GraphQL

GraphQL is a query language for APIs allowing clients to request exact data needed, reducing over/under-fetching with a schema-driven approach.

It supports subscriptions for real-time updates.

Adopt GraphQL when:

• Clients need flexible data fetching.
• Reducing multiple REST endpoints.
• Building mobile apps with varying screens.
• Enabling real-time features.

Note: Use dataloaders for batching.

Implement depth limits.

Start with schema-first design.