node.js - express怎么拼接json返回？

Question

我用nodejs写服务器，如果我想把我从数据库里查收的对象返回去直接用res.json(doc),但是如果我想在json中加一个字段message：sucess。表示成功怎么写？
就是我想把所有的请求返回的json中都带有message字段这个怎么加？

Answer 1

The easiest way:

res.json(JSON.stringify({data: doc, message: success}))

But it will be annoying to write like this all the time. You will gradually optimize your writing

function toJSON (data = {}, message = '', status = '', code = '') {
    return {
        JSON.stringify({ data, message, status, code })
    }
}

Answer 2

res.json supports objects, just write res.json({data, message: 'success'}) like this. If you use strings, it is best to use res.send, res.end, otherwise res.json has to determine the type.

The object returned in this way is

{
    message: 'success',
    data: {} // 原有data.
}

It is recommended to do this, with a layer of packaging. If you add the data field directly to message, if data itself also has a message field, wouldn’t it be overwritten?