[Solved] If a GraphQL schema defines a mutation like:type Mutation { addUser(name: String!): User }What will happen if a client sends a mutation without the "name" argument? | GraphQL

GraphQL - Schema Definition Language (SDL)

If a GraphQL schema defines a mutation like:

type Mutation { addUser(name: String!): User }

What will happen if a client sends a mutation without the "name" argument?

AThe server ignores the mutation silently

BThe server returns an error about missing required argument

CThe mutation runs with a null name

DThe mutation adds a user with an empty string name

Step-by-Step Solution

Solution:

Step 1: Understand the meaning of 'String!'
The exclamation mark means the 'name' argument is required and cannot be null.
Step 2: Predict server behavior on missing required argument
If the client omits 'name', the server will reject the mutation with an error.
Final Answer:
The server returns an error about missing required argument -> Option B
Quick Check:
Required argument missing causes error = C [OK]

Quick Trick: Exclamation mark means argument is required [OK]

Common Mistakes:

Master "Schema Definition Language (SDL)" in GraphQL

9 interactive learning modes - each teaches the same concept differently

More GraphQL Quizzes

If a GraphQL schema defines a mutation like: