The has() method of the URLSearchParams interface returns a boolean value that indicates whether the specified parameter is in the search parameters.

A parameter name and optional value are used to match parameters. If only a parameter name is specified, then the method will return true if any parameters in the query string match the name, and false otherwise. If both a parameter name and value are specified, then the method will return true if a parameter matches both the name and value.

name

The name of the parameter to match.

value

The value of the parameter, along with the given name, to match.

A boolean value.

This example shows how to check if the query string has any parameters with a particular name.

const url = new URL("https://example.com?foo=1&bar=2&foo=3");
const params = new URLSearchParams(url.search);

// has() returns true if the parameter is in the query string
log(`bar?:\t${params.has("bar")}`);
log(`bark?:\t${params.has("bark")}`);
log(`foo?:\t${params.has("foo")}`);

The log below shows whether the parameters bar, bark, and foo, are present in the query string.

This example shows how to check whether the query string has a parameter that matches both a particular name and value.

const url = new URL("https://example.com?foo=1&bar=2&foo=3");
const params = new URLSearchParams(url.search);

// has() returns true if a parameter with the matching name and value is in the query string
log(`bar=1?:\t${params.has("bar", "1")}`);
log(`bar=2?:\t${params.has("bar", "2")}`);
log(`foo=4?:\t${params.has("foo", "4")}`);

Only the second value above should be true, as only the parameter name bar with value 2 is matched.

If your browser does not support the value option the method will match on the name, and all the results should be true.

• Polyfill of URLSearchParams in core-js