image-utility-library/src/compress.js

A Node.js library for compressing, resizing, cropping, and applying effects to images.

import sharp from 'sharp';
import imagemin from 'imagemin';
import imageminMozjpeg from 'imagemin-mozjpeg';
import imageminPngquant from 'imagemin-pngquant';

/**
 * Compress an image buffer.
 * @param {Buffer} imageBuffer - The image buffer.
 * @param {Number} quality - Compression quality (1-100).
 * @returns {Promise<Buffer>} - Compressed image buffer.
 */
const compressImage = async (imageBuffer, quality = 70) => {
  try {
    // Get image metadata to determine format
    const metadata = await sharp(imageBuffer).metadata();
    
    // Initial compression with Sharp
    let compressed = await sharp(imageBuffer)
      .toFormat(metadata.format)
      .toBuffer();

    // Further compression with imagemin
    compressed = await imagemin.buffer(compressed, {
      plugins: [
        imageminMozjpeg({
          quality,
          progressive: true
        }),
        imageminPngquant({
          quality: [Math.max(0.1, quality / 100), Math.min(0.9, quality / 100)],
          speed: 4
        })
      ]
    });

    return compressed;
  } catch (error) {
    console.error('Error compressing image:', error);
    throw error;
  }
};

export default compressImage;