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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>toWellFormed repair</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var raw = "Hi \uD800 there";
    var safe = raw.toWellFormed();
    document.getElementById("out").textContent = [
      "raw.isWellFormed()  = " + raw.isWellFormed(),
      "safe.isWellFormed() = " + safe.isWellFormed(),
      "safe = " + safe,
      "encodeURI(safe) = " + encodeURI(safe)
    ].join("\n");
  </script>
</body>
</html>

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String.isWellFormed() — repair with toWellFormed (Try It)