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JAVASCRIPT Snippets.

Implement API Rate Limit Retries with Exponential Backoff

Gracefully handle 429 'Too Many Requests' API errors with robust retry logic using exponential backoff in JavaScript for reliable integrations.

Upload Files to an API via Multipart/form-data in JavaScript

Learn to send files to a REST API endpoint using `FormData` and `fetch` in JavaScript, demonstrating secure and efficient multipart/form-data uploads.

Verify Webhook Signatures with HMAC-SHA256 in Node.js

Secure your Node.js webhook endpoints by verifying incoming signatures using HMAC-SHA256, ensuring data integrity and preventing spoofing.

Execute a Simple GraphQL Query using `fetch` in JavaScript

Learn to perform basic GraphQL queries and mutations from a client-side JavaScript application using the native `fetch` API, without external libraries.

Implement a useDebounce Hook for Delayed Value Updates

Learn how to create a custom React useDebounce hook to delay updating a value until a specified time has passed, perfect for search inputs or frequent events.

Persist React State with a useLocalStorage Hook

Create a custom React hook, useLocalStorage, to automatically synchronize component state with the browser's local storage, ensuring data persistence.

Create a Reusable useFetch Hook for Data Fetching

Develop a custom React useFetch hook to manage asynchronous data fetching, providing loading, error, and data states for cleaner component logic.

Track Previous State or Prop Values with usePrevious Hook

Learn to create a simple yet powerful React usePrevious hook to easily access the previous value of any state or prop, useful for comparing changes.

Implement Lazy Loading with useIntersectionObserver Hook

Build a React useIntersectionObserver hook to efficiently detect when an element enters or leaves the viewport, enabling lazy loading or scroll-based animations.

Implement Cross-Site Request Forgery (CSRF) Protection in Express.js

Safeguard your Express.js applications against CSRF attacks by integrating the `csurf` middleware, ensuring that all state-changing requests originate from your domain.

Implement API Rate Limiting to Prevent Abuse in Express.js

Protect your Express.js API endpoints from brute-force attacks and excessive requests by implementing robust rate limiting using the `express-rate-limit` middleware.

Validate a Common Email Address Format

A robust JavaScript regex pattern to validate common email address formats, ensuring proper structure for web forms and data processing.