ReactA JavaScript library for building UIs — component trees and declarative rendering for the web. 19 made async transitions and server actions first-class — simplifying forms, mutations, and streaming without third-party frameworks owning the pattern. It completed years of concurrent features and set the baseline Next.js, Remix, and Expo adopted through 2025.

ReactA JavaScript library for building UIs — component trees and declarative rendering for the web. 19 shipped Actions and server components as stable platform primitives.

Built-in async state handling reduced framework-specific form and mutation boilerplate.