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JAVASCRIPT Snippets.

Prevent Clickjacking with X-Frame-Options Header

Protect web applications from clickjacking attacks by implementing the X-Frame-Options HTTP header, controlling whether your site can be embedded in iframes or frames.

Extract Image URLs from HTML with Regex

Learn to use a regular expression in JavaScript to efficiently find and extract all 'src' attributes of 'img' tags from an HTML string for data processing.

Sanitize HTML Input by Removing Script Tags

Prevent Cross-Site Scripting (XSS) attacks by using a robust regular expression in JavaScript to effectively remove all '<script>' tags and their content from user-provided HTML input.

Toggle CSS Classes on Elements

Learn to effortlessly add, remove, or toggle CSS classes on DOM elements using JavaScript's classList API, enabling dynamic styling based on user interaction.

Implement Global Theming with React's useContext

Learn how to manage application-wide themes (e.g., light/dark mode) using React's powerful useContext hook, providing a simple and efficient global state solution.

Optimize Expensive Calculations with React's useMemo

Improve React component performance by memoizing the result of expensive calculations, preventing unnecessary re-renders and re-executions with the useMemo hook.

Handle Asynchronous Operations with a Custom useAsync Hook

Create a versatile custom React hook to manage the state of any asynchronous operation, centralizing loading, error, and data states for cleaner and more robust component logic.

Detect Element Visibility with a Custom useIntersectionObserver Hook

Implement features like lazy loading images, infinite scrolling, or scroll-triggered animations by creating a custom React hook that utilizes the Intersection Observer API.

Simplify Boolean State Management with a Custom useToggle Hook

Streamline the handling of simple boolean states (e.g., toggling a modal, menu visibility, or a checkbox) in React components with a clean and reusable custom useToggle hook.

Fetch All Paginated API Data Sequentially

Efficiently retrieve all available data from a paginated API endpoint by iteratively fetching subsequent pages until no more data is returned, ensuring comprehensive data collection.

Perform Multiple API Requests Concurrently with Promise.allSettled

Execute several independent API calls in parallel using JavaScript's Promise.allSettled, efficiently gathering all results and errors without stopping on the first rejection.

Create a Server-Side Webhook Listener with Signature Verification

Set up an Express.js endpoint to securely receive and validate webhook payloads by verifying a shared secret signature, preventing tampering and unauthorized requests.