Should I use GraphQL or REST for microservices?

For microservices, the short answer is: usually REST for service-to-service communication, GraphQL for client-facing aggregation layers.

Rule of thumb

• Use REST when:

  • Services need simple, stable, cacheable endpoints
  • You want easier observability, retries, and tooling
  • Each microservice owns a clear resource/domain
  • You need straightforward inter-service communication

• Use GraphQL when:

  • A frontend or API consumer needs data from multiple services in one request
  • You want to reduce over-fetching/under-fetching
  • You have complex client data needs and many UI variations
  • You can afford the extra complexity in schema, resolvers, and performance tuning

In practice

A common architecture is:

• Microservices expose REST or gRPC
• A GraphQL API Gateway/BFF sits in front and composes data from those services

That gives you:

• simpler internal service contracts
• flexible client queries
• one optimized entry point for apps

Why not GraphQL everywhere?

GraphQL is great, but for microservices it can introduce:

• more operational complexity
• harder caching
• resolver “N+1” performance issues
• tighter coupling through a shared schema
• trickier debugging and rate limiting

Recommendation

If you’re starting a microservices system:

• Use REST (or gRPC) between services
• Add GraphQL only at the edge if clients need it

If you want, I can also give you a decision matrix or a real-world architecture example comparing REST, GraphQL, and gRPC for microservices.