os.platform and os.arch in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does os.platform() return in Node.js?

os.platform() returns a string identifying the operating system platform on which the Node.js process is running, such as 'win32', 'linux', or 'darwin'.

beginner

What information does os.arch() provide in Node.js?

os.arch() returns a string that describes the CPU architecture of the Node.js process, like 'x64', 'arm', or 'ia32'.

intermediate

Why is it useful to know the platform and architecture in a Node.js app?

Knowing the platform and architecture helps your app run the right code or load the correct files for the user's system, like choosing compatible binaries or handling OS-specific features.

beginner

Example: What will console.log(os.platform()) output on a Mac computer?

It will output 'darwin', which is the platform name Node.js uses for macOS.

intermediate

How can you use os.arch() to check if your Node.js app is running on a 64-bit system?

You can check if os.arch() returns 'x64', which means the system is 64-bit.

What does os.platform() return in Node.js?

A The current working directory

B The operating system platform name

C The Node.js version

D The CPU architecture

os.platform() returns the OS platform like 'win32' or 'linux'.

Which of these is a possible output of os.arch()?

A x64

B linux

C darwin

D node

os.arch() returns CPU architecture such as 'x64'.

If os.platform() returns 'win32', what does it mean?

A The app runs on macOS

B The app runs on Linux OS

C The app runs on Windows OS

D The app runs on Android

'win32' means Windows OS platform.

Why might a Node.js app check os.arch()?

A To decide which CPU-specific code or binaries to use

B To get the user's IP address

C To find the Node.js version

D To read environment variables

CPU architecture helps select compatible code or binaries.

Which Node.js module provides platform() and arch() methods?

A fs

B path

C http

D os

The os module provides these methods.

Explain what os.platform() and os.arch() do in Node.js and why they are useful.

Think about how your app might behave differently on Windows vs Mac or 32-bit vs 64-bit.

Describe a scenario where checking os.arch() would help your Node.js application.

Imagine your app needs to run a native addon or external program.