Next.js font optimization: Adding custom and Google fonts

The article explores the integration and optimization of web fonts in Next.js applications, particularly through the use of Next.js v13's next/font system. This system simplifies font management by self-hosting Google Fonts and optimizing their loading, which reduces external network requests and improves compliance with GDPR by preventing the transfer of user data to third-party services. It details the process of embedding custom and Google Fonts, addressing issues like flash of unstyled text (FOUT) and flash of invisible text (FOIT) by employing strategies such as preloading fonts and using CSS properties like font-display and size-adjust. The article further explains how to manage multiple font styles using CSS variables and Tailwind CSS, offering a streamlined approach for developers to maintain consistent and efficient typography across their web projects. Additionally, it includes practical examples and code snippets to guide developers in implementing these strategies effectively.