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duplexer

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duplexer

Creates a duplex stream

  • 0.1.2
  • latest
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  • npm
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14M
decreased by-15.74%
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What is duplexer?

The `duplexer` npm package is a utility for creating a duplex (readable and writable) stream from two separate streams: a writable stream for writing to and a readable stream for reading from. This is particularly useful in scenarios where you need to treat two separate streams as a single duplex stream for piping data through a series of transformations or operations.

What are duplexer's main functionalities?

Creating a duplex stream from a writable and readable stream

This code demonstrates how to create a duplex stream using `duplexer` by combining a writable stream, which logs data it receives, and a readable stream, which emits a single piece of data. The resulting duplex stream can be used to read data emitted by the readable stream and write data to the writable stream.

const {Writable, Readable} = require('stream');
const duplexer = require('duplexer');

const writable = new Writable({
  write(chunk, encoding, callback) {
    console.log(`Writing: ${chunk.toString()}`);
    callback();
  }
});

const readable = new Readable({
  read(size) {
    this.push('Read data');
    this.push(null); // No more data
  }
});

const duplex = duplexer(writable, readable);
duplex.on('data', (data) => console.log(`Read from duplex: ${data.toString()}`));
duplex.write('Data to write');

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Package last updated on 12 Aug 2020

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