Premium
JAVASCRIPT Snippets.

Client-Side API Response Caching with IndexedDB

Enhance web application performance and offline capabilities by caching API responses securely and persistently using the browser's IndexedDB.

Fetching Data from a REST API with Loading and Error States

Learn to perform basic GET requests using JavaScript's Fetch API, including handling loading indicators and gracefully managing potential API errors for a better user experience.

Sending JSON Data to a REST API using POST Request

Discover how to perform a POST request with the Fetch API to send JSON data to a server. This snippet covers setting headers, stringifying the body, and handling responses.

Secure API Key Authentication for Node.js Backend Requests

Learn to securely integrate third-party APIs using API key authentication in a Node.js Express application. This snippet demonstrates how to send an API key in headers with Axios.

Polling an API for Real-time Data Updates in JavaScript

Implement API polling in JavaScript to periodically fetch data and keep your application updated without using WebSockets. Learn to manage intervals and clear polling.

Uploading Files to a REST API using JavaScript FormData

Learn to securely upload files to a REST API endpoint from a web frontend using JavaScript's FormData object and the Fetch API, handling various file types.

Toggle CSS Class for Dynamic Styling

Learn to dynamically add or remove CSS classes from DOM elements using JavaScript's classList API for interactive UI updates and state management.

Create and Append New DOM Elements

Discover how to programmatically create new HTML elements and append them to an existing parent element in the DOM using createElement and appendChild.

Insert Elements Before or After Others

Master precise DOM element insertion using insertBefore and insertAdjacentElement to place new elements relative to existing ones, controlling their position.

Validate URLs with a Comprehensive Regex

Implement a JavaScript regex pattern to validate various URL formats, including HTTP/HTTPS protocols, domains, ports, paths, and query parameters.

Enforce Strong Passwords with Regex

Validate password strength in JavaScript using regex to ensure it contains a mix of uppercase, lowercase, numbers, and special characters, meeting minimum length requirements.

Extract Hashtags from Text using Regex

Discover how to efficiently extract all hashtags (words prefixed with '#') from a given text string in JavaScript using a simple and effective regular expression.