Unnesting response from https://www.marinespecies.org/rest/

worms.js

const data = {
  AphiaID: 1,
  rank: "Superdomain",
  scientificname: "Biota",
  child: {
    AphiaID: 2,
    rank: "Kingdom",
    scientificname: "Animalia",
    child: {
      AphiaID: 51,
      rank: "Phylum",
      scientificname: "Mollusca",
      child: {
        AphiaID: 101,
        rank: "Class",
        scientificname: "Gastropoda",
        child: {
          AphiaID: 156485,
          rank: "Subclass",
          scientificname: "Vetigastropoda",
          child: {
            AphiaID: 1052448,
            rank: "Order",
            scientificname: "Trochida",
            child: {
              AphiaID: 156489,
              rank: "Superfamily",
              scientificname: "Trochoidea",
              child: {
                AphiaID: 382180,
                rank: "Family",
                scientificname: "Calliostomatidae",
                child: {
                  AphiaID: 411630,
                  rank: "Subfamily",
                  scientificname: "Calliostomatinae",
                  child: {
                    AphiaID: 138584,
                    rank: "Genus",
                    scientificname: "Calliostoma",
                    child: null,
                  },
                },
              },
            },
          },
        },
      },
    },
  },
};

function unnestWormResponse(aphia, accumulator = {}) {
  if (!aphia) return;
  accumulator[aphia.rank] = aphia.scientificname;
  unnestWormResponse(aphia.child, accumulator);
  return accumulator;
}

const result = unnestWormResponse(data);
console.log(result);