Node JS 服务中的 JSON 到 XML 转换(使用 xml2js) [英] JSON to XML conversion in Node JS service (using xml2js)

问题描述

我需要一些有关 Node js 中 JSON 到 XML 转换的帮助/建议.我有一个服务，它在需要转换为 XML 的请求正文中获取一个 JSON 对象.我能够使用 node-xml2js 实现这一点，用于最多一层嵌套对象的 json 输入.但是，对于具有属性值的嵌套对象，它会变得更加复杂.属性应该首先被识别，在通过 xml2js 解析之前以 $ 符号为前缀并用花括号括起来得到正确的xml.有没有更好的方法可以简化这个重新格式化json输入的复杂层?xml2js 可以转换:

I need some help/advice with JSON to XML conversion in Node js. I have a service that gets a JSON object in request body that needs to convert to XML. I am able to achieve this using node-xml2js for json inputs with maximum one level of nested objects. But, it gets way more complicated with nested objects having attribute values. Attributes should be identified first, prefixed with $ sign and enclosed in curly braces before parsing through xml2js to get correct xml. Is there a better way of doing this where this complicated layer of reformatting the json input can be simplified? xml2js can converts this:

{
    "Level1":{  "$":{   "attribute":"value" },
                "Level2": {"$":{"attribute1":"05/29/2020",
                            "attribute2":"10","attribute3":"Pizza"}}
}

对此:(这是正确的):

to this:(which is correct):

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Level1 attribute="value">
  <Level2 attribute1="05/29/2020" attribute2="10" attribute3="Pizza"/>
</Level1>

但实际的 json 输入是这样的:

But actual json input is this:

{
    "Level1":{"attribute":"value",
              "Level2": {"attribute1":"05/29/2020",
                         "attribute2":"10","attribute3":"Pizza"} }
}

预期相同的结果:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Level1 attribute="value">
  <Level2 attribute1="05/29/2020" attribute2="10" attribute3="Pizza"/>
</Level1>

如果您曾处理过类似的要求，请告诉我.感谢任何帮助.谢谢你.

Please let me know if you have worked on similar requirements. Appreciate any help. Thank you.

推荐答案

这将是一种将对象改回库中预期格式的方法，尽管它假定所有非对象键都应该是属性(是这是您的应用程序的有效假设吗?)

This would be a way to change the object back to the format expected in the library, although it assumes that all non object keys are supposed to be attributes (is that a valid assumption for your application?)

function groupChildren(obj) {
  for(prop in obj) {
    if (typeof obj[prop] === 'object') {
      groupChildren(obj[prop]);
    } else {
      obj['$'] = obj['$'] || {};
      obj['$'][prop] = obj[prop];
      delete obj[prop];
    }
  }

  return obj;
}

然后像这样使用:

var xml2js = require('xml2js'); 
var obj = {
  Level1: {
    attribute: 'value',
    Level2: {
      attribute1: '05/29/2020',
      attribute2: '10',
      attribute3: 'Pizza'
    }
  }
};

var builder = new xml2js.Builder();
var xml = builder.buildObject(groupChildren(obj));

打印出来:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Level1 attribute="value">
  <Level2 attribute1="05/29/2020" attribute2="10" attribute3="Pizza"/>
</Level1>

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