JSON应该包含空值 [英] Should JSON include null values

问题描述

我正在创建一个以JSON格式返回结果的API。当值为null时，是否应该在结果中包含键，是否存在当前的最佳实践？例如：

I'm creating an API that returns results as JSON. Is there a current best practice for whether we should include keys in the result when the value is null? For example:

{
    "title":"Foo Bar",
    "author":"Joe Blow",
    "isbn":null
}

或

{
    "title":"Foo Bar",
    "author":"Joe Blow"
}

由于第二个是我倾向于这种风格，但我不确定是否有一个首选的风格。从客户的角度来看，似乎两种风格在功能上都是等同的。每个的优点或缺点是什么？

Since the second is smaller I am leaning towards this style, but I'm not sure if there is a preferred style or not. From a client perspective it seems like both styles would be functionally equivalent. Any pros or cons to each?

推荐答案

第二个会节省一小部分带宽，但如果这是一个问题你会也使用索引数组，而不是用键填充JSON。显然， [Foo Bar，Joe Blow] 比你现在的要短得多。

The second will save a small amount on bandwidth, but if that were a concern you would also use indexed arrays instead of filling the JSON with keys. Clearly, ["Foo Bar","Joe Blow"] is much shorter than what you have now.

在可用性方面，我认为它没有任何区别。在这两种情况下， if（json.isbn）将跳转到 else 。通常无需区分 null （无值）和 undefined （无给定值）。

In terms of usability, I don't think it makes any difference. In both cases, if(json.isbn) will skip to the else. There is usually no need to distinguish between null (no value) and undefined (no given value).

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