fetchUserByIdfulfilled

fetchUserByIdfulfilled is a term used in asynchronous programming to denote the successful completion of a fetch operation that retrieves a user by their identifier. In many modern JavaScript applications, similar terms appear as part of a promise or thunk lifecycle, with a common pattern of naming action types as fetchUserById/fulfilled. The concatenated form fetchUserByIdfulfilled may occur in systems that use non-delimited identifiers or as a custom event name in messaging frameworks.

Payload and semantics: When invoked successfully, the fulfilled event carries a payload containing the user data returned by the API. Typical fields include id, name, email, and profile attributes. The exact schema depends on the backend API and the client model.

Usage in state management: The fulfilled action signals UI components and reducers that the requested user data is ready to be consumed. State updates usually set loading to false, store the user object, and clear any previous errors. Components may re-render to display the retrieved user details.

Relation to API design: In a RESTful pattern, the operation corresponds to a GET request to /users/{id}. On success, the HTTP 200 response yields a user object, which is then carried in the fulfilled action’s payload for consumption by the application state.

Notes: If the fetch fails, a corresponding fetchUserByIdrejected action would be dispatched instead; error handling should reflect the nature of the failure, such as network issues or a 404 not found for a missing user.