# API Version 3 _Status: under development_ The documentation for APIv3 is written according to the [OpenAPI 3.0 Specification](https://swagger.io/specification/). The file in the repository is split up into many files. Some OAS (OpenAPI Specification) do not support that. You can retrieve the complete, singular file from any OpenProject server under `/api/v3/spec.json` or `/api/v3/spec.yml`. Additionally, there is a script that outputs the specification as a whole as well, either as json or yaml depending on the given format argument: ``` ./script/api/spec --format yaml > openproject-oas.yml ```