Is There a Robust, Regex-Free Way to Validate URLs in JavaScript?

Robust URL Validation in JavaScript

JavaScript provides several useful tools for manipulating and validating strings. In this article, we will specifically focus on checking whether a given string represents a valid URL, excluding the use of regular expressions.

Determining Validity

To determine the validity of a URL, we can utilize the URL constructor. When encountering a malformed URL, this constructor will throw an error. Here's a JavaScript function that employs this approach:

However, it's important to note that this method only checks for the presence of a scheme (e.g., "http" or "https"), as defined by RFC 3886. Therefore, the following scenarios are considered valid URLs:

• www.example.com (scheme is missing)
• javascript:void(0) (non-HTTP scheme)
• http://.. (host is "..")
• https://example..com (host includes "..")

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