Express.js中res.send和res.json之间的区别 [英] Difference between res.send and res.json in Express.js

问题描述

res.send 和 res.json 之间的实际区别在于似乎执行相同的操作

What is actual difference between res.send and res.json as both seems to perform same operation of responding to client.

推荐答案

方法在传递对象或数组时是相同的，但 res.json （）还将转换非对象，例如 null 和 undefined 无效的JSON。

The methods are identical when an object or array is passed, but res.json() will also convert non-objects, such as null and undefined, which are not valid JSON.

该方法还使用 json replaceacer 和 json spaces 应用程序设置，因此您可以使用更多选项格式化JSON。这些选项设置如下：

The method also uses the json replacer and json spaces application settings, so you can format JSON with more options. Those options are set like so:

app.set('json spaces', 2);
app.set('json replacer', replacer);

并传递给一个 JSON.stringify（）像这样：

JSON.stringify(value, replacer, spacing);
// value: object to format
// replacer: rules for transforming properties encountered during stringifying
// spacing: the number of spaces for indentation

这是发送方法没有的 res.json（）方法中的代码有：

This is the code in the res.json() method that the send method doesn't have:

var app = this.app;
var replacer = app.get('json replacer');
var spaces = app.get('json spaces');
var body = JSON.stringify(obj, replacer, spaces);

该方法最终作为 res.send（）最后：

this.charset = this.charset || 'utf-8';
this.get('Content-Type') || this.set('Content-Type', 'application/json');

return this.send(body);

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