Timetable API Node

Express-based API for Lviv transport timetable data with a read-only MCP endpoint.

Requirements

• Node.js 26 (see .nvmrc)

Run locally

nvm use
make start

Test

nvm use && make test

Monitoring

Two optional integrations, both off unless their environment variable is set:

Variable	Effect
SENTRY_DSN	Error reporting via instrument.js
NEW_RELIC_LICENSE_KEY	New Relic APM via newrelic.cjs

New Relic runs as a preloaded agent, so npm start carries the flags:

node -r dotenv/config -r newrelic --import newrelic/esm-loader.mjs index.js

dotenv/config is preloaded first so .env is populated before the agent reads its configuration. The config file is newrelic.cjs (the agent is CommonJS and this project is ESM) and holds no secrets — the key comes from the environment. /health is excluded from transactions via rules.ignore.

The account is in the EU region; its license key starts with eu01xx and the agent picks the collector from that prefix. Use the 40-character ingest license key, not an NRAK-... user API key.

Cloud Run reads the key from Secret Manager:

gcloud run services update timetable-api-node --region=us-central1 --project=timetable-252615 --set-secrets=NEW_RELIC_LICENSE_KEY=new-relic-license-key:latest

MCP Server

This service exposes a public read-only MCP endpoint over Streamable HTTP.

• MCP endpoint: /mcp
• Server card: /.well-known/mcp/server-card.json
• Discovery hint: /robots.txt (non-standard comment hint)

Production deployment (see cloudbuild.yaml for Cloud Run) serves REST and MCP from api.lad.lviv.ua. The main site lad.lviv.ua is the public transport website (this repo still links there in HTML sitemap and tables for people, not for the API host). Use your own origin when running locally.

LLM and /mcp flow

An MCP client (Claude, Cursor, or the MCP SDK) talks JSON-RPC over Streamable HTTP to POST /mcp. Tool handlers reuse the same Express actions as the REST API, backed by LokiJS timetable data, GTFS SQLite (via gtfs), and live GTFS-RT feeds (for example track.ua-gis.com).

graph LR;
  Client[LLM or MCP client] -->|JSON-RPC Streamable HTTP| Mcp["POST /mcp"];
  Mcp --> Tools[Tool handlers];
  Tools --> Actions[Express actions];
  Actions --> Loki[(LokiJS)];
  Actions --> Gtfs[(GTFS SQLite)];
  Actions --> Rt[GTFS-RT upstream];
  Loki --> Actions;
  Gtfs --> Actions;
  Rt --> Actions;
  Actions --> Tools;
  Tools --> Mcp;
  Mcp -->|MCP tool result| Client;

Loading

Try the live API

MCP Inspector (local): run npx @modelcontextprotocol/inspector, then open the UI with transport and server URL prefilled (from the inspector README):

http://localhost:6274/?transport=streamable-http&serverUrl=https%3A%2F%2Fapi.lad.lviv.ua%2Fmcp

Postman / curl: call a tool on production

POST https://api.lad.lviv.ua/mcp with Content-Type: application/json and Accept: application/json, text/event-stream — the Streamable HTTP transport rejects a request that does not accept both. The server is stateless: there is no session, so tools/call works on its own without an initialize first. The response arrives as a single SSE event: message frame carrying the JSON-RPC result.

curl -s https://api.lad.lviv.ua/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"get_stop_realtime","arguments":{"stop_id":101}}}'

Example tools/call body shape:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_stop_realtime",
    "arguments": { "stop_id": 101 }
  }
}

Successful tool responses return a natural-language text summary inside MCP content items (type: "text") — e.g. "Stop «Площа Ринок»: 6 arrivals. Next: Т02 → «Пасічна» in 3 min." The full structured payload is in the structuredContent field (for schema-aware clients). Each structuredContent payload follows one contract:

{
  "view": "transit_realtime",
  "data": { "...": "tool-specific payload" },
  "ui_blocks": [
    { "type": "map", "data": { "center": [49.84, 24.03], "zoom": 14, "layers": { "stops": "data.stop", "vehicles": "data.arrivals" } } },
    { "type": "arrival_list", "data": { "source": "data.arrivals" } }
  ]
}

ui_blocks point into data instead of repeating it. A map block gives the centre and zoom, and layers maps stops, vehicles and polylines to a dot path in the result; every stop and vehicle there has lat/lng, vehicles also bearing. An arrival_list block names the arrivals array to render, already sorted by arrival_minutes (null = no ETA).

Exposed tools

All tools are read-only. Stop IDs are the numeric codes on stop signs, returned as strings ("707"). Route names are the short names on vehicles ("Т30", "А1"); Latin "T30"/"A01" work too, and a bare number is read as an internal route ID. An unknown route or vehicle returns isError: true with a hint on what to pass instead.

