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JAVASCRIPT Snippets.

Toggle CSS Classes to Manage UI States

Efficiently add, remove, or toggle CSS classes on DOM elements to change their appearance or behavior in response to user interactions or application state.

Access and Modify Custom Data Attributes

Learn how to read and update custom data attributes (`data-*`) on HTML elements using JavaScript's `dataset` property, useful for storing extra element-specific information.

Insert HTML Content at Specific DOM Positions

Discover how to insert raw HTML strings or new elements at precise locations relative to an existing element in the DOM using `insertAdjacentHTML` and `insertAdjacentElement`.

Robust API Fetch with Exponential Backoff

Implement resilient API integrations by automatically retrying failed requests with increasing delays, effectively managing rate limits and temporary network issues.

OAuth 2.0 Client Credentials for Server API Calls

Authenticate server-to-server API requests securely using the OAuth 2.0 Client Credentials flow, ideal for background services and daemon applications without user interaction.

Upload Files to API using JavaScript FormData

Efficiently send files, images, or other binary data to a backend API from the browser using the `FormData` object with standard `fetch` or `axios`.

Implement API Polling for Real-time Updates

Continuously fetch fresh data from an API at regular intervals, enabling near real-time updates for dashboards or status displays in web applications.

Real-time API Communication with WebSockets

Establish persistent, full-duplex communication channels with a backend API using WebSockets for instant, event-driven data exchange in web applications.

Implement CSRF Protection in Express.js

Secure your Express.js applications against Cross-Site Request Forgery (CSRF) attacks by generating and validating CSRF tokens with the 'csurf' middleware.

Secure Password Hashing with bcrypt.js

Learn to securely hash and verify user passwords in Node.js applications using the robust 'bcrypt.js' library to prevent credential theft and enhance security.

Enhance Web Security with HTTP Security Headers

Improve your Node.js application's security posture by setting essential HTTP headers like CSP, HSTS, and X-Frame-Options using the 'helmet' middleware for Express.

Sanitize HTML Input to Prevent XSS Attacks

Effectively prevent Cross-Site Scripting (XSS) vulnerabilities in your web applications by sanitizing untrusted HTML input using the robust DOMPurify library.