RangeError: Invalid array length
An array was created or resized with a negative, fractional or enormous length.
Seen on:
JavaScript
Meaning
new Array(n) with n negative/NaN, or array.length set to an invalid value. Often n comes from a failed calculation.
Common causes
- new Array(-1) or new Array(NaN)
- Length from a bad calculation or input
- Infinite loop pushing until memory limits
⚡ Quick fix
- Validate n is a non-negative integer
- Use Array.from({ length: n })
Detailed fix by platform
JavaScript
- `const n = Math.max(0, Math.floor(count)
- 0); const rows = Array.from({ length: n }, () => []);`
How to diagnose
- Value — What length was requested?
- Recent change — Did it start after a deploy, upgrade, or configuration change? Compare with the last working version.
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Last updated 2 Oct 2026