URL: origin property

{{APIRef("URL API")}} {{AvailableInWorkers}}

The origin read-only property of the {{domxref("URL")}} interface returns a string containing the Unicode serialization of the origin of the represented URL.

The exact structure varies depending on the type of URL:

• For URLs using the ftp:, http:, https:, ws:, and wss: schemes, the {{domxref("URL.protocol", "protocol")}} followed by //, followed by the {{domxref("URL.host", "host")}}. Same as host, the {{domxref("URL.port", "port")}} is only included if it's not the default for the protocol.
• For URLs using file: scheme, the value is browser dependent.
• For URLs using the blob: scheme, the origin of the URL following blob:, but only if that URL uses the http:, https:, or file: scheme. For example, blob:https://mozilla.org will have https://mozilla.org.

For all other cases, the string "null" is returned.

Value

A string.

Examples

The following examples show how the origin property is computed for a blob: URL, an http: URL, and one using a non-default port:

const url = new URL("blob:https://mozilla.org:443/");
console.log(url.origin); // 'https://mozilla.org'

const url = new URL("http://localhost:80/");
console.log(url.origin); // 'http://localhost'

const url = new URL("https://mozilla.org:8080/");
console.log(url.origin); // 'https://mozilla.org:8080'

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• The {{domxref("URL")}} interface
• {{Glossary("origin")}} glossary term