GitHub Repository

jiken - Where 地 (ji/land) meets 検証 (kensho/verification). Verify land values with official data from Japan's MLIT.

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Jiken – A zero-dependency Python client for real estate transaction API

Name: Jiken – A zero-dependency Python client for real estate transaction API
Availability: InStock
Author: Undecided9226

by Undecided9226·Feb 26, 2026·3 points·0 comments

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AI Analysis

●●SolidNiche GemShip It

Clean wrapper around Japan's real estate API—solves a real friction point for a specific market.

Strengths

•Zero-dependency design means no supply-chain risk or version conflicts
•Type-safe interface with bilingual support reduces boilerplate for Japanese market data access
•Comprehensive test coverage and documented API key workflow show production intent

Weaknesses

•Audience is extremely niche—Japan real estate developers only
•No evidence of adoption or real-world usage examples beyond the README map notebook

Post Description

I built jiken, a Python library for accessing real estate transaction data from Japan's Ministry of Land (MLIT).Japan's government publishes detailed real estate transaction records through a public API, but working with it directly can be cumbersome. Jiken wraps it in a clean, type-safe interface with zero external dependencies – just the Python standard library.Would love feedback on the API design and any feature requests.