COBOL-REKT, a toolkit for analysing and reverse-engineering COBOL
This is an evolving toolkit of capabilities helpful for analysing and reverse engineering legacy Cobol code. Currently, the following capabilities are available: - Program / Section-level flowchart generation based on AST (SVG or PNG) - Parse Tree generation (with export to JSON) - Control Flow Tree generation (with export to JSON) - Allows embedding code comments as comment nodes in the graph - The SMOJOL Interpreter (WIP) - Injecting AST and Control Flow into Neo4J - Injecting Cobol data layouts from Data Division into Neo4J (with dependencies like MOVE, COMPUTE, etc.) + export to…
In plain words
COBOL-REKT is a toolkit for analyzing and reverse-engineering legacy COBOL code. It generates flowcharts, parse trees, and control flow diagrams from COBOL programs, with exports to SVG, PNG, and JSON. The toolkit can inject code structures and data layouts into Neo4J databases, includes an experimental interpreter, and integrates with GPT for automated code summarization. It is designed for developers and maintainers working with older COBOL systems.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
This is an evolving toolkit of capabilities helpful for analysing and reverse engineering legacy Cobol code. Currently, the following capabilities are available: - Program / Section-level flowchart generation based on AST (SVG or PNG) - Parse Tree generation (with export to JSON) - Control Flow Tree generation (with export to JSON) - Allows embedding code comments as comment nodes in the graph - The SMOJOL Interpreter (WIP) - Injecting AST and Control Flow into Neo4J - Injecting Cobol data layouts from Data Division into Neo4J (with dependencies like MOVE, COMPUTE, etc.) + export to JSON - Injecting execution traces from the SMOJOL interpreter into Neo4J - Integration with OpenAI GPT to summarise nodes using bottom-up node traversal (AST nodes or Data Structure nodes) - Exposes a unified model (AST, CFG, Data Structures with appropriate interconnections) which can be analysed through [JGraphT](https://jgrapht.org/), together with export to GraphML format and JSON. - Support for namespaces to allow unique addressing of (possibly same) graphs - ALPHA: Support for building Glossary of Variables from data structures using LLMs - ALPHA: Support for extracting Capability Graph from paragraphs of a program using LLMs - ALPHA: Injecting inter-program dependencies into Neo4J (with export to JSON) - ALPHA: Paragraph similarity map Contributions / use cases are welcome!
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