How to analyze your Next.js app bundles

Next.js is a framework for building React applications, focusing on optimizing code and minimizing bundle sizes to enhance performance. The article explains how analyzing a Next.js app's bundle can identify optimization opportunities, with a focus on using the @next/bundle-analyzer package. This package generates reports detailing bundle sizes and compositions, allowing developers to pinpoint large or unnecessary code blocks. The article also discusses advanced techniques like customizing webpack configurations, code splitting, and replacing heavy libraries with lighter alternatives to further optimize performance. By using these strategies, developers can improve load speeds and user experiences by reducing bundle sizes and identifying bottlenecks, such as duplicated or unused npm packages and large image files. The piece concludes by highlighting alternative tools for bundle analysis, such as webpack-bundle-analyzer, and underscores the importance of bundle analysis in optimizing Next.js applications.