Gatsby

Gatsby is a React-based static site generator that builds optimized websites from data pulled from various sources including CMSs, APIs, databases, and the file system. At build time, Gatsby fetches all data, processes it through a unified GraphQL data layer, and generates pre-rendered HTML pages with progressive enhancement that hydrate into full React applications on the client.

The framework includes aggressive performance optimizations by default: code splitting per route, prefetching of linked pages, responsive image generation with lazy loading and blur-up placeholders, and inline critical CSS. Its plugin ecosystem extends functionality for data sourcing, image processing, analytics integration, and SEO optimization.

For web development, Gatsby pioneered many patterns that other frameworks later adopted, particularly treating all data sources as equal through a unified query layer. It remains a solid choice for blogs, documentation, and marketing pages where build-time rendering is appropriate. However, its market position has shifted as Next.js and Astro offer more flexible rendering strategies without requiring everything to be processed through GraphQL at build time, addressing pain points around build speed and learning curve.