StationAPI

A GraphQL API that provides nearby Japanese train stations and bus stops, running on Cloudflare Workers.

Documentation

• For automation agent and contributor workflows, see AGENTS.md.
• For contribution guidelines, see CONTRIBUTING.md.
• For system architecture and design decisions, see docs/architecture.md.
• For the design of the transfer route search (connectedRoutes, RAPTOR), see docs/route-search.md.
• For technical debt analysis and architectural concerns, see docs/technical_debt.md.
• For the record of the Cloudflare Workers migration, see docs/cloudflare-workers-migration.md.
• For the published GraphQL schema, see schema/public.graphql.

Data Contribution

This project includes a comprehensive dataset of Japanese railway information in the data/ directory. The data is maintained in CSV format and contributions are primarily targeted at Japanese speakers. For detailed information about data structure and contribution guidelines, please refer to data/README.md.

Data Sources

• Track lengths between adjacent stations (Station.trackDistanceFromPrevious) are derived from the MLIT National Land Numerical Information railway data (N02), licensed under CC BY 4.0: 「国土数値情報（鉄道データ）」（国土交通省） (https://nlftp.mlit.go.jp/ksj/gml/datalist/KsjTmplt-N02-2025.html) を加工して作成
• Bus stops and routes are derived from the GTFS and ODPT feeds listed in preprocessor/src/gtfs/feed.rs and preprocessor/src/gtfs/odpt.rs.

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Kanta Demizu 🔣 🚇 💻

SAIGUSA Tomotada 🤔 🔣

mittan12 🔣

CodeRabbit 👀

tahodev 💻

This project follows the all-contributors specification. Contributions of any kind welcome!

Join our community(Japanese only)

Do you like this project? Join our Discord community! https://discord.gg/tsemdME9Nz

Development

No database is required. The data is generated into generated/*.csv and embedded into the WASM binary at build time.

rustup target add wasm32-unknown-unknown
cargo install worker-build --locked

make data     # build generated/*.csv from data/, the GTFS feeds, and the MLIT railway data
make build    # build the Worker (wasm)
make dev      # run it locally on http://127.0.0.1:8787

make help lists every target.

Testing

make test     # unit tests for every native crate
make check    # type-check, including the wasm32 target
make clippy   # lint, including the wasm32 target
make fmt      # formatting check

Tests need no external services. stationapi (domain / use case) and preprocessor (data pipeline) are covered by unit tests; the published GraphQL schema is verified in CI by diffing the Worker's SDL against schema/public.graphql.

Deploying

make deploy             # staging   -> stationapi-stg
make deploy-production  # production -> stationapi

The data lives inside the WASM binary, so a data change needs a rebuild and a redeploy; it is not picked up at runtime.