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JAVASCRIPT Snippets.

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.

Extract All CSS Hex Color Codes from a String

A JavaScript regex snippet to accurately find and extract all 3-digit and 6-digit CSS hexadecimal color codes (e.g., #FFF, #C0C0C0) from any text.

Parse Query Parameters from a URL String

Use a JavaScript regex pattern to extract and parse all key-value pairs from the query string portion of a URL, useful for client-side routing.

Sanitize a String for Use as a URL Slug

Transform any string into a clean, SEO-friendly URL slug by converting to lowercase, replacing special characters with hyphens, and trimming excess.

Set Secure Cookie Attributes for Web Applications

Secure your web application's cookies in Express.js by implementing `HttpOnly`, `Secure`, and `SameSite` attributes, protecting against XSS, MITM, and CSRF attacks.

Validate an IPv4 Address

Learn how to use a regular expression in JavaScript to accurately validate if a given string represents a valid IPv4 address, ensuring correct octet ranges.

Normalize Whitespace: Replace Multiple Spaces

Learn to clean up user input or text content by using a simple JavaScript regex to replace consecutive whitespace characters with a single space.

Extract All Numbers (Integers & Floats) from a String

Learn to extract both integer and floating-point numbers from a text string using a versatile JavaScript regular expression pattern and convert them to numeric types.

Extract All URLs (HTTP/HTTPS) from a String

Learn to efficiently extract all complete HTTP or HTTPS URLs, including subdomains and paths, from any given string using JavaScript regular expressions.

Validate International Phone Numbers with Optional Country Code

Implement a robust regular expression in JavaScript to validate international phone numbers, supporting optional country codes, spaces, hyphens, and parentheses.