URL
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The URL
interface is used to parse, construct, normalize, and encode URLs. It works by providing properties which allow you to easily read and modify the components of a URL.
You normally create a new URL
object by specifying the URL as a string when calling its constructor, or by providing a relative URL and a base URL. You can then easily read the parsed components of the URL or make changes to the URL.
Constructor
URL()
-
Creates and returns a
URL
object from a URL string and optional base URL string. Throws if the passed arguments don't define a valid URL.
Instance properties
hash
-
A string containing a
'#'
followed by the fragment identifier of the URL. host
-
A string containing the domain (that is the hostname) followed by (if a port was specified) a
':'
and the port of the URL. hostname
-
A string containing the domain of the URL.
href
-
A stringifier that returns a string containing the whole URL.
origin
Read only-
Returns a string containing the origin of the URL, that is its scheme, its domain and its port.
password
-
A string containing the password specified before the domain name.
pathname
-
A string containing an initial
'/'
followed by the path of the URL, not including the query string or fragment. port
-
A string containing the port number of the URL.
protocol
-
A string containing the protocol scheme of the URL, including the final
':'
. search
-
A string indicating the URL's parameter string; if any parameters are provided, this string includes all of them, beginning with the leading
?
character. searchParams
Read only-
A
URLSearchParams
object which can be used to access the individual query parameters found insearch
. username
-
A string containing the username specified before the domain name.
Static methods
canParse()
-
Returns a boolean indicating whether or not a URL defined from a URL string and optional base URL string is parsable and valid.
createObjectURL()
-
Returns a string containing a unique blob URL, that is a URL with
blob:
as its scheme, followed by an opaque string uniquely identifying the object in the browser. parse()
-
Creates and returns a
URL
object from a URL string and optional base URL string, or returnsnull
if the passed parameters define an invalidURL
. revokeObjectURL()
-
Revokes an object URL previously created using
URL.createObjectURL()
.
Instance methods
toString()
-
Returns a string containing the whole URL. It is a synonym for
URL.href
, though it can't be used to modify the value. toJSON()
-
Returns a string containing the whole URL. It returns the same string as the
href
property.
Usage notes
The constructor takes a url
parameter, and an optional base
parameter to use as a base if the url
parameter is a relative URL:
const url = new URL("../cats", "http://www.example.com/dogs");
console.log(url.hostname); // "www.example.com"
console.log(url.pathname); // "/cats"
The constructor will raise an exception if the URL cannot be parsed to a valid URL.
You can either call the above code in a try...catch
block or use the canParse()
static method to first check the URL is valid:
if (URL.canParse("../cats", "http://www.example.com/dogs")) {
const url = new URL("../cats", "http://www.example.com/dogs");
console.log(url.hostname); // "www.example.com"
console.log(url.pathname); // "/cats"
} else {
console.log("Invalid URL"); //Invalid URL
}
URL properties can be set to construct the URL:
url.hash = "tabby";
console.log(url.href); // "http://www.example.com/cats#tabby"
URLs are encoded according to the rules found in RFC 3986. For instance:
url.pathname = "démonstration.html";
console.log(url.href); // "http://www.example.com/d%C3%A9monstration.html"
The URLSearchParams
interface can be used to build and manipulate the URL query string.
To get the search params from the current window's URL, you can do this:
// https://some.site/?id=123
const parsedUrl = new URL(window.location.href);
console.log(parsedUrl.searchParams.get("id")); // "123"
The toString()
method of URL
just returns the value of the href
property, so the constructor can be used to normalize and encode a URL directly.
const response = await fetch(
new URL("http://www.example.com/démonstration.html"),
);
Specifications
Specification |
---|
URL Standard # url |
Browser compatibility
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