Vuex
Vuex is a state management pattern and library for Vue.js applications. It serves as a centralized store for all the components in an application, with rules ensuring that the state can only be mutated in a predictable fashion. It integrates deeply with Vue's official devtools extension to provide advanced features like time-travel debugging and state snapshot export.
Developers should use Vuex when building medium to large-scale Vue.js applications where managing state across multiple components becomes complex and error-prone. It is particularly useful for applications with shared state, such as user authentication data, shopping carts, or multi-step forms, as it provides a single source of truth and enforces a clear separation between state mutations and component logic.