dav-git / trias-client

Lean Node.js client for public transport TRIAS API

A word of warning

This fork has been created due to the apparent abandonment of the original project.
I just wanted to support the Cancelled attribute in my own project.
I am in no way qualified to tinker with this stuff and I don't know how to create installable node packages.
⚠️ This package can not be installed via NPM.
I've personally just resorted to dropping it in my app root as a git submodule and importing it from there.
This is not how you should do things.

TRIAS Client

A lean Node.js client for TRIAS APIs. 🚀

This client aims to be an easy to use and lightweight implementation for the public transport TRIAS specification. It achieves that by providing only a small subset of the capabilities of TRIAS and utilizing the Friendly Public Transport Format.

trias-client currently implements TRIAS v1.2 and only supports following basic functionalities:

• Searching for stops (either using a name or coordinates).
• Fetching departures for a stop.
• Reading current ticker news for a stop.
• Navigating from stop to stop.

Usage

Please note that you will need an API endpoint and an API key or requestor reference key issued by a data provider. Check the providers list for open APIs.

Install the package:

npm install trias-client

Following script creates a client instance, searches for a station and fetches the departures for the first result. Please refer to the documentation for more information.

const trias = require("trias-client");

var client = trias.getClient({
    url: "place the url of the TRIAS API here",
    requestorRef: "place your requestor ref here"
});

var stopsResult = await client.getStops({
    name: "bismarckplatz"
});

var departuresResult = await client.getDepartures({
    id: stopsResult.stops[0].id
});

There's also an example script available that demonstrates how to use trias-client.

What is TRIAS?

TRIAS stands for "Travellor Realtime Information and Advisory Standard", has been developed in scope of the research and standardisation project for public transport "IP-KOM-ÖV" and was then introduced in 2014 as a standardized specification by the VDV (Verband Deutscher Verkehrsunternehmen). TRIAS offers a wide-range list of functionalities, including station / location search, realtime departures, navigation, ticket price calculation, malfunction reportings, and so on. Here is a list of all public transport providers that provide a TRIAS API.

Why TRIAS?

Compared to HAFAS, TRIAS isn't that widely distributed. But it's a step in the right direction as it allows for some kind of standardization in the jungle of Public Transport APIs. Unfortunately, many of the data providers still build their own proprietary APIs.

You might wonder why this even matters if you can just continue to use the existing HAFAS interfaces. The biggest difference is that these HAFAS interfaces are not supposed to be used by the public and public transport providers might even prohibit to use them (you can read more about that here). So if you want to develop and publish a project that uses public transport data, you might want to have some kind of agreement with the data provider, that reduces operational and legal risk for both you and the provider.

And this is where TRIAS becomes relevant, as the APIs built on it are public (not open, as they still require authentication, but public). And while some providers are a bit more strict regarding the use and display of the data, in general all of the APIs have fair terms of use and come with realistic usage quotas.

Related resources

trias-client was originally developed in scope of Abfahrt, a public transport companion (retired as of December 2022) that integrates multiple ÖPNV providers in just one app. You can take a look over there to see this client in action.

Dou you want to develop your own TRIAS client? Here are some resources:

• VDV 431-2 EKAP-Schnittstellenbeschreibung (german)
• VDV TRIAS XML specification
• TRIAS implementation example in PHP
• TRIAS request examples (german)