Understanding gzip-size: Compress Your Files Efficiently

When it comes to improving web performance, file compression is a crucial step. One of the most efficient ways to compress files is by using gzip. The gzip-size library in JavaScript can help you determine the size of your files after gzip compression. In this article, we will explore various APIs provided by gzip-size and demonstrate their usage with code snippets.

Introduction to gzip-size

The gzip-size package allows you to get the gzipped size of a string or buffer. It can be used in node.js environment and provides synchronous and asynchronous methods to retrieve the gzip size. Let’s dive into its API and see how they can be used.

Installing gzip-size

  npm install gzip-size

API Methods

gzipSize.sync(buffer)

This method returns the size of the buffer after gzip compression synchronously.

  const gzipSize = require('gzip-size');
  const buffer = Buffer.from('Hello, world!');
  console.log(gzipSize.sync(buffer)); // Outputs the size in bytes

gzipSize(buffer)

This method returns a Promise that resolves with the size of the buffer after gzip compression.

  const gzipSize = require('gzip-size');
  const buffer = Buffer.from('Hello, world!');
  gzipSize(buffer).then(size => {
      console.log(size); // Outputs the size in bytes
  });

gzipSize.fileSync(path)

This method returns the size of the file at the provided path after gzip compression synchronously.

  const gzipSize = require('gzip-size');
  console.log(gzipSize.fileSync('path/to/file.txt')); // Outputs the size in bytes

gzipSize.file(path)

This method returns a Promise that resolves with the size of the file at the provided path after gzip compression.

  const gzipSize = require('gzip-size');
  gzipSize.file('path/to/file.txt').then(size => {
      console.log(size); // Outputs the size in bytes
  });

gzipSize.stream()

This method returns a transform stream that compresses the data using gzip and measures its size.

  const fs = require('fs');
  const gzipSize = require('gzip-size');
  const stream = fs.createReadStream('path/to/file.txt')
    .pipe(gzipSize.stream())
    .on('gzip-size', size => {
      console.log(`The gzipped size is: ${size} bytes`);
    });

Application Example

Let’s take a look at a complete example application that combines these APIs to read a file, compress it, and log the compressed size.

  const fs = require('fs');
  const gzipSize = require('gzip-size');

  const filePath = 'path/to/file.txt';

  // Read the file
  fs.readFile(filePath, (err, buffer) => {
    if (err) {
      throw err;
    }

    // Get gzip size synchronously
    const syncSize = gzipSize.sync(buffer);
    console.log(`Synchronous gzip size: ${syncSize} bytes`);

    // Get gzip size asynchronously
    gzipSize(buffer).then(asyncSize => {
      console.log(`Asynchronous gzip size: ${asyncSize} bytes`);
    });

    // Get gzip size of file synchronously
    const fileSyncSize = gzipSize.fileSync(filePath);
    console.log(`File sync gzip size: ${fileSyncSize} bytes`);

    // Get gzip size of file asynchronously
    gzipSize.file(filePath).then(fileAsyncSize => {
      console.log(`File async gzip size: ${fileAsyncSize} bytes`);
    });

    // Stream to get gzip size
    fs.createReadStream(filePath)
      .pipe(gzipSize.stream())
      .on('gzip-size', streamSize => {
        console.log(`Stream gzip size: ${streamSize} bytes`);
      });
  });

With these examples, you can see how powerful and flexible the gzip-size library is for determining the gzip-compressed size of strings, buffers, and files. Happy coding!

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