How can you check if cookies are enabled in the browser?

You can try to set a test cookie and then read it. If reading is successful, cookies are enabled.

try {
  // Attempt to set a test cookie
  document.cookie = "testcookie=testvalue; samesite=Strict";
  // Attempt to read the test cookie
  const cookieEnabled = document.cookie.includes("testcookie=testvalue");
  // Delete the test cookie
  document.cookie = "testcookie=; expires=Thu, 01 Jan 1970 00:00:00 UTC; samesite=Strict";
  return cookieEnabled;
} catch (e) {
  // If an error occurs during setting or reading, cookies are likely disabled
  return false;
}