Add and Update a node in XML File Using Nodejs

in this node tutorial, I’ll share a nodejs script to add and update a node in an XML file using nodejs. I am using nodejs fs module to read an XML file.

I have already shared xml parsing in json usin nodejs and Create XML File Using Nodejs xmlbuilder2.

What’s xmlbuilder2

xmlbuilder2 is a wrapper around a DOM implementation that includes chainable functions to make it easier to generate complicated XML documents. Function chaining naturally follows the structure of an XML document because it is a tree of nodes, resulting in more understandable source code.

What’s Nodejs fs Module

The fs module has a variety of helpful features for accessing and interacting with the file system.

It is not required to be installed. It can be utilized by just requiring it because it is part of the Node.js core:

var fs = require("fs")

Add A New Node in an XML FIle

We’ll create a new node in XML format and add it to an existing XML file.

Let’s create a deafult.xml file and read this file using readFile() method.

var filePath = `default.xml`;
fs.readFile(filePath, function(err, data) {
	parser.parseString(data, function (err, result) {
		result.Rules = {"Rule": {"$":{"name":"custom_rule"},"Condition":"customErrorCode != null and customErrorMessage != ' '","Step":{"Name":"Custom-Response", "Condition":"customErrorCode != null and customErrorMessage != ' '"}}};
		let xml = builder.buildObject(result);
		fs.writeFile(filePath, xml, function(err, data){
			if (err) console.log(err);
		});
	});
});

Update A Node Using Nodejs

Let’s update an existing node into an xml file. We’ll add properties and inner element in node using nodejs.

var filePath = `default.xml`;
fs.readFile(filePath, function(err, data) {
	parser.parseString(data, function (err, result) {
		result.Rule[0] = {"API": {"$":{"name":"get data"},"Step":{"Name":"get-Response"}}};
		let xml = builder.buildObject(result);
		fs.writeFile(filePath, xml, function(err, data){
			if (err) console.log(err);
		});
	});
});