JSON Schema Validator

The tool validates a JSON document against a JSON Schema using the nlohmann json-schema-validator approach. It accepts schema and instance inputs and returns a boolean validity result along with a structured list of errors that includes the JSON Pointer path, the failing keyword, descriptive messages, and constraint parameters. Conceptually, validation proceeds by parsing the inputs, resolving any $ref references, and applying keyword rules to each value in the data, with recursive descent through objects and arrays. The core value is accurate conformance reporting, enabling precise fixes. Target users are backend engineers, API developers, and data teams who enforce API contracts and data contracts across development, testing, and CI workflows. Unique value lies in its combination of robust reference resolution, support for common Drafts and schema constructs, and rich, path-aware error reporting suitable for automation. Core features include type checks, required properties, enums, numeric and string constraints, array and object validations, combinators (allOf/anyOf/oneOf), and options for draft version selection and custom formats. Use cases include validating request payloads, validating responses, contract testing, and CI validations. Core capabilities are complemented by clear error paths and structured outputs that integrate with tooling pipelines and dashboards. Use cases span API gateways, data pipelines, and microservice architectures where schema governance reduces runtime faults and expedites debugging.