What does adding ! after a field type in GraphQL schema mean?

easy📝 Conceptual Q11 of 15

GraphQL - Schema Definition Language (SDL)

What does adding ! after a field type in GraphQL schema mean?

AThe field is required and cannot be null

BThe field is optional and can be null

CThe field is deprecated

DThe field is a list type

Step-by-Step Solution

Solution:

Step 1: Understand the role of ! in GraphQL
In GraphQL, adding ! after a type means the field is non-nullable, so it must have a value.
Step 2: Interpret the meaning for data completeness
This means the field is required and cannot be left empty or null, ensuring data completeness.
Final Answer:
The field is required and cannot be null -> Option A
Quick Check:
Non-null ! means required = C [OK]

Quick Trick: Remember: ! means must have a value, no null allowed [OK]

Common Mistakes:

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