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  <title>Lodash _.defaultsDeep vs _.defaults</title>
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<body>
  <h1>_.defaultsDeep vs _.defaults</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      function baseShape() {
        return { user: { name: "Guest" } };
      }
      var fillFrom = { user: { name: "Admin", role: "viewer" } };
      var shallow = _.defaults(baseShape(), fillFrom);
      var deep    = _.defaultsDeep(baseShape(), fillFrom);
      var lines = [];
      lines.push("defaults:     " + JSON.stringify(shallow));
      lines.push("defaultsDeep: " + JSON.stringify(deep));
      document.getElementById("out").textContent =
        lines.join(String.fromCharCode(10));
    })();
  </script>
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Lodash _.defaultsDeep vs _.defaults on nested data (Try It)