Question

A developer wants Claude to return only a JSON object with no preamble like "Here is the JSON you requested:". The output is being parsed programmatically and any extra text breaks the parser. Which technique most directly forces Claude to begin its response with the JSON structure itself?

Accepted Answer

Prefill the assistant turn with an opening "{" so Claude continues directly from the JSON structure

Answer

Raise the temperature so Claude produces more focused, structured output

Answer

Add more multishot examples showing full conversational sentences before the JSON

Answer

Increase max_tokens so the response has room to include the preamble and the JSON