新增文章缺少 title 的問題

[handred800]

我用 fetch POST request 到 /posts，從 Network 看回傳的訊息為 message:"Invalid request, \"title\" is required"
payload (body內容)看起來是有成功傳入 title 才對

{
    body:"I saw something behind."
    title:"spooky"
    userId:"055b9e088ab1a4"
}

fetch 的 options 如下

{
      method: 'POST',
      credentials: 'include',
      'content-type': 'application/json',
      headers: { authorization: `Bearer ${token}` },
      body: JSON.stringify(paramsObj), //這邊就是 payload (body的內容)
}

請問為什麼會回傳缺少 title 呢?