Versioning GraphQL APIs — Schema Evolution Strategies

In this tutorial, you will learn about Versioning Graphql APIs. We cover key concepts, practical examples, and best practices to help you master this topic.

GraphQL APIs approach versioning differently than REST because clients specify exactly what data they need, enabling additive schema evolution without version identifiers.

GraphQL Versioning Approach

GraphQL avoids traditional versioning because clients request specific fields. New fields can be added without breaking existing queries. Deprecated fields are marked with @deprecated directive.

Field Deprecation

type User {
  id: ID!
  name: String!
  email: String!
  oldField: String @deprecated(reason: "Use newField instead")
  newField: String
}

Common Mistakes

1. URI versioning with GraphQL — A single GraphQL endpoint should not be versioned.
2. Removing fields without deprecation — Use @deprecated directive first.
3. Versioning the schema — Evolve the schema, do not version it.

Practice Questions

1. Why does GraphQL avoid traditional versioning?
2. How do you deprecate a GraphQL field?
3. What is the recommended GraphQL versioning approach?

Challenge

Design a GraphQL schema evolution plan. Add two new fields, deprecate one old field, and explain why no version bump is needed.

What's Next

In the next lesson, you will learn versioning gRPC APIs.