Validate GraphQL schema syntax and structure. Detect missing root types, unknown type references, and common schema issues. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
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Partially — the check covers root-type presence and unknown type references only. It never parses the schema, so directives, interfaces, field-type mismatches, and full spec rules are not verified. For full validation, use a dedicated GraphQL validator.
Each violation cites the exact type and field path for direct fixing.
Schemas define the contract; queries get checked against it separately.
No — validation runs locally in your browser, free with no signup.
Three things only: at least one type definition exists, a type Query root exists, and every referenced type longer than 1 character is defined. $variables and words followed by : or ( (field/argument names like users: or user() are skipped, so they never misfire as unknown types.
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Convert GraphQL schema definitions to JSON Schema format. Bridge the gap between GraphQL and REST tooling ecosystems. Types map with validation preserved — free, local, no signup.
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Test GraphQL queries with variables. Format queries and variables, and preview formatted responses for development and debugging.