Node.js os module All In One

Node.js os module All In One

Node.js v12.4.0

Node.js os Module

// ESM
import os from 'node:os';
// ❓what is the difference
import os from 'os'

// CJS
const os = require('node:os');

https://nodejs.org/api/os.html

demos

ESM .mjs / package.json "type": "module" + .js

import os from 'node:os'
// const os = require('node:os');

// console.log(`os =`, os)
// console.log(`os.arch =`, os.arch)
/* os.arch = [Function: arch] {
  [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
} */
console.log(`os.arch() =`, os.arch())
// console.log(`os.cpus() =`, os.cpus())
console.log(`os.cpus().length =`, os.cpus().length)
console.log(`os.cpus()[0] =`, os.cpus()[0])
console.log(`os.hostname() =`, os.hostname())
console.log(`os.platform() =`, os.platform())
console.log(`os.userInfo() =`, os.userInfo())
console.log(`os.version() =`, os.version())
// console.log(`os =`, os)

/*

os = {
  arch: [Function: arch] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  cpus: [Function: cpus],
  endianness: [Function: endianness] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  freemem: [Function: getFreeMem] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  getPriority: [Function: getPriority],
  homedir: [Function: __node_internal_checkError] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  hostname: [Function: __node_internal_checkError] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  loadavg: [Function: loadavg],
  networkInterfaces: [Function: networkInterfaces],
  platform: [Function: platform] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  release: [Function: getOSRelease] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  setPriority: [Function: setPriority],
  tmpdir: [Function: tmpdir] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  totalmem: [Function: getTotalMem] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  type: [Function: getOSType] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  userInfo: [Function: userInfo],
  uptime: [Function: getUptime] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  version: [Function: getOSVersion] {
    [Symbol(Symbol.toPrimitive)]: [Function (anonymous)]
  },
  constants: [Object: null prototype] {
    UV_UDP_REUSEADDR: 4,
    dlopen: [Object: null prototype] {
      RTLD_LAZY: 1,
      RTLD_NOW: 2,
      RTLD_GLOBAL: 8,
      RTLD_LOCAL: 4
    },
    errno: [Object: null prototype] {
      E2BIG: 7,
      EACCES: 13,
      EADDRINUSE: 48,
      EADDRNOTAVAIL: 49,
      EAFNOSUPPORT: 47,
      EAGAIN: 35,
      EALREADY: 37,
      EBADF: 9,
      EBADMSG: 94,
      EBUSY: 16,
      ECANCELED: 89,
      ECHILD: 10,
      ECONNABORTED: 53,
      ECONNREFUSED: 61,
      ECONNRESET: 54,
      EDEADLK: 11,
      EDESTADDRREQ: 39,
      EDOM: 33,
      EDQUOT: 69,
      EEXIST: 17,
      EFAULT: 14,
      EFBIG: 27,
      EHOSTUNREACH: 65,
      EIDRM: 90,
      EILSEQ: 92,
      EINPROGRESS: 36,
      EINTR: 4,
      EINVAL: 22,
      EIO: 5,
      EISCONN: 56,
      EISDIR: 21,
      ELOOP: 62,
      EMFILE: 24,
      EMLINK: 31,
      EMSGSIZE: 40,
      EMULTIHOP: 95,
      ENAMETOOLONG: 63,
      ENETDOWN: 50,
      ENETRESET: 52,
      ENETUNREACH: 51,
      ENFILE: 23,
      ENOBUFS: 55,
      ENODATA: 96,
      ENODEV: 19,
      ENOENT: 2,
      ENOEXEC: 8,
      ENOLCK: 77,
      ENOLINK: 97,
      ENOMEM: 12,
      ENOMSG: 91,
      ENOPROTOOPT: 42,
      ENOSPC: 28,
      ENOSR: 98,
      ENOSTR: 99,
      ENOSYS: 78,
      ENOTCONN: 57,
      ENOTDIR: 20,
      ENOTEMPTY: 66,
      ENOTSOCK: 38,
      ENOTSUP: 45,
      ENOTTY: 25,
      ENXIO: 6,
      EOPNOTSUPP: 102,
      EOVERFLOW: 84,
      EPERM: 1,
      EPIPE: 32,
      EPROTO: 100,
      EPROTONOSUPPORT: 43,
      EPROTOTYPE: 41,
      ERANGE: 34,
      EROFS: 30,
      ESPIPE: 29,
      ESRCH: 3,
      ESTALE: 70,
      ETIME: 101,
      ETIMEDOUT: 60,
      ETXTBSY: 26,
      EWOULDBLOCK: 35,
      EXDEV: 18
    },
    signals: [Object: null prototype] {
      SIGHUP: 1,
      SIGINT: 2,
      SIGQUIT: 3,
      SIGILL: 4,
      SIGTRAP: 5,
      SIGABRT: 6,
      SIGIOT: 6,
      SIGBUS: 10,
      SIGFPE: 8,
      SIGKILL: 9,
      SIGUSR1: 30,
      SIGSEGV: 11,
      SIGUSR2: 31,
      SIGPIPE: 13,
      SIGALRM: 14,
      SIGTERM: 15,
      SIGCHLD: 20,
      SIGCONT: 19,
      SIGSTOP: 17,
      SIGTSTP: 18,
      SIGTTIN: 21,
      SIGTTOU: 22,
      SIGURG: 16,
      SIGXCPU: 24,
      SIGXFSZ: 25,
      SIGVTALRM: 26,
      SIGPROF: 27,
      SIGWINCH: 28,
      SIGIO: 23,
      SIGINFO: 29,
      SIGSYS: 12
    },
    priority: [Object: null prototype] {
      PRIORITY_LOW: 19,
      PRIORITY_BELOW_NORMAL: 10,
      PRIORITY_NORMAL: 0,
      PRIORITY_ABOVE_NORMAL: -7,
      PRIORITY_HIGH: -14,
      PRIORITY_HIGHEST: -20
    }
  },
  EOL: '\n',
  devNull: '/dev/null'
}


*/

macOS Intel CPUs

Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz

$ node ./os-module.mjs
os.arch() = x64
os.cpus().length = 12
os.cpus()[0] = {
  model: 'Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz',
  speed: 2200,
  times: { user: 3276490, nice: 0, sys: 2014940, idle: 30180650, irq: 0 }
}
os.hostname() = xgqfrms-mbp.local
os.platform() = darwin
os.userInfo() = {
  uid: 501,
  gid: 20,
  username: 'xgqfrms-mbp',
  homedir: '/Users/xgqfrms-mbp',
  shell: '/bin/zsh'
}
os.version() = Darwin Kernel Version 21.4.0: Mon Feb 21 20:34:37 PST 2022; root:xnu-8020.101.4~2/RELEASE_X86_64

CJS .js

// import os from 'node:os'
const os = require('node:os');

// console.log(`os =`, os)
// console.log(`os.arch =`, os.arch)
console.log(`os.arch() =`, os.arch())
console.log(`os.cpus() =`, os.cpus())
console.log(`os.cpus().length =`, os.cpus().length)
console.log(`os.cpus()[0] =`, os.cpus()[0])
console.log(`os.hostname() =`, os.hostname())
console.log(`os.platform() =`, os.platform())
console.log(`os.userInfo() =`, os.userInfo())
console.log(`os.version() =`, os.version())

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