index.js

#!/usr/bin/env node

const sharp = require('sharp');
const fs = require('fs-extra');
const path = require('path');

// Directory containing the images
const inputDir = './';
const outputDir = './optimized_images';

// Ensure the output directory exists
fs.ensureDirSync(outputDir);

// Path to the MozJPEG binary
// const mozjpegPath = '/usr/local/bin/cjpeg'; // Adjust the path according to your MozJPEG installation

// Function to optimize an image using MozJPEG
async function optimizeImage(inputPath, outputPath) {
    try {
        const buffer = await sharp(inputPath)
            .jpeg({ quality: 85, mozjpeg: true })
            .toBuffer();

        await fs.writeFile(outputPath, buffer);
        console.log(`Optimized ${inputPath} -> ${outputPath}`);
    } catch (error) {
        console.error(`Error optimizing ${inputPath}:`, error);
    }
}

// Process all .png and .jpg files in the directory
fs.readdir(inputDir, (err, files) => {
    if (err) {
        console.error('Error reading directory:', err);
        return;
    }

    files.forEach(file => {
        const ext = path.extname(file).toLowerCase();
        if (ext === '.png' || ext === '.jpg' || ext === '.jpeg') {
            const inputPath = path.join(inputDir, file);
            const outputFilename = path.basename(file, ext) + '.jpg';
            const outputPath = path.join(outputDir, outputFilename);

            optimizeImage(inputPath, outputPath);
        }
    });
});

package.json

{
  "name": "optimize-images",
  "version": "1.0.0",
  "description": "Optimize images using sharp and mozjpeg",
  "bin": "./index.js",
  "dependencies": {
    "sharp": "^0.33.4",
    "fs-extra": "^11.2.0"
  }
}