GraphQL Schema & Query Validator
Validate GraphQL SDL schemas and queries with line/column error reporting and clear pass/fail summary. Free GraphQL validator by Graph Tools.
Use this free GraphQL schema and query validator to check GraphQL SDL schema definitions and query documents for syntax and semantic errors. Paste a schema to validate its type definitions, field declarations, and directive usage, or paste a query alongside a schema to validate field selection sets and argument types. Errors are reported with line and column numbers. Useful for backend developers writing GraphQL schemas, frontend developers writing queries, and QA engineers building GraphQL test suites.