Kinde has released a new SDK for Next.js 13 that provides a server-side authentication solution leveraging the App Router and server components, eliminating the need to ship JavaScript to the browser. This release aligns with Kinde's commitment to minimizing JavaScript sent to end users, complementing their server-rendered app and lean marketing site built on Astro. The shift towards server rendering by major frameworks like Next.js represents a significant advancement for the web community, though it poses challenges for client-side third-party libraries striving for compatibility. While previous solutions often required wrapping applications in a client-side context, Kinde's new SDK focuses on maintaining the benefits of server rendering by avoiding additional JavaScript bundle size, appealing to engineers prioritizing performance. Feedback can be directed to Kinde's team via email or the Next.js GitHub repository.