Detect circular dependency in object

circularDependencyDetector.js

const circularDepDetector = (function () {
  const set = new Set();
  return function(key, value) {
    if (set.has(value)) {
      return 'CIRCULAR DEPENDENCY';
    }
    set.add(value);
    return value;
  };
})();

const o = { toto: 42 };
const p = { o };
o.p = p;
JSON.stringify(p, circularDepDetector);