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Tokyo Developer Builds Vue 3 npm Package for Japanese Postal Code Lookups

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A full-stack engineer based in Tokyo created and published an open-source npm package called nihonpost after failing to find a suitable library for Japanese postal code address auto-fill. Existing packages on npm lacked TypeScript support, proper documentation, or Vue 3 compatibility. The package is built TypeScript-first, includes a Vue 3 composable, and requires no third-party API — instead, users self-host postal data split into prefix-based JSON chunks that are fetched on demand and cached. A single configuration call at startup is all that is needed before the lookup function can resolve a postal code into prefecture, city, and town fields. The package is now publicly available on npm, and the developer is welcoming issues and pull requests from the community.

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