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What are “streams” in Node.js?

 What are “streams” in Node.js? Explain the different types of streams present in Node.js.


Asked On2019-06-17 13:27:04 by:gokilapriya

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Node.js streams have a reputation for being hard to work with, and even harder to understand. Well I’ve got good news for you — that’s no longer the case.

Over the years, developers created lots of packages out there with the sole purpose of making working with streams easier. But in this article, I’m going to focus on the native Node.js stream API.
What exactly are streams?
Streams are collections of data — just like arrays or strings. The difference is that streams might not be available all at once, and they don’t have to fit in memory. This makes streams really powerful when working with large amounts of data, or data that’s coming from an external source one chunk at a time.

However, streams are not only about working with big data. They also give us the power of composability in our code. Just like we can compose powerful linux commands by piping other smaller Linux commands, we can do exactly the same in Node with streams.


Answerd on:2019-07-02 Answerd By:avi738

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There are four fundamental stream types within Node.js:
  • Writable - streams to which data can be written (for example, fs.createWriteStream() ).
  • Readable - streams from which data can be read (for example, fs.createReadStream() ).
  • Duplex - streams that are both Readable and Writable (for example, net.Socket ).

Answerd on:2019-08-27 Answerd By:Annaliya

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A stream is an abstract interface for working with streaming data in Node.js. The stream module provides a base API that makes it easy to build objects that implement the stream interface.

There are many stream objects provided by Node.js. For instance, a request to an HTTP server and process.stdout are both stream instances.

Streams can be readable, writable, or both. All streams are instances of EventEmitter.

The stream module can be accessed using:

const stream = require('stream');
While it is important to understand how streams work, the stream module itself is most useful for developers that are creating new types of stream instances. Developers who are primarily consuming stream objects will rarely need to use the stream module directly.

Organization of this Document#
This document is divided into two primary sections with a third section for additional notes. The first section explains the elements of the stream API that are required to use streams within an application. The second section explains the elements of the API that are required to implement new types of streams.

Types of Streams#
There are four fundamental stream types within Node.js:

Writable - streams to which data can be written (for example, fs.createWriteStream()).
Readable - streams from which data can be read (for example, fs.createReadStream()).
Duplex - streams that are both Readable and Writable (for example, net.Socket).
Transform - Duplex streams that can modify or transform the data as it is written and read (for example, zlib.createDeflate()).
Additionally, this module includes the utility functions pipeline, finished and Readable.from.

Answerd on:2019-07-03 Answerd By:avi738

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Streams are objects that allows developers to read/write data to and from a source in a continuous manner. There are four main types of streams in Node.js; readable, writable, duplex and transform. Each stream is an eventEmitter instance that emits different events at several intervals.

Answerd on:2021-12-27 Answerd By:Akhil-Dev-D

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