Tool	Arguments	Returns
search_stops	query (string, ≥ 2 chars), limit (1–25, default 10)	Stops whose Ukrainian or English name contains every query word (inflection-tolerant: "опера" finds «Театр опери та балету»), with routes.
get_stops_around_location	latitude, longitude, radius_meters (50–3000, default 1000)	Stops near a point, nearest first, with distance_meters and routes.
get_stop_realtime	stop_id	Live arrivals: route, direction (destination), vehicle_type, arrival_minutes, vehicle position.
find_routes_between	from_stop_id, to_stop_id	Direct routes within a 300 m walk of each end, best first: board_stop, alight_stop, destination, stops_count, walk at each end.
get_route_static	route_name, include_shapes (default false)	Name, type, colour, stop lists for both directions, first-stop timetable; polylines only on request.
get_route_realtime	route_name	Vehicles on the route with destination and next_stop (id, name, ISO arrival).
get_nearby_vehicles	latitude, longitude, radius_meters (100–1000, default 500), route, limit (1–50, default 15)	Live vehicles nearest first, with destination and distance_meters; total counts all in range.
get_vehicle_info	vehicle_id	One vehicle: position, route, destination, plate, upcoming stops (id, name, ISO times) not yet passed.

get_stop_realtime — example

{
  "view": "transit_realtime",
  "data": {
    "stop": { "id": "61", "name": "Площа Ринок", "lat": 49.84146, "lng": 24.03227 },
    "arrivals": [
      {
        "route": "Т02",
        "direction": "Пасічна",
        "vehicle_type": "tram",
        "arrival_minutes": 3,
        "vehicle_id": "2393",
        "lat": 49.83461,
        "lng": 24.01672,
        "bearing": 60
      }
    ],
    "updated_at": "2026-09-23T09:01:21Z"
  },
  "ui_blocks": [
    {
      "type": "map",
      "data": { "center": [49.84146, 24.03227], "zoom": 14, "layers": { "stops": "data.stop", "vehicles": "data.arrivals" } }
    },
    { "type": "arrival_list", "data": { "source": "data.arrivals" } }
  ]
}

search_stops — example

{
  "view": "transit_realtime",
  "data": {
    "query": "rynok",
    "stops": [
      {
        "id": "61",
        "name": "Площа Ринок",
        "lat": 49.84146,
        "lng": 24.03227,
        "eng_name": "Rynok square",
        "routes": ["Т01", "Т02"]
      }
    ],
    "updated_at": "2026-09-23T09:36:53Z"
  },
  "ui_blocks": [
    { "type": "map", "data": { "center": [49.84146, 24.03227], "zoom": 14, "layers": { "stops": "data.stops" } } }
  ]
}

One stop name usually covers both sides of the street under different IDs; each is returned, and routes tells them apart. get_stops_around_location returns the same stop objects plus distance_meters.

find_routes_between — example

Text summary: "3 direct routes «Площа Ринок» → «Залізничний вокзал». Best: Т01 towards «Залізничний вокзал», 8 stops, board at «Руська» (137m walk)."

{
  "view": "transit_realtime",
  "data": {
    "from": { "id": "61", "name": "Площа Ринок", "stop_ids": ["10", "57", "58", "59", "61", "63", "855"] },
    "to": { "id": "118", "name": "Залізничний вокзал", "stop_ids": ["117", "118", "188", "189", "190", "191"] },
    "options": [
      {
        "route": "Т01",
        "vehicle_type": "tram",
        "direction": 0,
        "destination": "Залізничний вокзал",
        "board_stop": { "id": "58", "name": "Руська", "lat": 49.84186, "lng": 24.03408 },
        "alight_stop": { "id": "118", "name": "Залізничний вокзал", "lat": 49.839, "lng": 23.99677 },
        "stops_count": 8,
        "walk_to_board_meters": 137,
        "walk_from_alight_meters": 0
      }
    ],
    "updated_at": "2026-09-23T09:36:53Z"
  },
  "ui_blocks": []
}

Each end covers every stop within a 300 m walk (stop_ids): a line's two directions often stop on opposite sides of a street under different names, as here, where Т01 towards the station leaves from «Руська», not «Площа Ринок». Options are ranked by stops plus walking (150 m of walking weighs as one stop), one per route and direction. A direction's last stop counts as a place to get off, not to board. Only direct routes are listed; an empty options means a transfer is needed.

