Redux Thunk

Redux Thunk is Thunk middleware for Redux. With basic Redux, only simple synchronous updates can be done by dispatching an action. By adding middleware, you extend the Redux store's abilities, enabling you to write async logic that interacts with the store.

A thunk is a function that wraps an expression in order to delay its evaluation. Redux Thunk middleware allows you to write action creators that, rather than return an action will return a function instead. If you want to delay the dispatch of an action, or to dispatch only after meeting a certain condition, then the thunk can be used.

Thunks are ideal middleware for a number of cases, in particular for basic Redux side effects logic, complex synchronous logic that must access the store, and simple async logic like AJAX requests.