Definition

Scalars are the primitive data types in GraphQL.

They represent leaf values that cannot be further queried.

Built-in Scalars

GraphQL provides the following default scalar types:

• Int → 32-bit integer
• Float → floating-point number
• String → text
• Boolean → true/false
• ID → unique identifier (usually serialized as string)

Example

type User {
  id: ID!
  name: String!
  age: Int
  isActive: Boolean!
}

• id, name, age, isActive are scalar fields
• These fields return direct values (not objects)

Usage in Queries

query {
  user {
    id
    name
    isActive
  }
}

Response: