jpzip blog (en) https://jpzip.nadai.dev/en/blog/ Notes on jpzip — Cloudflare Pages design, MCP servers, AI-assisted development, and indie OSS. en Sun, 17 May 2026 00:00:00 GMT How Claude Code shipped 8 language SDKs in 6 hours https://jpzip.nadai.dev/en/blog/0004-claude-code-8-sdks-6-hours/ https://jpzip.nadai.dev/en/blog/0004-claude-code-8-sdks-6-hours/ Sun, 17 May 2026 00:00:00 GMT How I shipped Go / TypeScript / Python / Rust / Ruby / Dart / PHP / Swift SDKs for jpzip in 6 hours using Claude Code — spec-first design, Go as the reference implementation, translation-not-transpilation prompting, and per-language gotchas. Claude Code AI SDK multi-language OSS How I serve 120,677 Japanese postcodes from Cloudflare Pages (no Worker, no R2) https://jpzip.nadai.dev/en/blog/0002-cloudflare-pages-static-zipcode-delivery/ https://jpzip.nadai.dev/en/blog/0002-cloudflare-pages-static-zipcode-delivery/ Sun, 17 May 2026 00:00:00 GMT The data-delivery design behind jpzip — shard layout, ETL pipeline, and why I deliberately use no Worker, no R2, no KV. Cloudflare CDN ETL Go I built a postcode-data micro-SaaS on Cloudflare Pages' free tier (and it costs me $0) https://jpzip.nadai.dev/en/blog/0001-cloudflare-pages-micro-saas/ https://jpzip.nadai.dev/en/blog/0001-cloudflare-pages-micro-saas/ Sun, 17 May 2026 00:00:00 GMT The story behind jpzip, a one-person side project, and why it stays free forever — not by luck, but by design. 120,677 Japanese postcodes served from Cloudflare Pages alone. Cloudflare OSS indie micro-SaaS I wrote an MCP server so Claude can natively look up Japanese postcodes https://jpzip.nadai.dev/en/blog/0003-mcp-server-japanese-postcode/ https://jpzip.nadai.dev/en/blog/0003-mcp-server-japanese-postcode/ Sun, 17 May 2026 00:00:00 GMT A tiny stateless MCP server that lets Claude resolve Japanese postcodes — tool design, cache lifetimes, cross-script (kanji/katakana/romaji) search. MCP Claude TypeScript AI