Open API Validator

The tool validates API requests and responses against contractual schemas and HTTP semantics. It accepts endpoint URL, method, headers, and an optional body, and uses OpenAPI 3.x or GraphQL schemas to check structure and constraints. It operates conceptually by binding input data to a contract, optionally simulating a request, and producing a structured result that reflects schema conformance and HTTP compliance. This benefits developers, testers, and API teams by enabling early defect detection and contract enforcement. Core features include endpoint and method validation, header presence checks, body schema validation, and detailed error reporting with path and location information. It supports optional schema binding, environment overrides, and CI-friendly outputs. Unique value lies in schema-aware validation across REST and GraphQL, with deterministic error signaling and exportable results for integration into pipelines. Use cases cover API design reviews, regression testing, and onboarding new services. The tool emphasizes reproducible validation, clear conformance signals, and portable results to reduce debugging time and improve contract adherence.