Batch resolvers

Batch resolvers group many field resolutions into a single call so servers avoid N+1 database or service requests while preserving GraphQL’s shape.

Practices implemented

• Batched execution

Applies to

• GraphQL servers
• Execution engines and runtimes

Configuration (suggested defaults)

Parameter	Default	Notes
batchSchedule	microtask	Queue batching within the same tick.
cacheScope	perRequest	Avoid cross-request caching by default.

Implementation notes

• Resolver signature should accept a list of parent objects.
• Preserve positional ordering between inputs and outputs.
• Return null or errors for missing items without reordering.
• Prefer request-scoped caching for de-duplication within the same operation.

Cautions

• Cross-request caches can leak data if not keyed by auth context.
• Make batch failures granular; avoid failing the entire batch when possible.
• Batching can increase end-to-end latency by expanding the critical path.

Problems addressed

• N+1 queries