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JAVASCRIPT Snippets.

Converting Kebab-Case Strings to CamelCase

Transform kebab-case strings (e.g., 'my-component') into camelCase (e.g., 'myComponent') using a concise JavaScript regular expression.

Extracting Content Within Double Curly Braces

Learn to extract all dynamic content enclosed within double curly braces (e.g., `{{variable}}`) from a string using a JavaScript regex pattern.

Extracting and Normalizing Phone Numbers

Learn to extract and normalize various phone number formats into a consistent `(XXX) XXX-XXXX` pattern using JavaScript regular expressions.

Validate and Sanitize User Input on Server

Secure your Node.js Express API by validating and sanitizing user input to prevent common vulnerabilities like XSS and SQL injection. Uses express-validator.

Enhance Web Security with HTTP Headers

Protect your Node.js Express application from common web vulnerabilities by implementing essential HTTP security headers using the Helmet middleware.

Hash Passwords Securely with Bcrypt

Learn to securely hash and verify user passwords in your Node.js applications using the robust bcrypt library to protect against credential breaches.

Configure Cross-Origin Resource Sharing (CORS) Securely

Properly configure CORS in your Node.js Express API to control which origins can access your resources, preventing unauthorized cross-domain requests.

Protect Against Cross-Site Request Forgery (CSRF)

Implement robust CSRF protection in your Node.js Express application to prevent attackers from tricking users into executing unwanted actions.

Robust API Fetch with Retry and Exponential Backoff

Implement resilient API calls in JavaScript using `fetch` with automatic retry logic and exponential backoff to handle transient network issues and temporary server unavailability.

Upload Files to API with Progress Tracking

Implement client-side file uploads to a REST API in JavaScript using `XMLHttpRequest` (XHR) or `fetch` with `FormData`, including real-time progress updates.

Client-Side JWT/OAuth Token Refresh

Implement client-side automatic JWT or OAuth access token refreshing to maintain user sessions and securely interact with APIs without re-authentication.

Node.js Secure External API Proxy

Create a Node.js (Express) server-side proxy to securely interact with external APIs, hide API keys, perform data transformations, and manage server-to-server communication.