Json is a nightmare to write.

Compare this pkl code:

host: String
port: UInt16(this > 1000)

To the equivalent in json-schema:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "host": {
      "type": "string"
    },
    "port": {
      "type": "number",
      "minimum": 1000,
      "exclusiveMinimum": true
    }
  },
  "required": ["host", "port"]
}

I think it’s pretty clear pkl is better.