Need help with multistream?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

239 Stars 27 Forks MIT License 139 Commits 1 Opened issues


A stream that emits multiple other streams one after another (streams3)

Services available


Need anything else?

Contributors list

multistream travis npm downloads javascript style guide

A stream that emits multiple other streams one after another (streams3)

Sauce Test Status


Simple, robust streams3 version of combined-stream. Allows you to combine multiple streams into a single stream. When the first stream ends, the next one starts, and so on, until all streams are consumed.

This module is used by WebTorrent, specifically create-torrent.


npm install multistream



like this:
var MultiStream = require('multistream')
var fs = require('fs')

var streams = [ fs.createReadStream(__dirname + '/numbers/1.txt'), fs.createReadStream(__dirname + '/numbers/2.txt'), fs.createReadStream(__dirname + '/numbers/3.txt') ]

new MultiStream(streams).pipe(process.stdout) // => 123

You can also create an object-mode stream with


To lazily create the streams, wrap them in a function:

var streams = [
  fs.createReadStream(__dirname + '/numbers/1.txt'),
  function () { // will be executed when the stream is active
    return fs.createReadStream(__dirname + '/numbers/2.txt')
  function () { // same
    return fs.createReadStream(__dirname + '/numbers/3.txt')

new MultiStream(streams).pipe(process.stdout) // => 123

Alternatively, streams may be created by an asynchronous "factory" function:

var count = 0
function factory (cb) {
  if (count > 3) return cb(null, null)
  setTimeout(function () {
    cb(null, fs.createReadStream(__dirname + '/numbers/' + count + '.txt'))
  }, 100)

new MultiStream(factory).pipe(process.stdout) // => 123



MIT. Copyright (c) Feross Aboukhadijeh.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.