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JAVASCRIPT Snippets.

Extracting All Numbers from a String

Learn to easily extract all numeric values, including integers and decimals, from any string using a concise JavaScript regex pattern.

Robust API Error Handling with Custom JavaScript Errors

Learn to create a reusable JavaScript `fetch` wrapper that gracefully handles various HTTP status codes and API error messages, throwing custom error types for better control.

Authenticating JavaScript `fetch` Requests with JWT

Secure your client-side JavaScript API calls by learning how to include JSON Web Tokens (JWT) in the Authorization header for protected endpoints using `fetch`.

Node.js Express API Proxy for CORS & Key Hiding

Create a simple Node.js Express proxy server to securely route client-side API requests, bypass CORS restrictions, and protect sensitive API keys from public exposure.

JavaScript API Polling with Interval Control

Implement controlled API polling in JavaScript to periodically check for new data or updates from an API endpoint, with options to start, stop, and configure the polling interval.

Mapping Complex API Responses to Simple Data Models

Learn to transform verbose or inconsistently structured API response data into a clean, consistent, and easy-to-use local data model in JavaScript for better application maintainability.

Efficiently Querying GraphQL APIs with Apollo Client

Learn how to integrate and query a GraphQL API in a React application using Apollo Client, focusing on data fetching and state management.

Securely Authenticating API Requests with API Keys in Node.js

Learn to securely add an API key to outgoing HTTP requests in Node.js, typically by including it in the request headers or query parameters.

Enhancing Webhook Security: Verifying Signatures in Node.js

Learn to implement webhook signature verification in Node.js to ensure incoming webhook payloads are authentic and untampered, improving API security.

Managing Multiple Fetch Requests with AbortController in JavaScript

Implement a robust pattern to manage and cancel multiple concurrent Fetch API requests using AbortController, improving responsiveness and resource management.

Client-Side API Response Caching with localStorage and TTL

Implement simple client-side caching for API responses using JavaScript's `localStorage`, including a time-to-live (TTL) mechanism to ensure data freshness.

Implementing CSRF Protection in Node.js Express Applications

Protect your Node.js Express application from Cross-Site Request Forgery (CSRF) attacks using the csurf middleware to generate and validate CSRF tokens.