Need help to install Mosca

[fubax]

I need a newbie help to install mosca on RPI3. when I run the following command I get this error:

pi@raspberrypi:~$ npm install mosca pino -g
npm ERR! tar.unpack untar error /home/pi/.npm/pino/3.0.4/package.tgz
npm ERR! tar.unpack untar error /home/pi/.npm/mosca/2.2.0/package.tgz
npm ERR! Linux 4.1.18-v7+
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install" "mosca" "pino" "-g"
npm ERR! node v4.3.1
npm ERR! npm  v2.14.12
npm ERR! path /usr/lib/node_modules/pino
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall mkdir

npm ERR! Error: EACCES: permission denied, mkdir '/usr/lib/node_modules/pino'
npm ERR!     at Error (native)
npm ERR!  { [Error: EACCES: permission denied, mkdir '/usr/lib/node_modules/pino']
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'mkdir',
npm ERR!   path: '/usr/lib/node_modules/pino',
npm ERR!   fstream_type: 'Directory',
npm ERR!   fstream_path: '/usr/lib/node_modules/pino',
npm ERR!   fstream_class: 'DirWriter',
npm ERR!   fstream_stack:
npm ERR!    [ '/usr/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:35:25',
npm ERR!      '/usr/lib/node_modules/npm/node_modules/mkdirp/index.js:47:53',
npm ERR!      'FSReqWrap.oncomplete (fs.js:82:15)' ] }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/pi/npm-debug.log
pi@raspberrypi:~$

[mcollina]

Read: https://docs.npmjs.com/getting-started/fixing-npm-permissions