Usage in Deno
import * as mod from "node:readline";
The node:readline module provides an interface for reading data from a Readable stream
(such as process.stdin) one line at a time.
To use the promise-based APIs:
import * as readline from 'node:readline/promises';
To use the callback and sync APIs:
import * as readline from 'node:readline';
The following simple example illustrates the basic use of the node:readline module.
import * as readline from 'node:readline/promises'; import { stdin as input, stdout as output } from 'node:process'; const rl = readline.createInterface({ input, output }); const answer = await rl.question('What do you think of Node.js? '); console.log(`Thank you for your valuable feedback: ${answer}`); rl.close();
Once this code is invoked, the Node.js application will not terminate until the readline.Interface is closed because the interface waits for data to be
received on the input stream.
Instances of the readline.Interface class are constructed using the readline.createInterface() method. Every instance is associated with asingle input Readable stream and a single output Writable stream.The output stream is used to print prompts for user input that arrives on,and is read from, the input stream.
Instances of the readlinePromises.Interface class are constructed using the readlinePromises.createInterface() method. Every instance is associated with asingle input Readable stream and a single output Writable stream.The output stream is used to print prompts for user input that arrives on,and is read from, the input stream.
The readline.clearScreenDown() method clears the given TTY stream fromthe current position of the cursor down.
The readline.createInterface() method creates a new readline.Interface instance.
The readline.emitKeypressEvents() method causes the given Readable stream to begin emitting 'keypress' events corresponding to received input.
The readline.moveCursor() method moves the cursor relative to its currentposition in a given TTY stream.
The readlinePromises.createInterface() method creates a new readlinePromises.Interface instance.