In various parts of Leiden, a resident needs a permit to park his/her car in the street. The price depends on the zone.
The car permit for residents can digitally be obtained at the municipality (only partially in English).
In case you share a car, and you are member of an interest group that promotes car sharing, Vereniging voor Gedeeld Autogebruik, then you could apply for a shared-car permit (Deelautovergunning).