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JavaScript tried to create an array with an invalid length

RangeError: invalid array length

JavaScript rejected an array length because it was negative, non-integer, or too large for the runtime.

RangeError: invalid array lengthruntime

Observed message

RangeError: invalid array length

Why it happens

  • The computed array length is negative or not an integer.
  • The requested array size exceeds engine limits.
  • Math or input bugs produced an invalid length value.

How to fix it

  1. Log and validate the array length before constructing the array.
  2. Clamp or reject invalid length values before they reach array APIs.
  3. Review calculations that derive array sizes from external input.

Official reference

MDN: RangeError: invalid array length

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 invalid array length: causes and fixes | Error Atlas