GraphQL Validator
About GraphQL Validator
The GraphQL Query & Schema Syntax Validator checks GraphQL operations and SDL schemas against official GraphQL specification rules, reporting unclosed brackets, missing variable definitions, and invalid type keywords with line markers.
How to Use GraphQL Validator
Step 1
Paste your GraphQL code into the editor.
Step 2
Inspect the validation status badge (VALID / INVALID).
Step 3
Review any reported syntax error alerts.
Step 4
Click "Copy GraphQL" once validated.
Practical Use Cases for GraphQL Validator
GraphQL Pre-deployment Validation
Verify complex GraphQL queries and fragments for syntax errors before committing them to frontend codebases.
Schema Definition Linting
Validate custom type definitions, interfaces, and union schemas for compliance with the GraphQL specification.
Input & Output Examples
Catching Missing Closing Bracket in GraphQL
query { user(id: 1) { name email } (Missing outer brace)GraphQL Syntax Error: Expected "}", found <EOF> at Line 1, Column 35.
Key Features & Performance
- ✓Full validation against the official GraphQL specification grammar.
- ✓Validates queries, mutations, subscriptions, fragments, and SDL type definitions.
- ✓Reports exact line and column coordinates for syntax errors.
- ✓100% Client-Side memory execution guarantees code confidentiality.
- ✓1-Click Copy validated GraphQL.
Key Terminology & Definitions
GraphQL AST (Abstract Syntax Tree)
The hierarchical tree structure representing the syntactic components of a parsed GraphQL document.
Lexical Grammar
The formal rules defining valid tokens, identifiers, punctuation, and keywords in the GraphQL language.