Premium
JAVASCRIPT Snippets.

Implement Secure Server-Side File Uploads with Multer

Securely handle file uploads on the server in Node.js using Multer by implementing crucial validations for file types, sizes, and storing files safely outside the web root.

Implement Server-Side API Rate Limiting to Prevent Abuse

Learn to implement server-side API rate limiting in an Express.js application using `express-rate-limit` to protect against brute-force attacks and service abuse.

Graceful API Rate Limit Handling with Exponential Backoff

Implement robust API rate limit management in JavaScript using exponential backoff and `Retry-After` headers for reliable integration and fewer failed requests.

Implementing OAuth 2.0 PKCE Flow for SPAs

Securely integrate OAuth 2.0 with PKCE (Proof Key for Code Exchange) in your Single-Page Application to authorize users without exposing client secrets.

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.