The Ultimate
Snippet Library.

Manage Element Attributes and CSS Classes

Discover JavaScript methods to efficiently add, remove, and toggle CSS classes, along with setting and getting custom data attributes on HTML elements.

Traverse the DOM Tree with JavaScript

Learn how to navigate the Document Object Model (DOM) using JavaScript, accessing an element's parent, children, and siblings to locate specific elements.

Update Element Text and HTML Content Safely

Understand the difference between `textContent` and `innerHTML` for updating element content, and learn when to use each for security and formatting purposes.

Creating a Sticky Footer with Flexbox

Implement a sticky footer that consistently stays at the bottom of the viewport, pushing content above it to fill available space using Flexbox layout.

Responsive Navigation Bar with Flexbox

Build a flexible navigation bar that adapts to screen sizes, displaying horizontally on large screens and stacking vertically on smaller devices using Flexbox and media queries.

Effortless Centering with Flexbox

Master the simple and robust way to perfectly center any element, both horizontally and vertically, within its parent container using Flexbox properties.

Distributing Space Evenly Between Flex Items

Learn to distribute space around, between, or evenly across flex items, creating balanced layouts with consistent gaps, using `justify-content` and the `gap` property.

Implement CSRF Protection with Express and `csurf`

Protect web applications from Cross-Site Request Forgery (CSRF) attacks by integrating a token-based middleware in Express.js for secure form submissions.

Configure Essential Security HTTP Headers in Express

Enhance web application security by setting critical HTTP headers like HSTS, CSP, X-Frame-Options, and X-Content-Type-Options using Helmet.js in Express.

Server-Side Input Sanitization for XSS Prevention

Sanitize user-provided input on the server-side to prevent Cross-Site Scripting (XSS) attacks, ensuring only safe content is processed and displayed.

Configure Secure and HttpOnly Cookies in Express

Enhance session security by setting `HttpOnly`, `Secure`, and `SameSite` flags on cookies in Express.js, protecting against XSS attacks and CSRF.

Get the Previous Value of a State or Prop

A custom React hook to efficiently track and return the previous value of any state or prop, ideal for comparing current and past values in useEffect.