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JAVASCRIPT Snippets.

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.

Implementing API Call Retries with Exponential Backoff

Build resilient API integrations by adding an exponential backoff retry mechanism to your `fetch` requests, improving reliability for transient network or server errors.

Create and Insert New DOM Elements Dynamically

Learn to dynamically create new HTML elements using `document.createElement()` and append them to the DOM with `appendChild()` or `insertBefore()` in JavaScript.

Safely Update Element Content: textContent vs innerHTML

Understand the crucial difference between `textContent` and `innerHTML` for updating DOM elements. Use `textContent` for plain text and `innerHTML` for HTML content.