get_route_static — example

{
  "view": "transit_realtime",
  "data": {
    "route": { "name": "Т30", "long_name": "Університет - Городоцька - вул. Ряшівська", "color": "#EF88AA", "type": "trolleybus" },
    "stops": [
      [
        {
          "id": "101", "name": "Університет", "lat": 49.841, "lng": 24.003,
          "departures": ["05:30", "05:52"],
          "schedule": { "workday": ["05:30", "05:52", "06:10"], "weekend": ["07:00", "07:30"] }
        },
        { "id": "707", "name": "Стадіон Сільмаш", "lat": 49.838, "lng": 24.021, "departures": [], "schedule": { "workday": [], "weekend": [] } }
      ],
      [
        { "id": "707", "name": "Стадіон Сільмаш", "lat": 49.838, "lng": 24.021, "departures": ["06:00"], "schedule": { "workday": ["06:00"], "weekend": [] } }
      ]
    ],
    "updated_at": "2026-09-23T09:01:12Z"
  },
  "ui_blocks": [
    { "type": "map", "data": { "center": [49.841, 24.003], "zoom": 13, "layers": { "stops": "data.stops" } } }
  ]
}

stops[0] is direction 0 (outbound), stops[1] direction 1 (return). departures and schedule are populated for the first stop of each direction; other stops have empty arrays. schedule.workday is Monday–Friday, schedule.weekend Saturday–Sunday; departures keeps today's schedule for backward compatibility. With include_shapes: true, data.shapes holds one [lat, lng] polyline per direction and the map block adds "polylines": "data.shapes".

get_route_realtime — example

{
  "view": "transit_realtime",
  "data": {
    "route_name": "Т01",
    "destinations": ["Залізничний вокзал", "Погулянка"],
    "vehicles": [
      {
        "id": "5907",
        "direction": 0,
        "destination": "Залізничний вокзал",
        "next_stop": { "id": "118", "name": "Залізничний вокзал", "arrival": "2026-09-23T09:35:00.000Z" },
        "lat": 49.83947,
        "lng": 23.99566,
        "bearing": 126,
        "lowfloor": true
      }
    ],
    "updated_at": "2026-09-23T09:32:10Z"
  },
  "ui_blocks": [
    { "type": "map", "data": { "center": [49.83947, 23.99566], "zoom": 13, "layers": { "vehicles": "data.vehicles" } } }
  ]
}

route_name is the canonical short name whatever form was passed. direction indexes get_route_static's stops (0 = outbound, 1 = return) and destinations. next_stop is null when the feed has no trip update for the vehicle.

get_nearby_vehicles — example

{
  "view": "transit_realtime",
  "data": {
    "center_lat": 49.8419,
    "center_lng": 24.0316,
    "radius_meters": 500,
    "total": 18,
    "vehicles": [
      {
        "id": "3422",
        "route": "Т01",
        "vehicle_type": "tram",
        "direction": 0,
        "destination": "Залізничний вокзал",
        "lat": 49.84154,
        "lng": 24.03364,
        "bearing": 258,
        "lowfloor": false,
        "distance_meters": 152
      }
    ],
    "updated_at": "2026-09-23T09:32:10Z"
  },
  "ui_blocks": [
    { "type": "map", "data": { "center": [49.8419, 24.0316], "zoom": 15, "layers": { "vehicles": "data.vehicles" } } }
  ]
}

get_vehicle_info — example

{
  "view": "transit_realtime",
  "data": {
    "vehicle_id": "5907",
    "route": "Т01",
    "license_plate": "1238",
    "lat": 49.83947,
    "lng": 23.99566,
    "bearing": 126,
    "direction": 0,
    "destination": "Залізничний вокзал",
    "upcoming_stops": [
      { "id": "118", "name": "Залізничний вокзал", "arrival": null, "departure": "2026-09-23T09:35:00.000Z" },
      { "id": "188", "name": "Приміський вокзал", "arrival": "2026-09-23T09:35:49.000Z", "departure": null }
    ],
    "updated_at": "2026-09-23T09:32:10Z"
  },
  "ui_blocks": [
    { "type": "map", "data": { "center": [49.83947, 23.99566], "zoom": 15, "layers": { "vehicles": "data" } } }
  ]
}

route is the route short name, falling back to the opaque GTFS route ID only when the route is missing from the local data. Either value is accepted as route_name by get_route_static and get_route_realtime. license_plate is null when the feed has none.

Prompts

Reusable instruction templates for rendering workflows. Each takes one argument, stop_id (positive integer or digits-only string).

Prompt	Use case
transit-map-view	Map-first rendering of live vehicles for a stop.
transit-arrival-list	Arrival list for a stop, sorted by ETA and grouped by route.
transit-hybrid-view	Map block first, arrival-list block second, with ETA values kept consistent across both.

