Group Partner Healthtech & CTO Theodo France

Learn how AI and an AST parser mapped a 500k+ Express monolith to a modular Hono architecture, producing 6000 nodes visualized with Neo4j.

Overview

“From Monolith to Modular Architecture: Mapping 500k+ LoC with AI and Graphs”

Problem statement : To migrate a complex legacy application (here a monolith in Express to a modular architecture in Hono) we need to map all the existing code to a target architecture (e.g. Controller -> Service -> Model). Because static code analysis alone often fails to capture implicit logic, dynamic routing, or unconventional patterns, manual inspection is typically required—making the mapping process both time-consuming and resource-intensive. By using GenAIScript in combination with an AST parser, we managed to map the whole codebase in 1 hour instead of days, resulting in 6000 nodes that can be visualised with Neo4J.

Tech stack