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URLSearchParams.keys - URL - Web documentation
method URLSearchParams.keys
URLSearchParams.keys(): IterableIterator<string>

Returns an iterator allowing to go through all keys contained in this object.

const params = new URLSearchParams([["a", "b"], ["c", "d"]]);
for (const key of params.keys()) {
  console.log(key);
}

Return Type

IterableIterator<string>