Node.js Operating System Module

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The node:os module provides operating system-related utility methods and properties.

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os.EOL

<string> The operating system-specific end-of-line marker.

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os.availableParallelism()

This function is a small wrapper about libuv's uv_available_parallelism().

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os.arch()

The return value is equivalent to process.arch.

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os.constants

<Object> Contains commonly used operating system-specific constants for error codes, process signals, and so on.

The specific constants defined are described in OS constants.

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os.cpus()

Returns an array of objects containing information about each logical CPU core.

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os.devNull

<string> The platform-specific file path of the null device.

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os.endianness()

Returns: <string> Returns a string identifying the endianness of the CPU for which the Node.js binary was compiled. Possible values are 'BE' for big endian and 'LE' for little endian.

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os.freemem()

Returns: <integer> Returns the amount of free system memory in bytes as an integer.

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os.getPriority([pid])

Returns the scheduling priority for the process specified by pid.

If pid is not provided or is 0, the priority of the current process is returned.

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os.homedir()

Returns: <string> Returns the string path of the current user's home directory. On POSIX, it uses the $HOME environment variable if defined. Otherwise it uses the effective UID to look up the user's home directory.

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os.hostname()

Returns: <string> Returns the host name of the operating system as a string.

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os.loadavg()

Returns: <number[]> Returns an array containing the 1, 5, and 15 minute load averages. The load average is a measure of system activity calculated by the operating system and expressed as a fractional number.

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os.machine()

Returns: <string> Returns the machine type as a string, such as arm, arm64, aarch64, mips, mips64, ppc64, ppc64le, s390, s390x, i386, i686, x86_64.

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os.networkInterfaces()

Returns: <Object> Returns an object containing network interfaces that have been assigned a network address. Each key on the returned object identifies a network interface. The associated value is an array of objects that each describe an assigned network address. eslint-skip

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os.platform()

Returns: <string> Returns a string identifying the operating system platform for which the Node.js binary was compiled. The value is set at compile time. Possible values are 'aix', 'darwin', 'freebsd','linux', 'openbsd', 'sunos', and 'win32'.

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os.release()

Returns: <string> Returns the operating system as a string. On POSIX systems, the operating system release is determined by calling uname(3). On Windows, GetVersionExW() is used. See https://en.wikipedia.org/wiki/Uname#Examples for more information.

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os.setPriority([pid, ]priority)

pid <integer> The process ID to set scheduling priority for. Default: 0. priority <integer> The scheduling priority to assign to the process.

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os.tmpdir()

Returns: <string> Returns the operating system's default directory for temporary files as a string.

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os.totalmem()

Returns: <integer> Returns the total amount of system memory in bytes as an integer.

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os.type()

Returns: <string> Returns the operating system name as returned by uname(3). For example, it returns 'Linux' on Linux, 'Darwin' on macOS, and 'Windows_NT' on Windows.

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os.uptime()

Returns: <integer> Returns the system uptime in number of seconds.

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os.userInfo([options])

options <Object> encoding <string> Character encoding used to interpret resulting strings. If encoding is set to 'buffer', the username, shell, and homedir values will be Buffer instances. Default: 'utf8'.

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os.version()

Returns: <string> Returns a string identifying the kernel version.

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OS constants

The following constants are exported by os.constants. Not all constants will be available on every operating system.

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Signal constants

History Version Changes v5.11.0 Added support for SIGINFO. The following signal constants are exported by os.constants.signals. Constant Description

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Error constants

The following error constants are exported by os.constants.errno.

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POSIX error constants

Constant Description

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Windows-specific error constants

The following error codes are specific to the Windows operating system. Constant Description

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dlopen constants

If available on the operating system, the following constants are exported in os.constants.dlopen. See dlopen(3) for detailed information. Constant Description

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Priority constants

The following process scheduling constants are exported by os.constants.priority. Constant Description

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libuv constants

Constant Description

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