30-seconds-of-code/snippets/circularJSONStringify.md

title, tags

title	tags
circularJSONStringify	object,intermediate

Serializes valid JSON objects containing circular references into a JSON format.

• Use JSON.stringify with a custom replacer
• ⚠️ NOTICE: This function finds and removes circular references, what causes data loss

const circularJSONStringify = object => {
  const cache = new WeakSet();
  return JSON.stringify(object, (key, value) => {
    if (value !== null && typeof value === 'object') {
      if (cache.has(value)) return;

      cache.add(value);
    }
    return value;
  });
};

const obj = { n: 42 };
obj.obj = obj;

circularJSONStringify(obj); // '{"n": 42}'