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stream

Node.js streams in the browser

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What is stream?

The 'stream' package in Node.js provides a way to handle streaming data. Streams are objects that let you read data from a source or write data to a destination in a continuous fashion. They are particularly useful for handling large amounts of data, such as reading files or handling HTTP requests and responses.

What are stream's main functionalities?

Readable Stream

A Readable stream is used to read data from a source. In this example, a custom Readable stream is created that pushes 'Hello, World!' and then signals the end of data.

const { Readable } = require('stream');

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

readable.on('data', (chunk) => {
  console.log(`Received ${chunk.length} bytes of data.`);
});

readable.on('end', () => {
  console.log('No more data.');
});

Writable Stream

A Writable stream is used to write data to a destination. In this example, a custom Writable stream is created that logs the data it receives.

const { Writable } = require('stream');

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

writable.write('Hello, World!');
writable.end('Goodbye, World!');

Transform Stream

A Transform stream is a type of duplex stream where the output is computed based on the input. In this example, a custom Transform stream is created that converts input data to uppercase.

const { Transform } = require('stream');

const transform = new Transform({
  transform(chunk, encoding, callback) {
    this.push(chunk.toString().toUpperCase());
    callback();
  }
});

transform.on('data', (chunk) => {
  console.log(`Transformed: ${chunk.toString()}`);
});

transform.write('Hello, World!');
transform.end('Goodbye, World!');

Duplex Stream

A Duplex stream is both Readable and Writable. In this example, a custom Duplex stream is created that reads and writes data.

const { Duplex } = require('stream');

const duplex = new Duplex({
  read(size) {
    this.push('Hello, World!');
    this.push(null); // No more data
  },
  write(chunk, encoding, callback) {
    console.log(`Writing: ${chunk.toString()}`);
    callback();
  }
});

duplex.on('data', (chunk) => {
  console.log(`Received ${chunk.length} bytes of data.`);
});

duplex.write('Hello, World!');
duplex.end('Goodbye, World!');

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Package last updated on 26 Jun 2024

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