Node.js Operating System Module
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OS
The node:os module provides operating system-related utility methods and properties.
OS
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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