Improper error message for "unevaluatedProperties": false schema always fails

[FloriNNic]

Hi,

I am trying to validate against a schema that does not allow unevaluated properties and I'm getting the following error every single time: false schema always fails. I managed to reproduce the behavior on a smaller schema:

• Schema: { "$schema": "http://json-schema.org/draft/2020-12/schema#", "type": "object", "properties": { "key2": { "type": "string" } }, "unevaluatedProperties": false }

• Document to validate: { "key": "val" }

Any thoughts on this?

Thanks in advance,
Florin

[erosb]

Hello Florin,

AFAIR this is a known issue also highlighted by a failing test from the failing test suite. The problem is that in the "unevaluatedProperties" implementation only the properties which are one nesting level deeper are marked as evaluated, not by adjacent keywords. By "one nesting level deeper" I mean nested by allOf/anyOf/oneOf/if-then-else.

As a quick workaround I suggest writing your schema as

{
  "$schema": "http://json-schema.org/draft/2020-12/schema#",
  "allOf": [
    {
      "type": "object",
      "properties": { "key2": { "type": "string" } }
    }
  ]
  "unevaluatedProperties": false
}

Hope it helps.