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JavaScript mixed BigInt and Number in an unsupported way

TypeError: can't convert BigInt to number

JavaScript rejected an operation because BigInt and Number values were mixed in a context that requires explicit conversion.

TypeError: can't convert BigInt to numberruntime

Observed message

TypeError: can't convert BigInt to number

Why it happens

  • BigInt and Number values were mixed in one arithmetic expression.
  • An API expects Number values but received BigInt.
  • Implicit conversion was assumed where JavaScript requires explicit conversion.

How to fix it

  1. Convert values explicitly before combining BigInt and Number types.
  2. Choose one numeric representation for the operation where possible.
  3. Review library and API expectations for accepted numeric types.

Official reference

MDN: TypeError: can't convert BigInt to number

Related errors

ReferenceError: can't access lexical declaration before initializationJavaScript accessed a let or const binding before initializationReferenceError: assignment to undeclared variableJavaScript assigned to an undeclared variableTypeError: class constructors must be invoked with 'new'JavaScript class constructor was called without newRangeError: x can't be converted to BigInt because it isn't an integerJavaScript could not convert a non-integer value to BigInt

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JavaScript can't convert BigInt to number: causes and fixes | Error Atlas