JSON Schema object contains value

Question

I want to check that "obj" contains at least one value "test". But keys in the "obj" are random.

Json:

{
  "title": "doc",
  "obj": {
   "xxxx-random": "test",
   "zzzz-random": "wol"
  }
}

My idea was to use oneOf but it doesn't work as I expected:

Schema Json:

{
  "properties": {
    "title": {
      "type": "string"
    },
    "obj": {
      "type": "object",
      "oneOf": [
        {
          "contains": {
            "properties": {
              "type": "string",
              "desc":"test"
            }
          }
        }
      ]
    }
  }
}

user_40468 · Answer

You can do that with slightly-mindbending uses of the "not" keyword. That is, we can construct a schema that asserts:

the property "obj" must exist
"obj"'s value is an object, and there must be at least one property
and it cannot be true that all properties under "obj" do NOT match "test"

{
  "type": "object",
  "required": ["obj"],
  "properties": {
    "obj": {
      "type": "object",
      "minProperties": 1,
      "not": {
        "additionalProperties": { "not": { "const": "test" } }
      }
    }
  }
}

JSON Schema object contains value

1 Answers