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JAVASCRIPT Snippets.

Sanitize User Input to Prevent XSS in React

Learn to sanitize user-generated content in React using a library like DOMPurify to prevent Cross-Site Scripting (XSS) vulnerabilities and safely render HTML.

Implement CSRF Protection with Tokens in Node.js Express

Protect your Node.js Express application from Cross-Site Request Forgery (CSRF) attacks by generating and verifying CSRF tokens for state-changing requests.

Secure OAuth Token Refresh Flow in JavaScript

Learn to implement a secure OAuth token refresh mechanism in JavaScript to maintain API access without re-authenticating users, handling token expiration gracefully.

Client-Side API Retries with Exponential Backoff

Implement an intelligent client-side retry mechanism for API calls using exponential backoff to handle transient network issues or rate limits gracefully.

Verify Webhook Signatures in Node.js for Security

Learn to secure your Node.js webhook endpoints by verifying incoming request signatures, ensuring data integrity and preventing unauthorized requests.

Execute Concurrent API Requests with a Limited Pool

Efficiently run multiple API requests concurrently while respecting concurrency limits using a custom Promise-based pool, preventing API overload.

Download Files from API with Progress Tracking

Learn to download files from an API endpoint using Fetch API with real-time progress updates, enhancing user experience for large file transfers.

useFetch for declarative data fetching

A reusable React hook for declaratively fetching data from an API, managing loading, error, and data states efficiently in your components.

useClickOutside to detect clicks outside an element

A powerful React hook to detect clicks occurring outside a specific DOM element, useful for closing dropdowns, modals, or context menus.

usePrevious to access a component's previous state or props

A concise React hook that provides access to the previous value of a state or prop, enabling comparison and side effects based on changes.

useIntersectionObserver for scroll-based effects

A flexible React hook to detect when an element enters or exits the viewport, perfect for lazy loading, infinite scrolling, or scroll animations.

useMediaQuery for responsive component rendering

A useful React hook that allows components to react to CSS media queries, enabling dynamic rendering based on viewport size or device characteristics.