JSON Generator from Java

This tool converts Java class definitions into JSON representations by analyzing source code text or uploaded source files. It extracts class names, field names, primitive types, and common collection types to produce a structured JSON object or array that mirrors the domain model. The output is suitable for API contracts, data transfer objects, test fixtures, or configuration samples. It emphasizes accuracy of basic types and structure while remaining agnostic to project conventions.
Under the hood, it builds a model of each class and its relationships, mapping Java primitives (int, long, double, boolean, String) to JSON primitives; lists and arrays to JSON arrays; and nested classes to nested objects. It can optionally emit a JSON Schema fragment that describes required fields, types, and basic constraints. The approach aims for deterministic outputs across inputs with consistent naming.
Audience includes backend engineers, API designers, data engineers, testers, and integration specialists who need fast, repeatable data contracts. The tool reduces manual writing, helps enforce consistency between client and server models, and accelerates scaffolding for services, mocks, and documentation across teams and environments. It supports common Java patterns and works with typical project structures.
Core features include multi-class support, optional nullability hints, handling of nested and generic-like structures with reasonable approximations, and straightforward copy/export options. It is designed to support rapid iteration during design reviews, integration planning, and API scaffolding. Outputs can be integrated into CI pipelines, mocked in tests, or exported for documentation and data modeling.