Added circularJSONStringify snippet

snippets/circularJSONStringify.md

@@ -0,0 +1,30 @@
+---
+title: circularJSONStringify
+tags: 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
+
+```js
+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;
+  });
+};
+```
+
+```js
+const obj = { n: 42 };
+obj.obj = obj;
+
+circularJSONStringify(obj); // '{"n": 42}'
+```