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JAVASCRIPT Snippets.

Upload Files to API with Progress Tracking

Implement client-side file uploads to a REST API in JavaScript using `XMLHttpRequest` (XHR) or `fetch` with `FormData`, including real-time progress updates.

Client-Side JWT/OAuth Token Refresh

Implement client-side automatic JWT or OAuth access token refreshing to maintain user sessions and securely interact with APIs without re-authentication.

Node.js Secure External API Proxy

Create a Node.js (Express) server-side proxy to securely interact with external APIs, hide API keys, perform data transformations, and manage server-to-server communication.

Custom Hook for Toggling UI Elements (e.g., Modals, Drawers)

Create a reusable React custom hook, `useToggle`, to effortlessly manage the visibility state of modals, sidebars, or any UI component with a simple toggle.

Global State Management with `useContext` and `useReducer`

Implement powerful global state management in React using `useContext` and `useReducer` to avoid prop drilling and maintain centralized, predictable state updates.

Memoizing Function References with `useCallback` for Performance

Optimize React component rendering by using `useCallback` to memoize event handlers and functions, preventing unnecessary re-renders of child components.

Managing Async Operations with `useEffect` Cleanup for Data Fetching

Implement robust data fetching in React components using `useEffect` with proper cleanup to prevent memory leaks and handle unmounted component updates.

Get Element Dimensions and Position (getBoundingClientRect)

Precisely retrieve the size and position of any DOM element relative to the viewport using `getBoundingClientRect()`, essential for dynamic layouts, overlays, and animations.

Creating a Custom Vue 3 Directive for Click Outside

Implement a custom Vue 3 directive to detect clicks outside an element, perfect for closing dropdowns, modals, or context menus efficiently.

Animating List Items with Vue 3 TransitionGroup

Learn to effortlessly animate the insertion, removal, and reordering of list items in Vue 3 using the powerful `<TransitionGroup>` component and CSS.

Managing Reactive Side Effects with Vue 3 `watchEffect`

Discover how to use Vue 3's `watchEffect` to automatically track reactive dependencies and run side effects, simplifying complex reactivity scenarios.

Validate Email Address Format with Regex

A robust JavaScript regular expression snippet to accurately validate the common format of email addresses, ensuring correct input in web forms and applications.