[Solved] Find the mistake in this GraphQL query:query fetchProduct($productId: ID!) { product(id: productId) { name price } } | GraphQL

GraphQL - Queries

Find the mistake in this GraphQL query:

query fetchProduct($productId: ID!) { product(id: productId) { name price } }

AThe variable type ID! should be ID without exclamation mark

BThe variable $productId is not referenced correctly inside the query

CThe query name fetchProduct is missing a required directive

DThe fields name and price cannot be queried together

Step-by-Step Solution

Solution:

Step 1: Analyze variable usage
The variable declared is $productId, but inside the query it is used as productId without the $ prefix.
Step 2: Check other options
The variable type ID! should be ID without exclamation mark is incorrect because ID! is a valid non-null type. The query name fetchProduct is missing a required directive and D are unrelated to variable usage.
Final Answer:
The variable $productId is not referenced correctly inside the query -> Option B
Quick Check:
Variables must be referenced with $ inside queries [OK]

Quick Trick: Always prefix variables with $ inside query fields [OK]

Common Mistakes:

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