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JS
JavaScript error

TypeError

The JavaScript exception "BigInt value can't be serialized in JSON" occurs when a BigInt is encountered in JSON.stringify with no custom serialization method provided.

Reference entryJavaScriptFetched
This is a reference entry from MDN Web Docs. A full explanation with fixes has not been written yet.

The error messages

TypeError: Do not know how to serialize a BigInt (V8-based)
As listed by MDN Web Docs
TypeError: BigInt value can't be serialized in JSON (Firefox)
As listed by MDN Web Docs
TypeError: JSON.stringify cannot serialize BigInt. (Safari)
As listed by MDN Web Docs

Details

Category
TypeError
Severity
error
Runtime
both

Related errors

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Source: MDN Web Docs. Data fetched 2026-09-25T01:48:37.273Z.