const { parse } = require('url')
console.log(parse('mailto:abc@example.com'))
/*
Url {
  protocol: 'mailto:',
  slashes: null,
  auth: 'abc',
  host: 'example.com',
  port: null,
  hostname: 'example.com',
  hash: null,
  search: null,
  query: null,
  pathname: null,
  path: null,
  href: 'mail:abc@example.com'
}
*/

encodeURL('mailto:abc@example.com')
// mailto:abc@example.com

encodeURL('mailto:abc@example.com')
// mailto:abc@example.comnull