Search for nested values in a JS object

nested_search.js

function search(obj, string) {
  const maxDepth = 10;
  const excludeKeys = ["_root"];

  function isObject(val) {
    return typeof val === "function" || typeof val === "object";
  }

  function traverse(obj, depth, path) {
    // Guard clause
    if (depth > maxDepth) {
      return;
    }

    if (obj === null) {
      // Helps simplify object checking
      return;
    } else if (isObject(obj)) {
      // Handle objects
      for ([key, value] of Object.entries(obj)) {
        if (excludeKeys.includes(key)) {
          continue;
        }
        traverse(value, depth + 1, path.concat(key));
      }
    } else if (Array.isArray(obj)) {
      // Handle arrays
      obj.forEach((item, index) => {
        traverse(item, depth + 1, path.concat(index));
      });
    } else {
      // Handle primitive data types
      if (String(obj).includes(string)) {
        console.log(`${path.join(".")}: ${obj}`);
      }
    }
  }

  traverse(obj, 0, []);
}

// Example usage:
const obj = {
  key1: "value1",
  nested: {
    key2: "needle here",
    key3: 42,
    deeper: {
      key4: "still going",
      more: {
        key5: "needle again",
        evenDeeper: {
          key6: "deepest needle",
        },
      },
    },
  },
  array: [1, "needle", { key7: "value7" }],
};

search(obj, "needle");

// Expected Output
// nested.key2: needle here
// nested.deeper.more.key5: needle again
// nested.deeper.more.evenDeeper.key6: deepest needle
// array.1: needle