Show HN: Nihonpost – I parsed Japan Post's KEN_ALL.CSV so you don't have to

Category: library

Tags: postal-code, japan, vue

Score: 6.3/10 (Innovation: 5, Technical: 6, Documentation: 8, Utility: 6)

Nihonpost is a TypeScript-first Vue 3 library that provides offline, self-hostable Japanese postal code to address lookup by parsing and chunking Japan Post's KEN_ALL data. Its interesting approach includes zero-config CDN fallback, automatic monthly data updates via CI, and a composable API that handles input normalization and edge cases like shared postal codes.

Target audience: frontend devs

Repository: https://github.com/Thiya11/nihonpost · TypeScript · MIT · 1 stars

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