Rejseplanen
Danish public transport journey planner API covering all buses, trains, metro, and harbour buses nationwide.
Rejsekort (the Danish travel-card system) has no official developer API; a 2015 proposal for one never shipped. The only third-party access is an unofficial scraper (tranberg/rejsekort-api) that logs into selvbetjening.rejsekort.dk using the user's own credentials to read balance and travel history — explicitly self-described by its author as having access to everything in Rejsekort Self Service, with a warning to be careful.
No sanctioned API exists. The one community scraper found hasn't been updated since 2018 and requires the user's real Rejsekort Selvbetjening credentials, which grants full account access — do not use without explicit, informed user consent, and expect it to break without notice.
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Danish public transport journey planner API covering all buses, trains, metro, and harbour buses nationwide.
Danish State Railways — no public API. Ticket data accessible via browser automation only.
The Danish Road Directorate API for real-time traffic data, road conditions, and incidents.