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Why does GraphQL require variables to be declared with types in queries?

hard📝 Conceptual Q10 of 15
GraphQL - Queries
Why does GraphQL require variables to be declared with types in queries?
ATo store variables permanently in the database
BTo validate inputs and ensure correct data types before execution
CTo allow variables to be used without passing values
DTo automatically generate UI forms
Step-by-Step Solution
Solution:

  1. Step 1: Understand the purpose of type declarations for variables

    Types help GraphQL check that inputs match expected formats before running queries.

  2. Step 2: Evaluate options

    Only To validate inputs and ensure correct data types before execution correctly explains this validation purpose.

  3. Final Answer:

    To validate inputs and ensure correct data types before execution -> Option B

  4. Quick Check:

    Type declarations enable input validation [OK]
Quick Trick: Types validate variable inputs before query runs [OK]
Common Mistakes:
  • Thinking variables store data
  • Assuming variables work without values
  • Confusing types with UI generation

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