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Cloud & Security · Developer Error Resolution Lab

Fix GraphQL 'Syntax Error: Expected Name, found <EOF>' or Invalid Variable Syntax

Resolve GraphQL query parsing syntax errors caused by trailing commas or empty variables.

Triggered Error Message:

GraphQLError: Syntax Error: Expected Name, found <EOF> (or found ",")

// Valid GraphQL Query Structure:
// Note: GraphQL uses whitespace delimiters; commas are optional but trailing commas are illegal.

const GET_USER_QUERY = `
  query GetUserData($userId: ID!) {
    user(id: $userId) {
      id
      username
      email
      role
    }
  }
`;

Root Cause & Mechanism Analysis

Why does this error occur?

GraphQL specification strictly forbids trailing commas in field selections or variable lists, or empty query blocks `{}`.

Frequently Asked Questions

Why are trailing commas illegal in GraphQL?
The official GraphQL specification grammar treats commas as whitespace and does not allow terminal delimiters before closing braces.

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