Express正文解析器无法正确解析对象

Question

当我使用

app.use(express.json());
app.use(express.urlencoded({extended: true}));

然后客户发布了此信息：

form:
{
    permission: {'45': 'asdf'},
    project_id: '98293949-c650-46d9-8bdb-fc57fb30fd88',
    task_id: '86325d50-7813-40ae-a8f9-7ddaf3f1790d',
    user_id: 'uvjKMSB0euYrCy45XhmpuQEQaZF2'
} 

当我console.log req.body时

res.send('the api is working'+JSON.stringify(req.body),);

  

{“ permission”：[“ asdf”]，“ project_id”：“ 98293949-c650-46d9-8bdb-fc57fb30fd88”，“ task_id”：“ 86325d50-7813-40ae-a8f9-7ddaf3f1790d”，“ user_id”： “ uvjKMSB0euYrCy45XhmpuQEQaZF2”}

为什么在字段权限处的正文请求是“ permission”：[“ asdf”] 而不是 {'45'：'asdf'} ？

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