How to Install npm in Ubuntu Linux operating system

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To be able to build a web-based application using express framework to be executed in Node.js, there are lots of situation where the usage of ‘npm’ is actually needed. This is quite obvious since based on the manual page given by typing ‘man npm’, it is clearly explained that npm is a javascript package manager. Precisely, in the description section of the manual page, it is stated that npm is the package manager for the Node Javascript platform. As we already knew, ‘node’ or ‘nodejs’ is the tool provided for executing Server-side Javascript where the script itself needs several modules or library addition which is provided by the help of ‘npm’. One of the case is described in the following situation where there is a need to add or to install the last module or library for MySQL Database connection as shown below :

user@hostname:~/nodejs/crud$ npm install mysql
The program 'npm' is currently not installed. You can install it by typing:
sudo apt install npm
user@hostname:~/nodejs/crud$

Switch to ‘root’ account as shown below :

user@hostname:~/nodejs/crud$ sudo su - 
Password:
root@hostname:~#

Type the following command ‘apt-get -y install npm’ to start installing npm :

root@hostname:~# apt-get -y install npm
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  comerr-dev krb5-multidev libgssrpc4 libkadm5clnt-mit9 libkadm5srv-mit9 libkdb5-8
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  gyp libjs-inherits libjs-node-uuid libuv1-dev node-abbrev node-ansi node-ansi-color-table node-archy node-async node-block-stream node-combined-stream node-cookie-jar
  node-delayed-stream node-forever-agent node-form-data node-fstream node-fstream-ignore node-github-url-from-git node-glob node-graceful-fs node-gyp node-inherits node-ini
  node-json-stringify-safe node-lockfile node-lru-cache node-minimatch node-mute-stream node-node-uuid node-nopt node-normalize-package-data node-npmlog node-once node-osenv
  node-read node-read-package-json node-request node-retry node-rimraf node-semver node-sha node-sigmund node-slide node-tar node-tunnel-agent node-underscore node-which
  nodejs-dev
Suggested packages:
  node-hawk node-aws-sign node-oauth-sign node-http-signature debhelper
The following NEW packages will be installed:
  gyp libjs-inherits libjs-node-uuid libuv1-dev node-abbrev node-ansi node-ansi-color-table node-archy node-async node-block-stream node-combined-stream node-cookie-jar
  node-delayed-stream node-forever-agent node-form-data node-fstream node-fstream-ignore node-github-url-from-git node-glob node-graceful-fs node-gyp node-inherits node-ini
  node-json-stringify-safe node-lockfile node-lru-cache node-minimatch node-mute-stream node-node-uuid node-nopt node-normalize-package-data node-npmlog node-once node-osenv
  node-read node-read-package-json node-request node-retry node-rimraf node-semver node-sha node-sigmund node-slide node-tar node-tunnel-agent node-underscore node-which
  nodejs-dev npm
0 upgraded, 49 newly installed, 0 to remove and 28 not upgraded.
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root@hostname:~#

After successfully installing ‘npm’, just type the following command to test whether the ‘npm’command can be executed :

user@hostname:/usr/bin$ npm

Usage: npm 

where  is one of:
    access, add-user, adduser, apihelp, author, bin, bugs, c,
    cache, completion, config, ddp, dedupe, deprecate, dist-tag,
    dist-tags, docs, edit, explore, faq, find, find-dupes, get,
    help, help-search, home, i, info, init, install,
    install-test, issues, it, la, link, list, ll, ln, login,
    logout, ls, outdated, owner, pack, ping, prefix, prune,
    publish, r, rb, rebuild, remove, repo, restart, rm, root,
    run-script, s, se, search, set, show, shrinkwrap, star,
    stars, start, stop, t, tag, team, test, tst, un, uninstall,
    unlink, unpublish, unstar, up, update, upgrade, v, verison,
    version, view, whoami

npm  -h     quick help on 
npm -l           display full usage info
npm faq          commonly asked questions
npm help   search for help on 
npm help npm     involved overview

Specify configs in the ini-formatted file:
    /home/user/.npmrc
or on the command line via: npm  --key value
Config info can be viewed via: npm help config

npm@3.5.2 /usr/share/npm
user@hostname:/usr/bin$

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