Check if a JavaScript string is a URL

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If you want to check whether a string is valid HTTP URL, you can use URL constructor (it will throw on malformed string):

function isValidHttpUrl(string) {
  let url;
  
  try {
    url = new URL(string);
  } catch (_) {
    return false;  
  }

  return url.protocol === "http:" || url.protocol === "https:";
}

Note: Per RFC 3886, URL must begin with a scheme (not limited to http/https), e. g.:

  • www.example.com is not valid URL (missing scheme)
  • javascript:void(0) is valid URL, although not an HTTP one
  • http://.. is valid URL with the host being .. (whether it resolves depends on your DNS)
  • https://example..com is valid URL, same as above

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