Fetch API & Handling JSON Responses

What functionality does this code implement?
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), 5000);

try {
  const response = await fetch(url, {
    signal: controller.signal
  });
  clearTimeout(timeoutId);
  return await response.json();
} catch (error) {
  if (error.name === 'AbortError') {
    throw new Error('Request timed out');
  }
  throw error;
}
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