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JAVASCRIPT Snippets.

Normalize Whitespace: Replace Multiple Spaces with Single

Discover how to clean up text strings in JavaScript by using a regex to replace any sequence of multiple whitespace characters (spaces, tabs, newlines) with a single space.

Mask Sensitive Data (e.g., Credit Card Numbers) for Display

Learn to securely mask sensitive information like credit card numbers in a string using regular expressions, displaying only the last few digits for privacy and security.

Extract Placeholders (e.g., {{key}}) from Template Strings

Learn how to parse template strings using regular expressions to extract dynamic placeholders, like `{{variable_name}}`, for processing in web applications or UI rendering.

Capitalize First Letter of Each Word (Title Case)

Apply title case to any string in JavaScript by using a regular expression to efficiently capitalize the first letter of every word, useful for names and headlines.

Validate Email Addresses with Regular Expressions

Learn to validate common email address formats using a robust regular expression in JavaScript, essential for web form input validation.

Extract Specific Query Parameters from a URL

Discover how to use regular expressions in JavaScript to efficiently extract individual query parameters and their values from a URL string.

Validate and Format US Phone Numbers with Regex

Learn to validate common 10-digit US phone number formats and extract its components using regular expressions in JavaScript.

Validate IPv4 Addresses using Regular Expressions

Implement robust IPv4 address validation in JavaScript with a regular expression, ensuring network inputs adhere to the correct format.

Parse Custom Log-like Strings with Regex Capture Groups

Learn to extract specific data fields like timestamp, level, and message from custom log or structured strings using regular expression capture groups in JavaScript.

Fetching Data from an API with Async/Await

Learn how to make a basic GET request to an API using JavaScript's modern `fetch` API with `async/await` for clean, readable asynchronous code.

Sending JSON Data to an API with a POST Request

Discover how to make a POST request using the `fetch` API to send JSON data to a server, crucial for creating or updating resources in web applications.

Making Authenticated API Requests with a Bearer Token

Learn to securely integrate APIs by including a Bearer token in your `fetch` requests, a common method for authenticating users or applications.