Kotlin – Convert Json(String/File) to/from XML(String/File)

In the tutorial, we show how to convert Json to XML and vice versa in Kotlin language.

Json dependency

For convert Json to/from XML we use JSONObject, so we need a dependency:

  org.json
  json
  20180130

Kotlin – Convert Json to XML

Convert Json String to XML String

var jsonStr = "{\"Customer\": {" +
					    "\"address\": {" +
					        "\"street\": \"NANTERRE CT\"," +
					        "\"postcode\": 77471" +
					    "}," + 
					    "\"name\": \"Mary\"," +
					    "\"age\": 37" +
					"}}"

var json = JSONObject(jsonStr)
var xml = XML.toString(json)

println(xml)
/*
 	
NANTERRE CT77471
Mary37
*/

Convert Json File to XML file

val jsonFile = System.getProperty("user.dir") + "\\file.json"
val xmlFile = System.getProperty("user.dir") + "\\file.xml"

jsonStr = File(jsonFile).readText()
json = JSONObject(jsonStr)

File(xmlFile).writeText(XML.toString(json))

Kotlin – Full Program

package com.javasampleapproach.kotlin.jsonxml

import java.io.File
import org.json.JSONObject
import org.json.XML

fun main(args: Array) {
	// 1. Convert Json String -> XML String
	var jsonStr = "{\"Customer\": {" +
						    "\"address\": {" +
						        "\"street\": \"NANTERRE CT\"," +
						        "\"postcode\": 77471" +
						    "}," + 
						    "\"name\": \"Mary\"," +
						    "\"age\": 37" +
						"}}"
	
	var json = JSONObject(jsonStr)
	var xml = XML.toString(json)
	
	println(xml)
	/*
	 	
NANTERRE CT77471
Mary37
	 	
	 	--> pretty-print
	 	
		
		
		  

		    NANTERRE CT
		    77471
		  
		  Mary
		  37
		
	 */
	
	// 2. Convert Json File -> XML File
	val jsonFile = System.getProperty("user.dir") + "\\file.json"
	val xmlFile = System.getProperty("user.dir") + "\\file.xml"
	
    jsonStr = File(jsonFile).readText()
	json = JSONObject(jsonStr)
	
	File(xmlFile).writeText(XML.toString(json))
}

Kotlin – Convert XML to Json

Convert XML String to Json String

val PRETTY_PRINT_INDENT_FACTOR = 4

var xmlString = "" + 
		"  Mary" + 
		"  37" + 
		"  
" + 
		"    NANTERRE CT" + 
		"    77471" + 
		"  
" + 
		""

var xmlJSONObj = XML.toJSONObject(xmlString)
val jsonPrettyPrintString = xmlJSONObj.toString(PRETTY_PRINT_INDENT_FACTOR)

println(jsonPrettyPrintString)
/*
	{"Customer": {
	    "address": {
	        "street": "NANTERRE CT",
	        "postcode": 77471
	    },
	    "name": "Mary",
	    "age": 37
	}}
 */

Convert XML File to Json File

var xmlFile = System.getProperty("user.dir") + "\\file.xml"

xmlString = File(xmlFile).readText()
xmlJSONObj = XML.toJSONObject(xmlString)

val jsonFile = System.getProperty("user.dir") + "\\file.json"
File(jsonFile).writeText(xmlJSONObj.toString(PRETTY_PRINT_INDENT_FACTOR))

Kotlin – Full Program

package com.javasampleapproach.kotlin.jsonxml

import java.io.File
import org.json.JSONObject
import org.json.XML

fun main(args: Array) {
	// 1. Convert XML String -> Json String
	val PRETTY_PRINT_INDENT_FACTOR = 4
	
	var xmlString = "" + 
			"  Mary" + 
			"  37" + 
			"  
" + 
			"    NANTERRE CT" + 
			"    77471" + 
			"  
" + 
			""
	
	var xmlJSONObj = XML.toJSONObject(xmlString)
	val jsonPrettyPrintString = xmlJSONObj.toString(PRETTY_PRINT_INDENT_FACTOR)
	
	println(jsonPrettyPrintString)
	/*
		{"Customer": {
		    "address": {
		        "street": "NANTERRE CT",
		        "postcode": 77471
		    },
		    "name": "Mary",
		    "age": 37
		}}
	 */
    
    // 2. Convert XML File -> Json File
	var xmlFile = System.getProperty("user.dir") + "\\file.xml"
	
	xmlString = File(xmlFile).readText()
	xmlJSONObj = XML.toJSONObject(xmlString)
	
	val jsonFile = System.getProperty("user.dir") + "\\file.json"
	File(jsonFile).writeText(xmlJSONObj.toString(PRETTY_PRINT_INDENT_FACTOR))
}