<ul data-eligibleForWebStory="true"><li>Phone numbers play a crucial role in web applications for user sign-ups, contact forms, and two-factor authentication.</li><li>Consistent formatting and normalization of phone numbers are essential to prevent validation issues and ensure a polished user experience.</li><li>Techniques like cleaning, validating, and formatting phone numbers help prevent database duplicates, simplify comparisons, and ensure consistent display.</li><li>Using regex patterns, libraries like libphonenumber-js, real-time formatting on input, and validation practices are key to effective phone number handling in JavaScript.</li></ul>

JavaScript Phone Number Formatting: A Comprehensive Guide

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