Node.js OS (original) (raw)

Last Updated : 17 Jan, 2026

The os module provides access to operating system information such as hostname, CPU details, and memory usage, including free system memory in bytes.

**os.arch(): Returns the CPU architecture (e.g., x64, arm).
**os.cpus(): Returns an array with details of each CPU/core.
**os.freemem(): Returns free system memory in bytes.
**os.homedir(): Returns the current user’s home directory path.
**os.hostname(): Returns the system hostname.
**os.networkInterfaces(): Returns network interface information.
**os.platform(): Returns the operating system platform (e.g., linux, darwin).
**os.release(): Returns the operating system release version.
**os.totalmem(): Returns total system memory in bytes.
**os.uptime(): Returns system uptime in seconds.

Features

The os module offers utilities to inspect system details, monitor resources, and detect the operating system platform.

**System Information: Provides insights into the system’s hardware and software environment.
**Resource Monitoring: Helps in monitoring memory usage and system performance.
**Platform Detection: Identifies the platform and version of the operating system.

**Example: Uses Node.js os module to fetch and display system details and memory info.

JavaScript `

// Include os module and create its object const os = require('os');

// return the cpu architecture console.log("CPU architecture: " + os.arch());

// It returns the amount of free system memory in bytes console.log("Free memory: " + os.freemem());

// It return total amount of system memory in bytes console.log("Total memory: " + os.totalmem());

// It returns the list of network interfaces console.log('List of network Interfaces: ' + os.networkInterfaces());

// It returns the operating systems default directory for temp files. console.log('OS default directory for temp files : ' + os.tmpdir());

**Output:

**Example: Displays system endianness, hostname, OS name, platform, and release using the Node.js os module.

JavaScript `

// Include os module and create its object const os = require('os');

// return the endianness of system console.log("Endianness of system: " + os.endianness());

// It returns hostname of system console.log("Hostname: " + os.hostname());

// It return operating system name console.log("Operating system name: " + os.type());

// It returns the platform of os console.log('operating system platform: ' + os.platform());

// It returns the operating systems release. console.log('OS release : ' + os.release());

**Output:

**Enhanced Functionality: Facilitates writing system-specific code.
**Performance: Allows monitoring and optimizing system resource usage.
**Cross-Platform Support: Ensures compatibility across different operating systems.