GQL Inspector

GQL Inspector provides a non-destructive, schema-focused analysis workflow for GraphQL APIs. It accepts SDL text or remote introspection results and builds an AST-based representation of the schema, including types, fields, arguments, and directives. It computes diffs between two schemas, highlights deprecated elements, and estimates query complexity to help teams plan migrations and gate changes in CI pipelines. The tool outputs structured results suitable for human review and automated tooling, such as JSON diffs, Markdown reports, and exportable schemas. By separating input methods (SDL vs. introspection) and enforcing GraphQL spec constraints, it ensures consistent analysis across environments. Analysts can validate field presence, type compatibility, argument requirements, and exposure of sensitive fields, enabling safer API evolution. The difference engine is designed to be source-agnostic, so teams can compare a local SDL draft with a live endpoint or compare two endpoint schemas. Use cases include migration planning, deprecation tracking, performance hinting, and QA verification. The tool is designed for developers, QA engineers, and DevOps practitioners who integrate GraphQL checks into pipelines and collaboration workflows. Its unique differentiators include dual input paths, non-destructive diff reporting, and CI-friendly export formats, which reduce review cycles and risk when evolving a GraphQL API.