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  <title>Lodash _.defaultsDeep — nested config</title>
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  <h1>_.defaultsDeep — nested config</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var userConfig = {
        theme: "dark",
        font: { size: 16 }
      };
      var defaults = {
        theme: "light",
        font: { size: 14, family: "Arial" }
      };
      _.defaultsDeep(userConfig, defaults);
      document.getElementById("out").textContent =
        JSON.stringify(userConfig, null, 2);
    })();
  </script>
</body>
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Lodash _.defaultsDeep — nested config: keep what's defined, fill what's missing (Try It)