[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2017-03-15.19:31:51]

This could be done by [creating a plugin](http://book.orthanc-server.com/developers/creating-plugins.html) that would use the `OrthancPluginDicomInstanceToJson()` primitive available in the [plugin SDK](http://sdk.orthanc-server.com/group__Toolbox.html#ga435dba46ef20352fb0f600b944239a32), with the `maxStringLength` argument set to zero.