GraphQL Schema Validator
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.
How to Use the GraphQL Schema Validator
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Frequently Asked Questions
Spec compliance?
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.
Error messages useful?
Each violation cites the exact type and field path for direct fixing.
Schema vs query validation?
Schemas define the contract; queries get checked against it separately.
Is my schema uploaded anywhere?
No — validation runs locally in your browser, free with no signup.
What exactly does the validator check?
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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Last updated October 2026