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Showing content from https://developer.mozilla.org/docs/Web/API/URLSearchParams/toString below:

URLSearchParams: toString() method - Web APIs

URLSearchParams: toString() method

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Note: This feature is available in Web Workers.

The toString() method of the URLSearchParams interface returns a query string suitable for use in a URL.

Note: This method returns the query string without the question mark. This is different from Location.search, HTMLAnchorElement.search, and URL.search, which all include the question mark.

Syntax Parameters

None.

Return value

A string, without the question mark. Returns an empty string if no search parameters have been set. Characters in the application/x-www-form-urlencoded percent-encode set (which contains all code points except ASCII alphanumeric, *, -, ., and _) are percent-encoded, and U+0020 SPACE is encoded as +.

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

// Add a second foo parameter.
params.append("foo", 4);
console.log(params.toString()); // Prints 'foo=1&bar=2&foo=4'
Specifications Browser compatibility See also

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