Deterministic API for JSON ↔ Zengin banking files | Zengin-Modern Gateway API

Zengin-Modern Gateway API is a deterministic API for Japanese banking file workflows. It generates CP932 (Shift-JIS) 120-byte fixed-length Zengin records from JSON, parses records back into JSON, validates file correctness, and returns lint warnings before submission. Built for teams that want strict, explicit validation without rebuilding fragile banking file logic in every internal batch or backend system.

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I built Zengin-Modern Gateway API because Japanese banking file workflows are still harder than they should be. In practice, teams often end up reimplementing the same fragile logic for CP932 / Shift-JIS handling, 120-byte fixed-length records, padding rules, and file validation across internal batch jobs and finance tooling. I wanted a deterministic, stateless API that could centralize that work instead of spreading it across multiple systems. The API currently supports: - generate: JSON -> Zengin fixed-length records - parse: Zengin fixed-length records -> JSON - validate: strict pre-submission checks - lint: warnings before final generation It is now live on RapidAPI and also has a public project site. I’d especially appreciate feedback from people who have worked with banking files, fixed-width records, ERP integrations, or encoding-heavy legacy workflows.

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