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Getting Started with GraphQL using Node.js

Schema with Object Types and Fields

Explore how to build GraphQL schemas focusing on object types and fields. Understand the role of Apollo Server in setting up a GraphQL API, creating type definitions, resolvers, and running queries. This lesson guides you through a practical hands-on implementation of a GraphQL server using Node.js.

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GraphQL object types and fields

Object types are the building blocks of GraphQL schema. They reflect available objects and fields from our server. Let’s check out our first GraphQL schema language.

JavaScript (JSX)
    type Pizza {
      id: Int!
      pizza: String!
      stock: Int!
      toppings: [Topping!]!
    }
    type Topping {
      id: Int!
      topping: String!
    }

  • Pizza is a GraphQL Object Type, which means that it’s a type with some fields. We’ll be dealing with object types the most.

  • id, name, stock, and toppings are fields on the Pizza type. These are the fields that are allowed to appear in a GraphQL query that operates on the Pizza type.

  • Int and String are the built-in scalar types in GraphQL. These are types that resolve to a scalar value and can’t have sub-selections in the query. We’ll go over scalar types later.

  • String! means that the field is non-nullable, meaning that the GraphQL service promises to always give us a value when we query this field. In the type language, we’ll represent this with an exclamation mark (!).

  • [Topping!]! ...