Typescript + React

Fetch and cache remote data in React using the SWR library with automatic revalidation, error retry, optimistic updates, and TypeScript generics for.

Implement a typed error boundary in React with TypeScript that catches render errors, displays fallback UI, logs error details, and supports recovery.

Upload files in React with a progress bar using XMLHttpRequest and FormData. Supports drag-and-drop, multiple files, file type validation, and upload.

Validate React form fields using a custom useForm hook with real-time error messages, submission blocking, and TypeScript type safety for form data and.

Implement JWT authentication in React using Context API and useReducer. Includes login, logout, token refresh, protected route wrapper, and automatic token.

Manage global state in React using Zustand with TypeScript, including slice patterns, async actions, devtools middleware, and selector-based subscriptions.