GTFS RT JSON Representation

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Tyler Shuster

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Oct 22, 2025, 3:08:54 PM10/22/25

to 511SFBayDeveloperResources

Although undocumented, the GTFS RT feeds from 511 can be output in JSON by specifying ?format=json

We've used this in the past but now that I'm working on a project consuming the ProtoBuf format, I'm noticing that the JSON representation's keys do not match the spec defined here: https://gtfs.org/documentation/realtime/proto/ For example, instead of entity, it uses Entities, and instead of tripUpdate it uses TripUpdates.