NonNull Fields
- Non-null fields represent fields that must always have a non-null value. They are denoted by an exclamation mark (!) after the type defination of the field.
- They ensure that the data returned by the object for this field should always have a value.
- If any user try to attempt to query a non-null field without providing a value for it, GraphQL will return an error which would indicate that a field is missing.
- Examples of NonNull Fields in GraphQL are shown below:
type Author{
id:ID!
name: String!
email: String!
}
Explanation: In the above example, the fields of the object `Author` are all marked with an exclamation mark (!) which means all the three fields , `id`,`name`,`email` are required for the object Author so that the above Schema should be error free.
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.
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