What are Enumeration Types in GraphQL?
Enumeration types referred to as enums, are a valuable feature in GraphQL schemas. An enum is a schema in GraphQL that represents a predefined list of possible values. It allows developers to define a specific set of values that a field can have. Enums are useful when a field should only have a limited number of possible values, such as status fields (for examples: “PENDING“, “IN_PROGRESS“, “COMPLETED“) or type fields (for examples: “USER“, “ADMIN“, “GUEST“).
enum OrderStatus {
PENDING
SHIPPED
DELIVERED
CANCELLED
}
In this example, OrderStatus is an enum type with four possible values: PENDING, SHIPPED, DELIVERED, and CANCELLED.
Enumeration Types in GraphQL Schema
In the area of GraphQL schema design, enumeration types play an important role in defining a structured set of values for specific fields. Enumerations serve as a means to restrict the possible options for a field, ensuring data consistency and clarity throughout an API. In this article, we will explore the concept of enumeration types in GraphQL with their importance through practical examples and use cases.
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