RPG Engineering Platform
Live Demo • VS Code • OpenAPI 3.0 • IBM i RPG

OpenAPI ↔ RPG Round-trip

RPGTools closes a long-standing gap in the IBM i modernization ecosystem: a Design-First workflow where OpenAPI specs and RPG source stay in sync, automatically, bidirectionally, with 96% round-trip fidelity and zero runtime dependency.

What this demo shows

1, Import & Generate

Open pet-store.yaml (OpenAPI 3.0.4, 19 operations, 6 schemas). RPGTools renders a live Swagger UI panel instantly, no server required. Generate pet_store.rpgle: 1,529 lines, 19 procedures, 6 structures, fully annotated with OpenAPI metadata.

2, Navigate & Edit

The RPG Structure panel detects 19 REST endpoints, 21 constants and 6 data structures automatically. Navigate to Pet_t, add a new field with metadata annotations (@#type, @#minLength), directly in RPG source.

3, Auto-sync & Validate

Ctrl+S triggers automatic synchronization. The new field propagates to pet-store.yaml with minLength: 1 preserved. Validation runs instantly, 0 errors, all consistency checks passed.

Key figures

This fidelity holds even when RPG source can't be touched, see how the sidecar enrichment mechanism works.

96%
Round-trip fidelity
RPG→Swagger→RPG
0
Runtime dependencies
19
Operations preserved
44
Validation codes
4,900+
Automated tests
95%
OpenAPI 3.0.3 coverage
82 features audited, 63 full, 15 partial

Strategic Acquisition Opportunity

RPGTools is available for full intellectual property transfer, source code, VS Code extension, test suite and documentation included.

This production-ready asset gives any IBM i software vendor or platform provider an immediate, proven foundation for API modernization tooling, without building from scratch.

What transfers
  • Core Python engine (parsing + generation)
  • VS Code extension (TypeScript)
  • Flask web interface
  • CLI (rpgtools)
  • 4,900+ automated tests
  • Full documentation
Why this accelerates your roadmap
  • Enables contract-first API development on IBM i
  • Prevents contract drift between RPG and OpenAPI
  • Bridges IBM i legacy code to modern API toolchains
  • No runtime dependency, embeds cleanly into any product
Asset state
  • 90% unit test coverage
  • OpenAPI 3.0.3 audited (82 features)
  • Python 3.14, zero deprecated dependencies
  • Full technical dossier available under NDA

Build vs. Buy

What it takes to reach this point from scratch.

Building internally

  • RPG parser, free-form + fixed-format, SQLRPGLE, includes
  • OpenAPI 3.0.3 generator & reverse converter
  • VS Code extension (diagnostics, hover, completion, code actions)
  • Validation framework (44 codes, 4 severity levels)
  • CLI, web interface, enterprise config system
  • 4,900+ automated tests, i18n (5 languages)
  • Documentation, packaging, VSIX distribution

Realistic estimate: 18–24 months of dedicated senior engineering, IBM i domain expertise required throughout.

Acquiring RPGTools

  • Production-ready engine, day one
  • Full source code, no black box
  • Existing test suite validates every change
  • Documented architecture, zero hidden dependencies
  • OpenAPI 3.0.3 audited across 82 features
  • Transfer includes onboarding support
  • Immediate integration into your existing product

Time to integration: weeks, not months. Your team builds on top of a proven foundation, not around an unknown parser.

Start the conversation

A 20-minute call is usually enough to assess strategic fit.

Request the technical dossier

Available under NDA: architecture overview, IP state, OpenAPI coverage matrix, test coverage report, and transfer terms.

Contact CoreStratos

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