One sec, I’ll get an example

So, the following mapping:

{
  "request": {
    "url": "/test"
  },
  "response": {
    "status": 200,
    "bodyFileName": "{{ jsonPath request.body '$.filename'}}.json"
  }
}

Will return the value of the

filename

key in the request body. So, a request with a body like

{ filename: "test" }

, would resolve to

test.json

, and serve up the file at

__files/test.json

.