node.js
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In this complete Node.js tutorial for 2025, you’ll learn how to take input from the command line in Node.js using the built-in readline module and other efficient techniques. Accepting user input is an essential skill for building interactive CLI (Command-Line Interface) applications, automation scripts, and backend tools in Node.js.
We will explore multiple methods to capture input from the terminal, including:
Using the readline module for step-by-step user input
Reading input synchronously and asynchronously
Accepting multiple inputs in a single session
Handling input events and validating user responses
Using third-party packages like prompt-sync and inquirer for advanced CLI features
Passing arguments via process.argv for quick, non-interactive input
Best practices for parsing and validating input in Node.js
Examples of real-world CLI tools and automation scripts using input data
You’ll also learn how the Node.js event loop works when taking user input, ensuring your program remains responsive. We’ll walk through practical examples such as:
✅ Asking the user for their name and printing a greeting
✅ Building a basic calculator that takes input from the terminal
✅ Creating a file using user-provided input
✅ Passing and reading command-line arguments for automation scripts
What you’ll master in this tutorial:
How readline.createInterface() works
Listening for the 'line' event to process user input in real time
Closing the readline interface properly to prevent
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2025/08/11
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