// Created on savesnippets.com · https://savesnippets.com/52hTfrh7ynq7Ms
function isValidUrl(str, protocols = ['http:', 'https:']) {
  try {
    const url = new URL(str);
    return protocols.length === 0 || protocols.includes(url.protocol);
  } catch {
    return false;
  }
}

// Usage
console.log(isValidUrl('https://example.com'));          // true
console.log(isValidUrl('ftp://files.example.com'));      // false (http/https only)
console.log(isValidUrl('ftp://files.example.com', [])); // true (any protocol)
console.log(isValidUrl('not a url'));                    // false