Propiedad Node.js process.env

Posted on by Rudeus Greyrat

La propiedad process.env es una interfaz de programación de aplicaciones incorporada del módulo de proceso que se utiliza para obtener el entorno del usuario. Sintaxis:

process.env

Valor devuelto: esta propiedad devuelve un objeto que contiene el entorno del usuario. Los siguientes ejemplos ilustran el uso de la propiedad process.env en Node.js: Ejemplo 1: 

javascript

// Node.js program to demonstrate the
// process.env Property
  
// Include process module
const process = require('process');
 
// Printing process.env property value
console.log(process.env);

Producción:

{ ALLUSERSPROFILE: 'C:\\ProgramData',
  APPDATA: 'C:\\Users\\gekcho\\AppData\\Roaming',
  cmake: 'D:\\programfiles\\Cmake\\bin\\cmake.exe',
  CommonProgramFiles: 'C:\\Program Files\\Common Files',
  'CommonProgramFiles(x86)': 'C:\\Program Files (x86)\\Common Files',
  CommonProgramW6432: 'C:\\Program Files\\Common Files',
  COMPUTERNAME: 'gekchos_lappy',
  ComSpec: 'C:\\Windows\\system32\\cmd.exe',
  DriverData: 'C:\\Windows\\System32\\Drivers\\DriverData',
  GTK_BASEPATH: 'C:\\Program Files (x86)\\GtkSharp\\2.12\\',
  HADOOP_HOME:
   'C:\\Users\\gekcho\\Downloads\\Compressed\\hadoop-3.1.0\\hadoop-3.1.0\\bin',
  HOMEDRIVE: 'C:',
  HOMEPATH: '\\Users\\gekcho',
  JAVA_HOME: 'C:\\Java\\jdk1.8.0_201',
  LOCALAPPDATA: 'C:\\Users\\gekcho\\AppData\\Local',
  LOGONSERVER: '\\\\gekchos_lappy',
  MAGICK_HOME: 'C:\\wamp64\\bin\\php\\php7.3.1\\ext\\ImageMagick',
  NUMBER_OF_PROCESSORS: '4',
  OneDrive: 'C:\\Users\\gekcho\\OneDrive',
  OneDriveConsumer: 'C:\\Users\\gekcho\\OneDrive',
  OS: 'Windows_NT',
  Path:
   'C:\\wamp64\\bin\\php\\php7.3.1\\ext\\ImageMagick;
    C:\\Program Files (x86)\\Common Files\\Oracle\\Java\\javapath;
    C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;
    C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;
    C:\\Windows\\System32\\OpenSSH\\;D:\\programfiles\\Git\\cmd;
    D:\\programfiles\\Cmake\\bin;C:\\Program Files\\nodejs\\;
    C:\\Users\\gekcho\\Downloads\\Compressed\\hadoop-3.1.0\\hadoop-3.1.0\\bin;
    C:\\Java\\jdk1.8.0_201\\bin;
    C:\\Users\\gekcho\\Downloads\\Compressed\\spark-2.4.4-bin-hadoop2.7\\bin;
    C:\\Program Files (x86)\\GtkSharp\\2.12\\bin;
    C:\\Users\\gekcho\\AppData\\Local\\Microsoft\\WindowsApps;
    C:\\Users\\gekcho\\AppData\\Roaming\\npm',
  PATHEXT: '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC',
  PROCESSOR_ARCHITECTURE: 'AMD64',
  PROCESSOR_IDENTIFIER: 'Intel64 Family 6 Model 142 Stepping 9, GenuineIntel',
  PROCESSOR_LEVEL: '6',
  PROCESSOR_REVISION: '8e09',
  ProgramData: 'C:\\ProgramData',
  ProgramFiles: 'C:\\Program Files',
  'ProgramFiles(x86)': 'C:\\Program Files (x86)',
  ProgramW6432: 'C:\\Program Files',
  PROMPT: '$P$G',
  PSModulePath:
   'C:\\Program Files\\WindowsPowerShell\\Modules;
    C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\Modules',
  PUBLIC: 'C:\\Users\\Public',
  python3:
   'C:\\Users\\gekcho\\AppData\\Local\\Programs\\Python\\Python37-32\\python.exe',
  SESSIONNAME: 'Console',
  SPARK_HOME:
   'C:\\Users\\gekcho\\Downloads\\Compressed\\spark-2.4.4-bin-hadoop2.7',
  SystemDrive: 'C:',
  SystemRoot: 'C:\\Windows',
  TEMP: 'C:\\Users\\gekcho\\AppData\\Local\\Temp',
  TMP: 'C:\\Users\\gekcho\\AppData\\Local\\Temp',
  USERDOMAIN: 'gekchos_lappy',
  USERDOMAIN_ROAMINGPROFILE: 'gekchos_lappy',
  USERNAME: 'gekcho',
  USERPROFILE: 'C:\\Users\\gekcho',
  windir: 'C:\\Windows' }

Ejemplo2: 

javascript

// Node.js program to demonstrate the
// process.env Property
  
// Include process module
const process = require('process');
 
// Printing process.env property value
var no_env = 0;
 
// Calling process.env
var env = process.env;
 
