Validating Mutation Input Arguments
Learn how to validate incoming mutation arguments in a Spring Boot GraphQL API using Bean Validation, ensuring only clean, well-formed data reaches your data layer.
Why Validate Mutation Input?
Mutations change your data, so the arguments they receive must be trustworthy. Without validation, clients could send empty names, negative prices, or malformed emails straight into your database.
Input validation rejects bad data early and returns a clear error before any persistence happens.
Validation in the GraphQL Lifecycle
GraphQL already validates the shape of your input against the schema (types, required fields). But it does not check business rules like 'price must be positive'.
That semantic layer is your responsibility, and Spring's Bean Validation fits perfectly here.
All lessons in this course
- Understanding GraphQL Mutations
- Creating Data with Mutations
- Updating and Deleting Data
- Validating Mutation Input Arguments