Structured Output (JSON Mode)

• Endpoint: POST https://api.olddog.shop/v1/chat/completions
• Purpose: Force strictly valid JSON output for reliable parsing and storage (aligned with OpenAI JSON mode).

Tip: When using JSON mode, explicitly instruct the model in system or user messages to “output JSON only, no extra text”.

Request parameters (common set)

Name	Type	Required	Description
model	string	Yes	Model ID.
messages	array	Yes	Chat messages.
response_format	object	No	Structured output format, e.g. { "type": "json_object" }.
temperature	number	No	Recommended low (e.g. 0) for stability.

cURL example (JSON only)

curl --request POST "https://api.olddog.shop/v1/chat/completions" \
  --header "Authorization: Bearer $OLD_DOG_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
    "model": "gpt-4o-mini",
    "response_format": { "type": "json_object" },
    "messages": [
      {
        "role": "system",
        "content": "你是数据提取器。只输出 JSON，不要输出任何解释性文字。"
      },
      {
        "role": "user",
        "content": "从这段话里提取姓名和手机号：张三的电话是 13800138000。"
      }
    ],
    "temperature": 0
  }'