Errors like "Scripting payload too large", "You cannot return more than 250 items from a Code action", process timeouts, or high memory usage in logs. Zap step fails or is throttled.

Zapier Code steps run in AWS Lambda environment with hard limits: 6MB I/O payload (code + data), 256MB RAM max (128MB free), plan-specific timeouts (up to 2min Enterprise), and 250-item output limit for actions. Exceeding triggers errors to protect infrastructure.