Fragments for Reusable Fields

When you request the same fields in multiple places, fragments let you define them once and reuse.

fragment UserBasics on User {
  id
  name
  email
}

query {
  currentUser {
    ...UserBasics
  }
  user(id: 1) {
    ...UserBasics
    posts {
      title
    }
  }
}

The ...UserBasics spreads the fragment fields into that location. Both currentUser and user get id, name, and email.

Fragments are especially useful for:

• Reducing duplication in complex queries
• Keeping frontend components and their data needs together
• Ensuring consistent field selection

The fragment must specify what type it applies to (on User). It can only be used where that type appears.

I cover fragments and advanced query patterns in my GraphQL with Python course.