Question 1

How to use GraphQL Scalars with Apollo Server?

Accepted Answer

Install the package via npm or yarn, then add the scalars to your schema by importing them and including them in typeDefs. You'll need to map the scalars in resolvers, following examples on the documentation website for specific setup steps.

Question 2

GraphQL Scalars vs writing my own custom scalars – which is better?

Accepted Answer

GraphQL Scalars is better for common use cases like email or date validation, as it provides battle-tested, optimized scalars. Writing your own is only necessary for highly specific domain logic not covered by the library, but it adds maintenance overhead.

Question 3

Does GraphQL Scalars support TypeScript?

Accepted Answer

Yes, it includes TypeScript definitions out of the box, so you get type safety when using the scalars in your GraphQL schema and resolvers. This helps catch errors during development.

Question 4

What are common validation errors with GraphQL Scalars?

Accepted Answer

Common errors include invalid email formats, malformed URLs, or non-ISO 8601 date strings, which cause GraphQL execution to fail with descriptive error messages. Ensure input data matches the scalar specifications to avoid these.

Question 5

How to handle BigInt scalars in JavaScript clients?

Accepted Answer

BigInt scalars handle integers beyond JavaScript's Number limit, but in clients, you may need to use BigInt polyfills or libraries like graphql-bigint for proper serialization, as not all environments support BigInt natively.

Question 6

Is GraphQL Scalars compatible with GraphQL Yoga or other servers?

Accepted Answer

Yes, it's framework-agnostic and works with any GraphQL server implementation, including GraphQL Yoga, Apollo Server, and Express-GraphQL, by integrating the scalars into your schema definition.

graphql-scalars

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