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Hmm, strange. I suggest filing a github issue, most likely the matcher is not adapted to the JSON matching interface.

Hi @Andrew Ripley, this seems to do the trick I think:

{
  "request": {
    "method": "POST",
    "urlPath": "/data",
    "bodyPatterns": [
      {
        "or": [
          {
            "matchesJsonPath": {
              "expression": "$.restrictions.size()",
              "or": [
                {
                  "matches": "0"
                },
                {
                  "matches": "1"
                },
                {
                  "matches": "2"
                }
              ]
            }
          },
          {
            "matchesJsonPath": {
              "expression": "$.restrictions",
              "absent": true
            }
          }
        ]
      }
    ]
  },
  "response": {
    "status": 200,
    "body": "\nOK\n"
  }
}

@Tom that did the trick!! thank you so much! and happy new year!!

I think you might struggle to get the array size thing working without applying a fix to the upstream JSONPath library, but if you can find a solution we’d be happy to merge it

ah good to know. ill poke around 🙂