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JAVASCRIPT Snippets.

Access and Manipulate HTML Data Attributes

Learn how to retrieve and update custom data attributes (e.g., `data-id`, `data-status`) on HTML elements using JavaScript's `dataset` property for storing element-specific information.

Insert HTML Content Relative to an Element Using `insertAdjacentHTML`

Learn to precisely insert raw HTML strings into the DOM at specific positions (beforebegin, afterbegin, beforeend, afterend) relative to an existing element using `insertAdjacentHTML`.

Efficiently Remove a Specific Element from the DOM

Learn multiple ways to remove an HTML element from the Document Object Model using JavaScript, including `element.remove()` and `parentElement.removeChild()`.

Implementing CSRF Protection with Express

Protect your Node.js Express application from Cross-Site Request Forgery (CSRF) attacks by integrating a robust CSRF token generation and validation middleware like `csurf`.

Preventing XSS with HTML Escaping

Learn how to effectively sanitize user-generated input by escaping HTML special characters in JavaScript, a crucial step to prevent Cross-Site Scripting (XSS) vulnerabilities when rendering content.

Performing a Basic GET Request with Async/Await

Learn to make an asynchronous GET request to an API using modern JavaScript fetch API, including essential error handling and async/await syntax for cleaner code.

Sending Authenticated POST Requests with JSON Payload

Discover how to send a POST request to an API with JSON data, applying a Bearer token for authentication using the JavaScript fetch API and proper headers.

Uploading Files to an API using FormData

Learn to securely upload files like images or documents to a REST API endpoint using JavaScript's fetch API and the FormData object for multipart/form-data.

Canceling Pending API Requests with AbortController

Improve user experience and optimize network usage by learning to cancel pending fetch API requests using the AbortController in JavaScript, preventing stale data.

Retrying Failed API Calls with Exponential Backoff

Build more resilient web applications by implementing an exponential backoff strategy to automatically retry failed API requests gracefully after transient network issues.

Getting the Previous Value of State or Props with usePrevious Hook

Learn to create a custom React hook, `usePrevious`, to easily access the prior value of any state or prop, essential for comparisons and lifecycle logic.

Detecting Clicks Outside an Element with useClickOutside Hook

Implement a custom React `useClickOutside` hook to trigger a callback when a user clicks outside a specified DOM element, perfect for dropdowns and modals.