Converting Uint8Array into Stream with Node JS

Question

What's the best way to take a native JavaScript Uint8Array and turn it into a readable or transform Stream?

I figured out how to turn Uint8Array's into Buffers, not sure if this helps:

var uint8array = new Uint8Array();
var buffer = new Buffer(uint8array);

Ben · Accepted Answer · 2015-08-25 02:23:00Z

3

The standard way would be to define a readable stream with a _read method:

var Stream = require('stream');

var myStream = new Stream.Readable();
var i = 0;
var data = [1, 2, 3, 4];

myStream._read = function(size) {
  var pushed = true;
  while (pushed && i < data.length) {
    pushed = this.push(data[i++]);
  }

  if (i === data.length) {
    this.push(null);
  }
};

myStream.pipe(somewhere);

However, you can also use event-stream's readArray method:

var es = require('event-stream');
var data = [1, 2, 3, 4];
var myStream = es.readArray(data);

myStream.pipe(somewhere);

answered Aug 25, 2015 at 2:23

Ben

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1 Comment

Doug Over a year ago

Trying the "Standard Way" I get an error: "TypeError: Invalid non-string/buffer chunk". I'm piping it to process.stdout as a test. Am I doing something wrong, or is this broken?

suda · Accepted Answer · 2017-06-23 14:33:51Z

3

What made it work for me was using Duplex instead of Readable (credit goes to Brian Mancini ):

import { Duplex } from 'stream';
// Or non ES6 syntax:
// const Duplex = require('stream').Duplex
let stream = new Duplex();
stream.push(buffer);
stream.push(null);
stream.pipe(process.stdout);

answered Jun 23, 2017 at 14:33

suda

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