jpzip
A static JSON CDN and multi-language SDKs that deliver monthly-updated Japanese postal code data.
A CDN + multi-language SDK project that normalizes the postal code dataset published by Japan Post each month and serves it as static JSON from https://jpzip.nadai.dev.
Highlights
- Static JSON CDN: served from Cloudflare Pages — no auth, CORS open to all origins, transparent gzip/brotli
- Multi-language SDKs: TypeScript, Go, Python, Rust, Ruby, Dart, PHP and Swift — 8 languages, all implementing the same protocol
- Monthly updates: follows the Japan Post release cycle, with version metadata exposed at
/meta.json - License: MIT for the spec/schema, public-domain-equivalent for the served data
Status
Protocol v1.0 was published in May 2026. The CDN is live; language SDKs are being rolled out in sequence.
Spec: jpzip/spec · CDN: jpzip.nadai.dev