Node.js Process

Node.js Process Object

In Node.js, the process object is a powerful global utility that gives access to information about the running application ÔÇö process ID, architecture, platform, Node.js version, uptime, memory usage, and more. It can also perform actions like killing a process and handling signals. Since it is global and an instance of EventEmitter, it can be accessed anywhere.

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Common process Properties

• arch ÔÇö processor architecture (arm, ia32, x64)
• argv ÔÇö command-line arguments array
• env ÔÇö environment variables
• pid ÔÇö process ID
• platform ÔÇö darwin, linux, win32, etc.
• version / versions ÔÇö Node.js and dependency versions

Example 1: Basic Process Properties

// process_example1.js
console.log(`Architecture: ${process.arch}`);
console.log(`PID: ${process.pid}`);
console.log(`Platform: ${process.platform}`);
console.log(`Version: ${process.version}`);

Example 2: Command-Line Arguments

// process_example2.js
process.argv.forEach((value, index) => {
  console.log(`${index}: ${value}`);
});

Node.js itself is the first argument, the file name is the second, and extra arguments follow.

Useful process Functions

• cwd() ÔÇö current working directory
• hrtime() ÔÇö high-resolution time [seconds, nanoseconds]
• memoryUsage() ÔÇö memory usage details
• kill(pid[, signal]) ÔÇö kill a process by PID
• uptime() ÔÇö process uptime in seconds

// process_example3.js
console.log(`Current directory: ${process.cwd()}`);
console.log(`Uptime: ${process.uptime()} seconds`);

Handling Process Events

process.on('exit', (code) => {
  console.log(`Process exiting with code: ${code}`);
});

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Conclusion

The process object is essential for accessing runtime information and controlling the application lifecycle in Node.js. From reading arguments to handling exit events, it is a core tool every Node developer should know. For more tutorials, stay connected with .

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