@stdlib/streams-node-stdin

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Standard Input

Standard input.

Installation

npm install @stdlib/streams-node-stdin

Usage

var stdin = require( '@stdlib/streams-node-stdin' );

stdin

Standard input as a Readable stream.

var string2buffer = require( '@stdlib/buffer-from-string' );
var Buffer = require( '@stdlib/buffer-ctor' );

var data = [];
var len = 0;

stdin.on( 'readable', onReadable );
stdin.on( 'error', onError );
stdin.on( 'end', onEnd );

function onReadable() {
    var chunk;
    while ( true ) {
        chunk = stdin.read();
        if ( chunk === null ) {
            break;
        }
        if ( typeof chunk === 'string' ) {
            chunk = string2buffer( chunk );
        }
        data.push( chunk );
        len += chunk.length;
    }
}

function onError( error ) {
    if ( error ) {
        console.error( error.message );
    }
}

function onEnd() {
    data = Buffer.concat( data, len );
    console.log( data.toString() );
    // => '...'
}

Examples

var proc = require( 'process' );
var stdin = require( '@stdlib/streams-node-stdin' );
var stdout = require( '@stdlib/streams-node-stdout' );

// Set the encoding:
stdin.setEncoding( 'utf8' );

// Create an echo stream:
stdin.pipe( stdout );

// Push data to `stdin`:
stdin.push( 'beep' );
stdin.push( ' ' );
stdin.push( 'boop' );
stdin.push( '\n' );

// End the stream:
stdin.push( null );

// Ensure the process closes:
setTimeout( proc.exit, 1000 );

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.

Similar packages

Other packages similar to @stdlib/streams-node-stdin

readline

The 'readline' module in Node.js provides an interface for reading data from a Readable stream (such as process.stdin) one line at a time. It is part of the Node.js standard library and offers similar functionality to @stdlib/streams-node-stdin for line-by-line input processing.

get-stdin

The 'get-stdin' package is a simple utility for getting stdin as a string or buffer. It is similar to @stdlib/streams-node-stdin's functionality for reading the entire stdin input at once.

split

The 'split' package is a transform stream that splits data on a delimiter, such as a newline character. It can be used to process stdin line-by-line, similar to the lineStream feature of @stdlib/streams-node-stdin.