GraphQL validation using directives

GraphQL validation using directives

Using this approach, it’s trivial to create your own custom directives to validate and manipulate field values. You can look at the code of graphql-constraint-directive as an example!

This is a guest post by [James Mortemore], who is a software engineer at [YLD]. He has an extensive background in API development & enterprise integration architecture.

Out of the box, GraphQL supports validating your inputs based on type information. For example, you can ensure that an argument is a particular scalar type, such as String or Int. You can also enforce the shape of object arguments using input object types. While this prevents a large class of possible errors, this doesn’t cater to more complex validation needs like enforcing the length of a string, or the size of a number.

graphql graphql directives validate

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