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JavaScript string repeat count was negative

RangeError: repeat count must be non-negative

JavaScript rejected a string repeat operation because the repeat count was negative.

RangeError: repeat count must be non-negativeruntime

Observed message

RangeError: repeat count must be non-negative

Why it happens

  • String.repeat received a negative number.
  • Math or parsing logic produced a negative count unexpectedly.
  • User-controlled input was passed into repeat() without validation.

How to fix it

  1. Check that repeat counts are zero or greater before calling repeat().
  2. Normalize or reject invalid user input that can become negative.
  3. Review numeric transformations that might flip the sign of the repeat count.

Official reference

MDN: RangeError: repeat count must be non-negative

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 repeat count must be non-negative | Error Atlas