// Iterating through all returned data
for (var key in env) {
     
    // Print value
    console.log(key + ":\t\t\t" + env[key]);
    no_env++;
}
 
// Printing count
console.log("total no of values available = "
            + no_env);
 
// Accessing one by one
console.log("operating system: " + env['OS']);
console.log("alluserprofile: " + env['ALLUSERSPROFILE']);
console.log("public directory: " + env['PUBLIC']);

Producción:

ALLUSERSPROFILE:        C:\ProgramData
APPDATA:                C:\Users\gekcho\AppData\Roaming
cmake:                  D:\programfiles\Cmake\bin\cmake.exe
CommonProgramFiles:     C:\Program Files\Common Files
CommonProgramFiles(x86):C:\Program Files (x86)\Common Files
CommonProgramW6432:     C:\Program Files\Common Files
COMPUTERNAME:           gekchos_lappy
ComSpec:                C:\Windows\system32\cmd.exe
DriverData:             C:\Windows\System32\Drivers\DriverData
GTK_BASEPATH:           C:\Program Files (x86)\GtkSharp\2.12\
HADOOP_HOME:            C:\Users\gekcho\Downloads\Compressed\hadoop-3.1.0\hadoop-3.1.0\bin
HOMEDRIVE:              C:
HOMEPATH:               \Users\gekcho
JAVA_HOME:              C:\Java\jdk1.8.0_201
LOCALAPPDATA:           C:\Users\gekcho\AppData\Local
LOGONSERVER:            \\gekchos_lappy
MAGICK_HOME:            C:\wamp64\bin\php\php7.3.1\ext\ImageMagick
NUMBER_OF_PROCESSORS:   4
OneDrive:               C:\Users\gekcho\OneDrive
OneDriveConsumer:       C:\Users\gekcho\OneDrive
OS:                     Windows_NT
Path:                   C:\wamp64\bin\php\php7.3.1\ext\ImageMagick;
C:\Program Files (x86)\Common Files\Oracle\Java\javapath;
C:\Windows\system32;C:\Windows;
C:\Windows\System32\Wbem;
C:\Windows\System32\WindowsPowerShell\v1.0\;
C:\Windows\System32\OpenSSH\;D:\programfiles\Git\cmd;
D:\programfiles\Cmake\bin;C:\Program Files\nodejs\;
C:\Users\gekcho\Downloads\Compressed\hadoop-3.1.0\hadoop-3.1.0\bin;
C:\Java\jdk1.8.0_201\bin;
C:\Users\gekcho\Downloads\Compressed\spark-2.4.4-bin-hadoop2.7\bin;
C:\Program Files (x86)\GtkSharp\2.12\bin;
C:\Users\gekcho\AppData\Local\Microsoft\WindowsApps;
C:\Users\gekcho\AppData\Roaming\npm
PATHEXT:               .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
PROCESSOR_ARCHITECTURE:AMD64
PROCESSOR_IDENTIFIER:  Intel64 Family 6 Model 142 Stepping 9, GenuineIntel
PROCESSOR_LEVEL:       6
PROCESSOR_REVISION:    8e09
ProgramData:           C:\ProgramData
ProgramFiles:          C:\Program Files
ProgramFiles(x86):     C:\Program Files (x86)
ProgramW6432:          C:\Program Files
PROMPT:                $P$G
PSModulePath:          C:\Program Files\WindowsPowerShell\Modules;
                       C:\Windows\system32\WindowsPowerShell\v1.0\Modules
PUBLIC:                C:\Users\Public
python3:               C:\Users\gekcho\AppData\Local\Programs\Python\Python37-32\python.exe
SESSIONNAME:           Console
SPARK_HOME:            C:\Users\gekcho\Downloads\Compressed\spark-2.4.4-bin-hadoop2.7
SystemDrive:           C:
SystemRoot:            C:\Windows
TEMP:                  C:\Users\gekcho\AppData\Local\Temp
TMP:                   C:\Users\gekcho\AppData\Local\Temp
USERDOMAIN:            gekchos_lappy
USERDOMAIN_ROAMINGPROFILE:gekchos_lappy
USERNAME:              gekcho
USERPROFILE:           C:\Users\gekcho
windir:                C:\Windows
total no of values available = 46
operating system: Windows_NT
alluserprofile: C:\ProgramData
public directory: C:\Users\Public

Ejemplo 3: 

javascript

// Node.js program to demonstrate the
// process.env Property
  
// Include process module
const process = require('process');
 
// Printing process.env property value
var env = process.env;
  
console.log("operating system: " + env.OS);
console.log("alluserprofile: " + env.ALLUSERSPROFILE);
console.log("public directory: " + env.PUBLIC);
 
// Setting new data
env.gekcho = "gekcho custom data";
console.log("stored in env.gekcho: " + env.gekcho);
  
// Delete data
delete env.gekcho
console.log("stored in env.gekcho: " + env.gekcho);

Producción:

operating system: Windows_NT
alluserprofile: C:\ProgramData
public directory: C:\Users\Public
stored in env.gekcho: gekcho custom data
stored in env.gekcho: undefined

Nota: El programa anterior se compilará y ejecutará utilizando el comando node filename.js. Referencia: https://nodejs.org/api/process.html#process_process_env

Publicación traducida automáticamente

Artículo escrito por vyer y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA

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