Kyonta expanded geographic data coverage for Japan in the osmlab/name-suggestion-index repository by creating a comprehensive set of regional GeoJSON files and updating project documentation. Focusing on data visualization and geospatial data handling, Kyonta modeled and batch-generated GeoJSON files representing key Japanese regions such as Kanto, Chubu, Hokuriku, Kansai, Shikoku, and Kyushu. This work enhanced the accuracy of location-based search and autocompletion for Japanese locales, addressing previous data gaps. The contribution included cohesive documentation updates to support onboarding and future development. Kyonta’s approach demonstrated proficiency in JSON, collaborative Git workflows, and systematic geospatial data modeling within a single feature release.