First download and install Node JS application.
Node.js 6 or higher is required.

If you have older nexl version installed globally with npm first uninstall it:
npm uninstall nexl -g

To install nexl type the following in the command line:
npm i nexl -g

Then type the following to start nexl server:

After that open your Web browser and navigate to the following URL:

Linux users

Linux users should use sudo command to install and run npm packages globally:
sudo npm i nexl -g
sudo nexl
Another alternative is to change npm global packages location.
Click here to see how.
After that you can install and run nexl without sudo command.