URL.protocol

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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A propriedade protocol da interface URL é uma USVString representando o esquema de protocolo da URL, incluindo o final ':'.

Nota: This feature is available in Web Workers.

const url = new URL(
  "https://developer.mozilla.org/pt-BR/docs/Web/API/URL/protocol",
);
console.log(url.protocol); // Logs "https:"

Specification
URL Standard # dom-url-protocol

BCD tables only load in the browser