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

问题描述

res.send 和 res.json 之间的实际区别是什么，因为两者似乎都执行相同的响应客户端的操作.

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

传递对象或数组时方法相同，但 res.json() 也会转换非对象，例如作为 null 和 undefined，它们不是有效的 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.

该方法还使用了 json 替换器 和 json 空间 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 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res.json()方法中send方法没有的代码:

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);

该方法以res.send()结尾:

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

return this.send(body);

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