Open APIs

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• Materials of Helsinki City Archives

  The Sinetti archive information system operated by the City of Helsinki Archives provides collection data from archived documents of the City of Helsinki. The document...

  • JSON

• Address API of Uusimaa

  You can use the address interface of Uusimaa to search for official addresses and their coordinates for the entire Uusimaa region. The interface provides the coordinates, postal...

  • JSON
  • XML

• Linked Events Helsinki API

  You can use Helsinki’s Linked Events API to retrieve event data of several City of Helsinki divisions and the Helmet library service in a uniform format. The geographic data is...

  • JSON