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Displays an info screen with the next Wiener Linien public transport connections nearby.
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Displays an info screen with the next Wiener Linien public transport connections nearby. It was developed and is currently in use at Metalab.

It includes a small server written in Node.js that pulls the needed data from the Wiener Linien API, caches it and serves it together with an HTML5 frontend. At Metalab, all of this runs on a Raspberry Pi, which also displays the frontend on a spare monitor (check out util for reproduction).

Screenshot of Öffimonitor running at Metalab


  1. Run npm install to fetch dependencies.
  2. Move server/settings.example.js to server/settings.js and
  3. Add your API key (mandatory, get one here).
  4. Most likely you will also want to change the api_ids to the RBL numbers that correspond to the stops you want to include (find them here) and change the location_coordinate to the location of your Öffimonitor.
  5. Change additional settings (optional).
  6. Run npm start
  7. Open Öffimonitor in a browser of your choice.


Besides the HTML frontend you can find a JSON API at /api. It returns a status message, an array of departures and an array of warnings, which include all traffic infos of the type stoerunglang from the Wiener Linien API.

Example response

  "status": "ok",                       // 'ok' or 'error'
    "stop": "Landesgerichtsstraße",
    "coordinates": [16.3568570699034,48.2145510683941],
    "line": "43",
    "type": "ptTram",
    "towards": "Neuwaldegg",
    "barrierFree": true,
    "time": "2017-02-14T18:54:14.000Z", // calculated most accurate departure time
    "timePlanned": "2017-02-14T19:52:00.000+0100",
    "timeReal": "2017-02-14T19:54:14.000+0100",
    "countdown": 6,
    "walkDuration": 197.9,              // walking duration to stop in seconds
    "walkStatus": "soon"                 // 'too late', 'hurry' or 'soon'
  "warnings": [{
    "title": "43 : Fremder Verkehrsunfall",
    "description": "Nach einer Fahrtbehinderung kommt es auf der Linie 43 zu unterschiedlichen Intervallen."

All values without comments are directly taken from the Wiener Linien API. Attention! timeReal does not exist in case there is no real time information available and even timePlanned might be undefined if the departure time is written into the towards string (e.g. 'KARLSPLATZ NÄCHSTER ZUG 9 MIN'). In case you need a returned timestamp, rely on time, which always contains the most accurate departure time available.

Example error response

  "status": "error",
  "error": "API request failed"


We highly appreciate any and all help. If (or better, when) you find a bug, please open an issue on Github – please tag the issue with the Metalab tag, if the issue is specifically about the Öffimonitor at Metalab.

Pull requests are also very welcome, especially if they fix a bug or add features requested in an issue. Please be aware that if you open a PR, you agree with licensing your code under AGPL-3. You might have noticed that our client-side code has no dependencies and we would like to keep it that way. If you disagree with that approach or want to make bigger changes, please open an issue and discuss things with us first. We might not merge PRs if we feel that the changes do not reflect the usage of Öffimonitor at Metalab, but we're happy about forks as well!

Here's a list of awesome forks:


This project is licensed under AGPL-3 by Metalab. It includes several external assets in the folder site/assets, namely a bunch of pictograms (all SVG files) which are licensed under Creative Commons Namensnennung 3.0 Österreich by Stadt Wien – Wiener Linien as well as the Roboto font (all TTF files) by Google licensed under Apache 2.0.

For calculating the walking duration to the stop, Öffimonitor by default queries the OSRM Demo Server and caches these results for the current runtime execution. By using the OSRM Demo Server you agree to this API usage policy. The corresponding database is licensed under ODbL by OSRM. You can change the server address to any other OSRM instance in server/settings.js or leave it blank to disable the feature.


Happy hacking! <3

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