atb

A minimal API for bus data in Trondheim, Norway. This API proxies requests to Entur APIs and converts the responses into a sane JSON format.

Responses from the proxied APIs are cached. By default bus stops will be cached for 1 week and departures for 1 minute.

As of mid-August 2021 the SOAP-based AtB API no longer returns any departure data. According to this blog post on open data it appears the preferred API is now Entur. The /api/v1/ paths have therefore been removed.

Version 2 has been implemented and proxies requests to Entur instead. These are the changes in version 2:

• There is no version 2 variant of /api/v1/busstops. Use https://stoppested.entur.org/ to find valid stop IDs.
• Entur uses different stop IDs so old ones, such as 16011376, cannot be used in version 2. A stop includes departures in both directions by default so there is no longer a unique stop for each direction.
• The registeredDepartureTime field may be omitted.
• The isGoingTowardsCentrum field has moved to the departure object.

This API aims to be compatible with BusBuddy (which appears to be defunct).

Usage

$ atb -h
Usage of atb:
  -d string
    	Departure cache duration (default "1m")
  -l string
    	Listen address (default ":8080")
  -s string
    	Bus stop cache duration (default "168h")
  -x	Allow requests from other domains

API

/

Lists all available API routes.

Example:

$ curl https://mpolden.no/atb/ | jq .
{
  "urls": [
    "https://mpolden.no/atb/v2/departures"
  ]
}

/api/v2/departures

List departures from the given bus stop, identified by a stop ID. Use https://stoppested.entur.org to find stop IDs, for example 41613 (the number part of NSR:StopPlace:41613) for Prinsens gate.

Departures traveling in any direction are included by default. Add the parameter direction=inbound or direction=outbound to filter departures towards, or away from, the city centre.

Note that the claimed direction is questionable in some cases so inspect the responses to decide whether inbound or outbound makes sense for your use case.

$ curl 'https://mpolden.no/atb/v2/departures/41613?direction=inbound' | jq .

{
  "url": "https://mpolden.no/atb/v2/departures/41613",
  "departures": [
    {
      "line": "71",
      "scheduledDepartureTime": "2021-08-11T23:49:38.000",
      "destination": "Dora",
      "isRealtimeData": true,
      "isGoingTowardsCentrum": true
    },
    ...
  ]
}