GraphQL Toolkit

GraphQL Formatter cleans up a dense, single-line query, mutation, or SDL schema into readable, consistently indented GraphQL — parsed and re-printed with the real GraphQL reference parser, so a malformed document is caught with a precise line and column instead of silently mis-formatted. GraphQL Query Validator goes further: paste your schema's SDL alongside a query and it runs the same reference validator every GraphQL server uses — unknown fields, wrong argument types, missing required arguments. No schema handy? It still checks the query's own structure alone — unused variables, duplicate names, fragment cycles.