directory path to the newly created folder.

mkdir npm-global
cd npm-global
pwd

Set npm prefix setting to that folder.

npm config set prefix /home/current-user/npm-global

Add path /home/current-user/npm-global/bin to the system PATH settings. Open .profile file.

vi ~/.profile

Add following line to the file

export PATH=$PATH:/home/current-user/npm-global/bin

Reset settings by:

source ~/.profile