SPRING CONCEPTS
React
Spring Concepts / React
React builds a browser interface from components and state.
Understand the idea
A component returns JSX describing its UI. State changes cause rendering updates. Controlled inputs use value and onChange, event handlers call the API, and list keys identify entries. React handles presentation; the backend remains authoritative for data and access rules.
A concrete example
const [title, setTitle] = useState("");
<input value={title}
onChange={e => setTitle(e.target.value)} />In the application
App.jsx implements registration, login, feedback, and personal CRUD. It fetches already-authorized data from Spring Boot.
Client-side checks improve usability but cannot enforce server authorization.