JSON-io
A Java serialization library that converts objects to/from JSON, JSON5, and TOON formats, handling complex graphs and reducing LLM token usage by 40-50%.
What is JSON-io?
json-io is a Java serialization library that converts Java objects to and from JSON, JSON5, and TOON formats. It solves the problem of serializing complex object graphs with cyclic references and polymorphic types, which standard libraries like Jackson and Gson cannot handle. Additionally, its TOON format reduces token usage by 40-50%, making it ideal for cost-sensitive LLM applications.
Java developers building applications that require robust object serialization, especially those working with complex data models, Spring Boot/Spring AI integrations, or LLM-powered features where token efficiency is critical.
Developers choose json-io because it handles complex serialization scenarios out-of-the-box—like cyclic graphs and polymorphism—without extensive configuration. Its TOON format offers significant token savings for LLM interactions, and it integrates seamlessly with Spring ecosystems while maintaining compatibility with existing Jackson annotations.
Overview
Convert Java to JSON/TOON and back. Supports complex object graphs, cyclic references, and TOON format for 40-50% LLM token savings
Use Cases
Best For
- Reducing LLM token costs by serializing Java objects to the compact TOON format
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