Node.js Process

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Node.js Process

In Node.js, the process object is a powerful global utility that helps developers access essential information about the running application. It provides details such as process ID, architecture, platform, Node.js version, uptime, memory usage, and more. Beyond information, the process object can also perform actions like killing a process, setting user IDs, and handling signals.

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Since process is a global object and an instance of EventEmitter, it can be accessed from anywhere in a Node.js application.

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Node.js Process Properties

Below are some of the commonly used properties of the process object:

Property Description
arch Returns the processor architecture: 'arm', 'ia32', or 'x64'.
argv Returns command-line arguments as an array.
env Provides user environment information.
pid Returns the process ID of the running process.
platform Returns the platform: 'darwin', 'freebsd', 'linux', 'sunos', or 'win32'.
release Returns metadata about the current Node.js release.
version Returns the Node.js version.
versions Returns Node.js version and its dependencies.

Example 1: Basic Process Properties

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File: process_example1.js

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

Run in terminal:

node process_example1.js

Example 2: Command-Line Arguments

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File: process_example2.js

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

Run in terminal:

node process_example2.js

Here, Node.js itself is the first argument, the file name is the second, and any extra arguments are listed after that.

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Node.js Process Functions

Apart from properties, process also provides useful functions:

Function Description
cwd() Returns the current working directory path.
hrtime() Returns high-resolution real time as [seconds, nanoseconds].
memoryUsage() Provides an object with memory usage details.
process.kill(pid[, signal]) Kills a given process by its PID.
uptime() Returns the uptime of the Node.js process in seconds.

Example 3: Current Directory & Uptime

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File: process_example3.js

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

Run in terminal:

node process_example3.js

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