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JavaScript BigInt value cannot be serialized in JSON

TypeError: BigInt value can't be serialized in JSON

JavaScript failed to stringify data because JSON does not support BigInt values directly.

TypeError: BigInt value can't be serialized in JSONjson

Observed message

TypeError: BigInt value can't be serialized in JSON

Why it happens

  • JSON.stringify encountered a BigInt value.
  • A data structure contains BigInt fields that were not normalized for JSON output.
  • A response or storage layer assumes JSON can handle BigInt directly.

How to fix it

  1. Convert BigInt values to strings or another supported representation before serialization.
  2. Use a replacer function with JSON.stringify if conversion must happen centrally.
  3. Check API contracts and persistence layers for BigInt compatibility.

Official reference

MDN: TypeError: BigInt value can't be serialized in JSON

Related errors

SyntaxError: JSON.parse: bad parsingJavaScript JSON.parse failed because the JSON is invalidTypeError: cyclic object valueJavaScript tried to serialize a circular objectReferenceError: 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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