Validation timeouts

Stops validation when it exceeds a time budget.

Practices implemented

• Operation cost controls

Applies to

• GraphQL servers
• Gateways and proxies

Configuration (suggested defaults)

Parameter	Default	Notes
validationTimeoutMs	250	Abort validation after a time budget.
fallbackBehavior	reject	Reject queries that exceed the timeout.

Implementation notes

• Enforce timeouts during validation, before execution starts.
• Surface clear errors that point to validation cost.
• Keep validation rules deterministic.
• Hashing operations and storing them in a "known good" list once validated can save repeated validation costs.

Cautions

• Complex schemas may require higher timeouts.
• Timeouts can hide performance regressions if not monitored.
• Frequent validation timeouts from the same user or IP might indicate a malicious user. Consider rate-limiting new operations.

Problems addressed

• DoS via validation