schema.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "title": "r-universe packages.json",
    "description": "A packages.json file controlling the contents of your r-universe",
    "type": "array",
    "items": {
      "type": "object",
      "properties": {
        "package": {
          "description": "The name of the R package",
          "type": "string"
        },
        "url": {
          "description": "The URL to the git repository with the package source code",
          "type": "string",
          "format": "uri"
        },
        "subdir": {
          "description": "A subfolder of the repository containing the R package",
          "type": "string"
        },
        "branch": {
          "description": "The branch from which the package should be built",
          "type": "string"
        },
        "display_website": {
          "description": "Should this package be displayed on the epiforecasts.io website?",
          "type": "boolean"
        }
      },
      "required": ["package", "url"]
    }
}