The Ultimate
Snippet Library.

Dynamically Attaching Custom Headers to API Requests

Learn to programmatically add and modify custom HTTP headers to `fetch` API requests in JavaScript, useful for passing dynamic context like tenant IDs, language preferences, or tracing information.

Simple Webhook Sender and Receiver with Node.js

Set up a basic Node.js Express server to receive incoming webhooks and a client-side snippet to send a simple webhook payload, demonstrating the fundamental mechanism of webhook communication.

Robust API Fetch with Exponential Backoff and Retry

Implement a robust API fetching utility in JavaScript that automatically retries failed requests using an exponential backoff strategy, enhancing application resilience.

Client-Side API Response Caching in Local Storage

Implement client-side caching for API responses using `localStorage` with a configurable expiry time, reducing redundant requests and improving application performance.

Authenticating API Requests with an API Key

Learn to securely send an API key with your HTTP requests, typically in the `Authorization` header or as a query parameter, for authenticating web service calls.

Programmatically Fetch All Pages from an Offset/Limit API

Implement a JavaScript function to iteratively fetch and aggregate all available data from an API that uses offset and limit-based pagination, ensuring full data retrieval.

Concurrently Fetch Multiple API Endpoints with Promise.all

Learn how to efficiently make multiple API requests concurrently using `Promise.all` in JavaScript, waiting for all to complete before processing their combined results.

Implement CSRF Protection with `csurf`

Implement robust Cross-Site Request Forgery (CSRF) protection in your Node.js Express application using the `csurf` middleware to secure state-changing requests.

Server-Side Input Validation with `express-validator`

Implement robust server-side input validation and sanitization using `express-validator` to protect against injection attacks and ensure data integrity in your Node.js application.

Essential Security Headers with Helmet.js

Configure essential HTTP security headers like HSTS, X-Frame-Options, and X-Content-Type-Options in Express.js using `helmet` to bolster your web application's defense.

Secure Session Management in Express.js

Secure user sessions in Express.js by properly configuring `express-session` with `secret`, `resave`, `saveUninitialized`, and `cookie` options for production environments.

Find Differences (Keys & Values) Between Two Associative Arrays

Discover how to compare two associative arrays in PHP and identify all differences, including both differing keys and values, using `array_diff_assoc`.