Recursive search of complex JSON structures for a given key

recursive-search-json.js

const jsonSearch = (obj, searchKey, results = []) => {
  const r = results;

  // if this is array, iterate elements
  if (Array.isArray(obj)) {
    //console.log("- ARRAY LENGTH ", obj.length);
    for (const element of obj) {
      // console.log("-- searching array element: ");
      jsonSearch(element, searchKey, r);
    }
  } else if (
    // if this is object, iterate keys
    typeof obj === "object"
  ) {
    for (let key in obj) {
      let value = obj[key];
      // add matching key to results
      if (key === searchKey) {        
        
        // Optional: unbox array of one
        if (Array.isArray(value) && value.length === 1) value = value[0];        
        
        r.push(value);
      }

      const keyType = typeof obj[key];
      //console.log("key: ", key, " / type: ", keyType);

      // look inside objects
      if (keyType === "object") {
        //console.log("- searching inside object: ", key);
        jsonSearch(value, searchKey, r);
      }
    }
  }

  return r;
};