brain.json, exactly as it sits on disk, all on one line:
{"schema_version":1,"nodes":[{"kind":"question","text":"Does it have fur?","yes":1,"no":2},{"kind":"answer","text":"a dog","yes":null,"no":null},{"kind":"question","text":"Does it have feathers?","yes":3,"no":4},{"kind":"answer","text":"a pigeon","yes":null,"no":null},{"kind":"answer","text":"a newt","yes":null,"no":null}]}

and the same thing, one node to a line:
  schema_version: 1
  0  {"kind":"question","text":"Does it have fur?","yes":1,"no":2}
  1  {"kind":"answer","text":"a dog","yes":null,"no":null}
  2  {"kind":"question","text":"Does it have feathers?","yes":3,"no":4}
  3  {"kind":"answer","text":"a pigeon","yes":null,"no":null}
  4  {"kind":"answer","text":"a newt","yes":null,"no":null}
