'xml2js not writing as expected

Given this XML layout:

<config>
  <Nightly>
    <VersionNumber>1.10.0</VersionNumber>
  </Nightly>
</config>

And this code (based on this article):

NewVersionNumber = '1.10.1';

fs.readFile("../config.xml", "utf-8", (err, data) => {

xml2js.parseString(data, (err, result) => {
    result.config.Nightly.VersionNumber = NewVersionNumber;

    const builder = new xml2js.Builder();
    const xml = builder.buildObject(result);

    fs.writeFile('../config.xml', xml, (err) => {
        if (err) {
            throw err;
        }
    });
});

I'm getting this result:

<config>
  <Nightly>
    <VersionNumber>1.10.0</VersionNumber>
  </Nightly>
  <Nightly>1.10.1</Nightly>
</config>

What am I doing wrong? The goal is for it to update the config.Nightly.VersionNumber value.

node.jsjsonxmlxml2js


Solution 1:[1]

try using explicitArray:false params:

xml2js.parseString(data, {explicitArray:false}, (err, result) => {

see here:

explicitArray (default: true): Always put child nodes in an array if true; otherwise an array is created only if there is more than one.

https://www.npmjs.com/package/xml2js#options

Solution 2:[2]

So I fixed the issue by simply adding [0] to each element:

result.config.Nightly[0].AppName[0] = message.AppName;
result.config.Nightly[0].VersionNumber[0] = message.VersionNumber;
result.config.Nightly[0].Branch[0] = message.Branch;

I'm posting this as an answer because it fixed it, but I'd love to see other answers or explanations.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 traynor
Solution 2 THE JOATMON

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