Getting response data as a fixed & Consistent JSON response

API
23

I have tweaked my preferred prompt to give a better response, and specifically say to provide RFC8259 compliant JSON. I have had consistent results using Chat-GPT as with Davinci, although for Chat-GPT I had to also add the instruction not to provide an explanation to consistently only get the JSON without any pre-amble;

system prompt:

Pretend you are an expert language translator

user prompt:

Create a list of three random source phrases and three random translations for each.
Do not include any explanations, only provide a  RFC8259 compliant JSON response  following this format without deviation.
[{
  "source_language": "language of original phrase",
  "source_phrase": "the phrase to be translated",
  "translations": [{
    "trans_language": "language of the translation",
    "translation": "the translated phrase"
  }]
}]
The JSON response:

This gives a consistent JSON response along the lines of…

[{
  "source_language": "English",
  "source_phrase": "I love pizza",
  "translations": [{
    "trans_language": "Spanish",
    "translation": "Me encanta la pizza"
  },{
    "trans_language": "Italian",
    "translation": "Amo la pizza"
  },{
    "trans_language": "French",
    "translation": "J'adore la pizza"
  }]
},{
  "source_language": "Mandarin",
  "source_phrase": "你好吗？",
  "translations": [{
    "trans_language": "English",
    "translation": "How are you?"
  },{
    "trans_language": "Korean",
    "translation": "어떻게 지내?"
  },{
    "trans_language": "Japanese",
    "translation": "お元気ですか？"
  }]
},{
  "source_language": "Russian",
  "source_phrase": "Я люблю мороженое",
  "translations": [{
    "trans_language": "German",
    "translation": "Ich liebe Eis"
  },{
    "trans_language": "Turkish",
    "translation": "Dondurma seviyorum"
  },{
    "trans_language": "Polish",
    "translation": "Kocham lody"
  }]
}]