Resources and resource templates

In addition to tools, the server exposes MCP resources for reference data that doesn't require a tool call:

URI	Description
timetable://about	Scope, usage, and data caveats for this server (Markdown)
timetable://reference/tools	Tools reference table (Markdown)
timetable://reference/prompts	Prompt templates catalog (Markdown)
timetable://stop/{code}	Static info for a stop by numeric code — name, coordinates, serving routes (JSON)
timetable://route/{name}	Static metadata for a route by short name — color, type, stop counts (JSON)

Security model

• Public read-only (no authentication).
• No mutating tools are exposed.
• POST /mcp is rate-limited to 60 requests/min per IP (in-memory, resets on restart). Excess requests receive HTTP 429 with a JSON-RPC error body.
• robots.txt is only a best-effort discovery hint and not a protocol contract.

REST API

All endpoints return JSON. :code is a numeric stop code; :name is a route short name (e.g. T1, 32A) or numeric external ID.

Stops

GET /stops.json

All stops as a JSON array, sorted by code.

• Response: array of { code, name, eng_name, location: [lat, lng], routes, sign, sign_pdf }.

(GET /stops returns an HTML table instead.)

Per-stop route overrides

The upstream route list for a stop is sometimes behind reality. GET /stops applies a stored override to its Маршрути column — removed routes shown red and struck through, added ones green — and hangs the matching ?add=/?remove= on that row's SVG and PDF links, which offline.lad.lviv.ua and pdf.lad.lviv.ua both understand.

The route column is always clickable: click a route to drop or restore it, type one into the + box to add it.

Overrides live in the browser's own localStorage (see public/stopOverrides.js), not on a server — no account to edit through, no cache to purge, an edit applies at once. The trade is scope: an override is visible only in the browser that made it, not to anyone else who opens /stops.

/stops.json reports sign and sign_pdf without overrides applied.

GET /stops/:code

Single stop with live realtime timetable. Short-cached (5–10 s).

• Optional: skipTimetableData=1 — omit live arrivals (long-cached response).
• Response: { code, name, eng_name, latitude, longitude, transfers, timetable }.

GET /stops/:code/timetable

Live timetable only for a stop. Short-cached (5–10 s).

• Response: array of timetable items.

GET /stops/:code/static

Static stop info without live data. Long-cached (30 days).

• Response: { code, name, eng_name, latitude, longitude, transfers }.

GET /closest?latitude={lat}&longitude={lng}

Nearby stops — same search as get_stops_around_location, for non-MCP clients.

• Optional: radius — meters, clamped between 50 and 3000 (default 1000).
• Response: JSON array of { code, name, latitude, longitude, distance_meters } (sorted by distance).

Routes

GET /routes.json

All routes as a JSON array, sorted by short name.

• Response: raw route objects from the timetable store.

(GET /routes returns an HTML table.)

GET /routes/static/:name

Route shape, stop list, and metadata. Long-cached (30 days).

• Response: { id, color, type, route_short_name, route_long_name, stops: [[dir0…], [dir1…]], shapes }.
• Each stop object: { code, name, loc, transfers, departures, schedule }.
  • departures — today's departure times (HH:MM), populated only for direction 0 first stop. Kept for backward compatibility.
  • schedule — { workday: string[], weekend: string[] } departure times by day type, populated only for direction 0 first stop.

GET /routes/dynamic/:name

Live vehicle positions for a route. Short-cached (10 s).

• Response: array of { id, direction, location: [lat, lng], bearing, speed, lowfloor }. speed is m/s from the GPS unit, or null when not reported.

Vehicles

GET /vehicle/:vehicleId

Live position and upcoming stop arrivals for one vehicle. Short-cached (5 s).

• Response: { location: [lat, lng], routeId, bearing, speed, direction, licensePlate, arrivals }. speed is m/s from the GPS unit, or null when not reported.

GET /vehicle-by-plate/:plate

Look up a vehicle ID by its license plate. Short-cached (5 s).

• The plate is matched case-insensitively with spaces and dashes ignored (BC-1234-AA, bc 1234 aa, and bc1234aa are all equivalent).
• Response: { vehicleId } — use the returned ID with GET /vehicle/:vehicleId.

GET /transport?latitude={lat}&longitude={lng}

Vehicles within 1 km of a point. Short-cached (10 s).

• Response: array of { id, route, routeId, direction, vehicle_type, color, location: [lat, lng], bearing, speed, lowfloor }. routeId is usable as :name in /routes/static/:name; direction matches the index into stops/shapes (0 = outbound, 1 = return, null if unknown). speed is m/s or null.