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JavaScript tried to serialize a circular object

TypeError: cyclic object value

JavaScript found a circular reference while attempting to serialize an object to JSON.

TypeError: cyclic object valuejson

Observed message

TypeError: cyclic object value

Why it happens

  • JSON.stringify encountered a circular reference.
  • Nested data structures point back to an ancestor object.
  • State or response objects contain linked structures that JSON cannot represent directly.

How to fix it

  1. Break or omit circular references before serializing.
  2. Use a replacer function or custom serializer that handles cycles deliberately.
  3. Inspect object graphs for parent links or self-references.

Official reference

MDN: TypeError: cyclic object value

Related errors

TypeError: BigInt value can't be serialized in JSONJavaScript BigInt value cannot be serialized in JSONSyntaxError: JSON.parse: bad parsingJavaScript JSON.parse failed because the JSON is invalidReferenceError: can't access lexical declaration before initializationJavaScript accessed a let or const binding before initializationReferenceError: assignment to undeclared variableJavaScript assigned to an undeclared variable

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JavaScript cyclic object value: causes and fixes | Error Atlas