Abstract Introduction. The aim of this thesis is to examine use of library didactics in two prominent national libraries. A second aim is to identify digital resources used in the digital library spaces. The study uses “the four-space model” to examine this relation.  Method. Document analysis is used to examine the two national libraries´ websites. In addition to the websites, affiliated sites like social media are also included. Categories from the four- space model are used: learning space, inspiration space, performative space and meeting space. Digital resources are identified and presented in each category respectively.   Theories. Library didactics, as developed by for example Jochumsen, Rasmussen and Skot- Hansen, is the subject of the thesis and main theoretical focus. The digital library rooms are seen as places for possibilities and for developing innovative library practices.  Conclusion. The results imply that of the four spaces, the smallest one is the performative space and that the activities for creating are few. Different social media are to a large degree used as meeting space and thus possibilities for meeting and participation are subject to the companies’ business models and policies. In relation to the visitors the two national libraries mainly use their collections as resources in the inspiration space. One clear example is Gallica, described as a digital library with focus on digitized documents.  In the learning space the format is primarily texts with illustrations and this could be seen as an attempt from the libraries to adapt to a traditional learning environment. Furthermore it is concluded that the search functions can be a hindrance to both the visitor and to the libraries´ objectives. In the discussion, a question concerning competences is raised in regard to innovative library didactics. This is a two years master’s thesis in Library and Information Science.