meta.schema.json

{
  "$schema": "http://json-schema.org/draft-04/schema",
  "definitions": {
    "nonEmptyString": {
      "type": "string",
      "minLength":  1
    },
    "multiString": {
      "anyOf": [
        { "$ref": "#/definitions/nonEmptyString" },
        {
          "type": "array",
          "items": { "$ref": "#/definitions/nonEmptyString" },
          "uniqueItems": true
        }
      ]
    }
  },
  "type": "object",
  "properties": {
    "name": { "$ref": "#/definitions/nonEmptyString" },
    "description": { "type": "string" },
    "namespace": { "$ref": "#/definitions/nonEmptyString" },
    "version": { "$ref": "#/definitions/nonEmptyString" },
    "downloadURL": { "$ref": "#/definitions/nonEmptyString" },
    "updateURL": { "$ref": "#/definitions/nonEmptyString" },
    "icon": { "$ref": "#/definitions/nonEmptyString" },
    "include": { "$ref": "#/definitions/multiString" },
    "exclude": { "$ref": "#/definitions/multiString" },
    "match": { "$ref": "#/definitions/multiString" },
    "require": { "$ref": "#/definitions/multiString" },
    "resource": { "$ref": "#/definitions/multiString" },
    "grant": {
      "anyOf": [
        {
          "type": "array",
          "items": {
            "type": "string",
            "enum": [
              "unsafeWindow",
              "GM_getValue",
              "GM_setValue",
              "GM_listValues",
              "GM_deleteValue",
              "GM_getResourceText",
              "GM_getResourceURL",
              "GM_addStyle",
              "GM_log",
              "GM_openInTab",
              "GM_registerMenuCommand",
              "GM_setClipboard",
              "GM_xmlhttpRequest"
            ]
          },
          "uniqueItems": true
        },
        {
          "type": "string",
          "enum": [ "none" ]
        }
      ],
      "default": "none"
    },
    "run-at": {
      "type": "string",
      "enum": [ "document-end", "document-start", "document-idle" ],
      "default": "document-end"
    },
    "noframes": {
      "type": "boolean",
      "default": false
    }
  },
  "additionalProperties": {
    "anyOf": [
      { "$ref": "#/definitions/multiString" },
      { "type": "boolean" }
    ]
  },
  "required": ["name", "namespace", "version"]
}