Custom Scalar Fields
- Custom scalar fields represents custom-defined scalar types that are not available in GraphQL.
- Developers can define custom scalar types which can be used to represent specialized data format,such as dates.
- Examples of Custom Scalar Fields in GraphQL are shown below:
scalar Date
type Article {
id: ID!
title: String!
datepublished: Date!
}
Explanation:
- In this above example, a custom scalar type called `Date`.
- The `scalar` keyword is used to declare a custom scalar type in GraphQL.
- The `Date` scalar type represents date in specific format, which can either be a string or a custom serialized format.
- The object Article, has three fields: `id`,`title`,`datepublished`.
- The `id` field is of type `ID` and the `title` field is of type `String` both the fields are marked with exclamation mark representing that they are required field.
- The `datepublished` field is of type `Date`, indicating it’s required field with a non -null value and it should be of custom scalar type `Date`. Using a custom scalar type developers can ensure that the `datepublished` is of the format that meet the requirement of the application.
Fields in GraphQL
Fields in GraphQL are the fundamental components that allow clients to specify the data they need from a server. They represent individual pieces of data that can be requested for an object. Understanding how fields work is essential for building efficient GraphQL queries and designing effective schemas.
In this article, We will learn about what are Fields, their different types with examples, and so on.