HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasPrivateToken errors</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn" type="button">Try invalid issuer</button>
  <pre id="out">Click the button</pre>
  <script>
    async function safeHasToken(issuer) {
      if (typeof document.hasPrivateToken !== "function") {
        return { ok: false, reason: "unsupported" };
      }
      try {
        var hasToken = await document.hasPrivateToken(issuer);
        return { ok: true, hasToken: hasToken };
      } catch (err) {
        return { ok: false, reason: err.name, message: err.message };
      }
    }
    document.getElementById("btn").addEventListener("click", async function () {
      var result = await safeHasToken("not-a-url");
      document.getElementById("out").textContent = JSON.stringify(result, null, 2);
    });
  </script>
</body>
</html>

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Document.hasPrivateToken — handle errors (Try It)