Node.js TTY Module

Node.js TTY Module

The Node.js TTY (Teletype) module controls terminal-based input and output. It exposes two classes ÔÇö tty.ReadStream and tty.WriteStream ÔÇö useful for building CLI applications and interactive terminal tools.

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Accessing the TTY Module

const tty = require('tty');

When Node.js runs inside a TTY, process.stdin becomes a tty.ReadStream and process.stdout becomes a tty.WriteStream automatically.

Check if You Are in a TTY

node -p -e "Boolean(process.stdout.isTTY)"
// true if connected to a terminal

ReadStream and Raw Mode

process.stdin.setRawMode(true);  // read byte-by-byte
process.stdin.resume();

Raw mode is essential for capturing single keypresses without waiting for Enter.

WriteStream and Resize Events

process.stdout.on('resize', () => {
  console.log('Terminal resized!');
  console.log(`${process.stdout.columns} x ${process.stdout.rows}`);
});

Useful Properties

• process.stdout.columns ÔÇö current width.
• process.stdout.rows ÔÇö current height.
• process.stdin.isTTY ÔÇö true if interactive.
• process.stdin.setRawMode(true) ÔÇö enable raw mode.

Example: Detect Ctrl+C

process.stdin.setRawMode(true);
process.stdin.resume();
console.log('Press Ctrl+C to exit');

process.stdin.on('keypress', (char, key) => {
  if (key && key.ctrl && key.name === 'c') process.exit();
});

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Conclusion

The TTY module lets you build rich interactive CLI tools ÔÇö capture keypresses, react to terminal resizes, and control output formatting. For more tutorials, stay tuned to .

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