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# URL.port

The **`port`** property of the `URL` interface is
a string containing the port number of the URL.

> **Note:** If an input string passed to the `URL()` constructor doesn't contain an explicit port number (e.g., `https://localhost`) or contains a port number that's the default port number corresponding to the protocol part of the input string (e.g., `https://localhost:443`), then in the `URL` object the constructor returns, the value of the port property will be the empty string: `''`.

## Value

A string.
