process.env() Method in Node.js

The process.argv() method is used for getting the user environment object. This object will contain all the information about the environment on which this command is being executed.
process.env()
Since it returns an object for the user environment. It does not need any inputs from the user as such.
Create a file with name – env.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −
node env.js
env.js
 Live Demo
// Node.js program to demonstrate the use of process.env

// Importing the process module
const process = require('process');

// Printing the user environment object
console.log(process.env);
admin@root:~/node/test$ node env.js
{ SHELL: '/bin/bash',
SESSION_MANAGER:
'local/admin:@/tmp/.ICE-unix/2956,unix/admin:/tmp/.ICE-unix/2956',
QT_ACCESSIBILITY: '1',
COLORTERM: 'truecolor',
XDG_CONFIG_DIRS: '/etc/xdg/xdg-ubuntu:/etc/xdg',
XDG_MENU_PREFIX: 'gnome-',
GNOME_DESKTOP_SESSION_ID: 'this-is-deprecated',
LANGUAGE: 'en_IN:en',
GNOME_SHELL_SESSION_MODE: 'ubuntu',
SSH_AUTH_SOCK: '/run/user/1001/keyring/ssh',
XMODIFIERS: '@im=ibus',
DESKTOP_SESSION: 'ubuntu',
SSH_AGENT_PID: '2912',
GTK_MODULES: 'gail:atk-bridge',
PWD: '/home/admin/test',
LOGNAME: 'admin',
XDG_SESSION_DESKTOP: 'ubuntu',
XDG_SESSION_TYPE: 'x11',
GPG_AGENT_INFO: '/run/user/1001/gnupg/S.gpg-agent:0:1',
XAUTHORITY: '/run/user/1001/gdm/Xauthority',
GJS_DEBUG_TOPICS: 'JS ERROR;JS LOG',
WINDOWPATH: '2',
HOME: '/home/admin',
USERNAME: 'admin',
IM_CONFIG_PHASE: '1',
LANG: 'en_IN',
LS_COLORS:

'rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31
;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz
=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tl
z=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=0
1;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01
;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=
01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab
=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01
;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:
*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=0
1;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=0
1;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:
*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35
:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;
35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mk
a=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;
36:*.spx=00;36:*.xspf=00;36:',
XDG_CURRENT_DESKTOP: 'ubuntu:GNOME',
VTE_VERSION: '6003',
GNOME_TERMINAL_SCREEN:
'/org/gnome/Terminal/screen/82170ab9_b5b3_424d_b0ce_37a40eb4e264',
INVOCATION_ID: '9f9745f4c0c546eaa78b2c84f6d7ae59',
MANAGERPID: '2722',
GJS_DEBUG_Output: 'stderr',
LESSCLOSE: '/usr/bin/lesspipe %s %s',
XDG_SESSION_CLASS: 'user',
TERM: 'xterm-256color',
LESSOPEN: '– /usr/bin/lesspipe %s',
USER: 'admin',
GNOME_TERMINAL_SERVICE: ':1.111',
DISPLAY: ':0',
SHLVL: '1',
QT_IM_MODULE: 'ibus',
XDG_RUNTIME_DIR: '/run/user/1001',
JOURNAL_STREAM: '9:66796',
XDG_DATA_DIRS:
'/usr/share/ubuntu:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop',
PATH:
'/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin',
GDMSESSION: 'ubuntu',
DBUS_SESSION_BUS_ADDRESS: 'unix:path=/run/user/1001/bus',
_: '/usr/bin/node',
OLDPWD: '/home/admin' }
Let's take a look at one more example.
 Live Demo
// Node.js program to demonstrate the use of process.env

// Importing the process module
const process = require('process');

// Printing object for process.env
var no_env = 0;

// Calling the process.env function
var env = process.env;

// Traversing through the returned data
for (var key in env) {
   // Printing values
   console.log(key + ":\t\t\t" + env[key]);
   no_env++;
}

// Printing total count
console.log("total no of values available = " + no_env);

// Accessing fields one by one
console.log("operating system: " + env['OS']);
console.log("alluserprofile: " + env['ALLUSERSPROFILE']);
console.log("public directory: " + env['PUBLIC']);
admin@root:~/node/test$ node env.js
SHELL:             /bin/bash
SESSION_MANAGER:   local/admin:@/tmp/.ICEunix/2956,unix/admin:/tmp/.ICE-unix/2956
QT_ACCESSIBILITY:  1
COLORTERM:         truecolor
XDG_CONFIG_DIRS:   /etc/xdg/xdg-ubuntu:/etc/xdg
XDG_MENU_PREFIX:   gnomeGNOME_DESKTOP_SESSION_ID: this-is-deprecated
LANGUAGE:          en_IN:en
GNOME_SHELL_SESSION_MODE: ubuntu
SSH_AUTH_SOCK:      /run/user/1001/keyring/ssh
XMODIFIERS:         @im=ibus
DESKTOP_SESSION:    ubuntu
SSH_AGENT_PID:      2912
GTK_MODULES:        gail:atk-bridge
PWD:                /home/admin/test
LOGNAME:            admin
XDG_SESSION_DESKTOP: ubuntu
XDG_SESSION_TYPE:   x11
GPG_AGENT_INFO:     /run/user/1001/gnupg/S.gpg-agent:0:1
XAUTHORITY:         /run/user/1001/gdm/Xauthority
GJS_DEBUG_TOPICS:   JS ERROR;JS LOG
WINDOWPATH:         2
HOME:               /home/admin
USERNAME:           admin
IM_CONFIG_PHASE:    1
LANG:               en_IN
LS_COLORS:
rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or
=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;
31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=0
1;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;3
1:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:
*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;
31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01
;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*
.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.t
ga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;3
5:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:
*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.n
uv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*
.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:
*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=
00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:
*.opus=00;36:*.spx=00;36:*.xspf=00;36:
XDG_CURRENT_DESKTOP:    ubuntu:GNOME
VTE_VERSION:            6003
GNOME_TERMINAL_SCREEN:
/org/gnome/Terminal/screen/82170ab9_b5b3_424d_b0ce_37a40eb4e264
INVOCATION_ID:          9f9745f4c0c546eaa78b2c84f6d7ae59
MANAGERPID:             2722
GJS_DEBUG_Output:       stderr
LESSCLOSE:             /usr/bin/lesspipe %s %s
XDG_SESSION_CLASS:     user
TERM:                   xterm-256color
LESSOPEN:             – /usr/bin/lesspipe %s
USER: admin
GNOME_TERMINAL_SERVICE: :1.111
DISPLAY:                :0
SHLVL:                   1
QT_IM_MODULE:            ibus
XDG_RUNTIME_DIR:         /run/user/1001
JOURNAL_STREAM:          9:66796
XDG_DATA_DIRS:
/usr/share/ubuntu:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop
PATH:
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/
bin
GDMSESSION:             ubuntu
DBUS_SESSION_BUS_ADDRESS: unix:path=/run/user/1001/bus
_: /usr/bin/node
OLDPWD:                /home/admin
total no of values available = 50
operating system:       undefined
alluserprofile:         undefined
public directory:       undefined