This project provides a RESTful web API to query and manipulate a Gramps family tree database. It can serve e.g. as backend for a web app. Gramps Web API is the backend powering Gramps Web.
The documentation of the current state of the API can be browsed with Swagger:
The project is still under development, so API changes should be expected.
The project's documentation is hosted at https://gramps-project.github.io/web/.
See the documentation site for a link to the demo server.