Question 1

How to add a custom validation format with graphql-constraint-directive?

Accepted Answer

Define custom formats by passing a formats object to plugin options—create a function that validates the format and reference it in the @constraint directive, as shown in the Custom Format section. This allows extending validation for specialized use cases like custom string patterns.

Question 2

graphql-constraint-directive vs class-validator for GraphQL: which is better?

Accepted Answer

graphql-constraint-directive is ideal for schema-first, declarative validation integrated directly into GraphQL execution, reducing resolver boilerplate. class-validator is more general-purpose and better for complex business logic, but requires manual integration. Choose based on whether you prefer validation co-located with your schema or in application code.

Question 3

Can I use graphql-constraint-directive with Apollo Federation?

Accepted Answer

Yes, the README includes an example for Apollo 4 Subgraph server using buildSubgraphSchema, making it compatible with Federation setups. Ensure you use the Apollo 4 plugin and follow the subgraph configuration steps provided.

Question 4

How does error handling work in Apollo Server 4 with this directive?

Accepted Answer

In Apollo 4, validation errors throw a GraphQLError with extensions.code set to BAD_USER_INPUT and HTTP status 400. Detailed errors are stored in extensions.validationErrors, so you may need to parse this for client-side feedback, as described in the error handling section.

Question 5

Is graphql-constraint-directive compatible with GraphQL Yoga?

Accepted Answer

Yes, it works with GraphQL Yoga via the Envelop plugin. The README shows how to use createEnvelopQueryValidationPlugin in a Yoga setup, ensuring validation is applied during the execute phase without schema modifications.

Question 6

What are the performance implications of using the schema wrapper?

Accepted Answer

The schema wrapper adds validation by wrapping scalars, which can introduce minor overhead compared to plugins, but it's generally negligible for most APIs. For performance-critical applications, consider using server plugins to avoid schema changes and reduce execution time.

GraphQL Constraint Directive

What is GraphQL Constraint Directive?

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