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Getting Started with GraphQL using Node.js

Schema with Lists and Non-Null

Explore how to apply list and non-null modifiers within GraphQL schemas to control data validation and response types. Understand the impact of these modifiers on queries and mutations to ensure precise API functionality.

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The only types we can define in GraphQL are object, scalars, and enums. But when we use the non-null modifier in our query or fields, we can also register additional type modifiers that affect the validation of the values. Let’s look at an example:

Javascript (babel-node)
  type Pizza {
    id: Int!
    pizza: String!
    stock: Int!
    toppings: [Topping!]!
  }

Non-null modifier type

In the example above, pizza is a field with a String type. If we mark it as non-null by adding an exclamation mark (!) after the type name, our server will return a non-null value. If, for some ...