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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>defaultsDeep — vs merge</title>
</head>
<body>
  <h1>vs merge</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var user = { a: { b: 2 } };
    var src  = { a: { b: 1, c: 3 } };
    document.getElementById("out").textContent =
      "defaultsDeep: " + JSON.stringify(_.defaultsDeep({}, user, src)) + "\n" +
      "merge:        " + JSON.stringify(_.merge({}, user, src));
  </script>
</body>
</html>

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Lodash _.defaultsDeep — vs merge (Try It)