JSON to XML conversion using WSO2 ESB

I am using WSO2 ESB 4.6.0 version to demonstrate this sample, simple yet powerful.

You do not need to write your own code or relay on other library to convert json to xml. Simple WSO2 esb proxy can do the conversion for you, so we will try that. 

Lets set the requirement is to use a parameter to the methods to control whether to return JSON or XML. 

Given synapse configuration below has the very basic configuration to solve this requirement.

	<?xml version="1.0" encoding="UTF-8"?>
	<definitions xmlns="http://ws.apache.org/ns/synapse">
	<registry provider="org.wso2.carbon.mediation.registry.WSO2Registry">
	<parameter name="cachableDuration">15000</parameter>
	</registry>
	<sequence name="fault">
	<log level="full">
	<property name="MESSAGE" value="Executing default 'fault' sequence"/>
	<property name="ERROR_CODE" expression="get-property('ERROR_CODE')"/>
	<property name="ERROR_MESSAGE" expression="get-property('ERROR_MESSAGE')"/>
	</log>
	<drop/>
	</sequence>
	<sequence name="main">
	<in>
	<log level="full"/>
	<filter source="get-property('To')" regex="http://localhost:9000.*">
	<send/>
	</filter>
	</in>
	<out>
	<send/>
	</out>
	<description>The main sequence for the message mediation</description>
	</sequence>
	<api name="JsonToXmlApi" context="/Test">
	<resource methods="POST" uri-template="/xml/">
	<inSequence>
	<property name="messageType" value="text/xml" scope="axis2"/>
	<header name="To" action="remove"/>
	<property name="RESPONSE" value="true" scope="default" type="STRING"/>
	<send/>
	</inSequence>
	</resource>
	<resource methods="POST" uri-template="/json/">
	<inSequence>
	<property name="messageType" value="application/json" scope="axis2"/>
	<header name="To" action="remove"/>
	<property name="RESPONSE" value="true" scope="default" type="STRING"/>
	<send/>
	</inSequence>
	</resource>
	</api>
	</definitions>

view raw synaspeJsontoXmlAPI.xml hosted with ❤ by GitHub

"JsonToXmlApi" rest api has two resource in the "Test" context. "/xml/" resource will covert the incoming json payload into xml format and send that back to client. whereas,  "/json/" resource without converting which will echo back to the client.

You can test this using curl commands that have given below,

	curl -i -H "Content-Type: application/json" -X POST -d '{
	"peoples": {
	"people": [
	{
	"class": "Person",
	"name": "vanjikumaran",
	"birthday": "today",
	"nickname": "Oracle of Omaha",
	"phonNumbers": {
	"phonNumber": [
	{
	"class": "Phone",
	"name": "cell",
	"number": "555-123-4567"
	},
	{
	"class": "Phone",
	"name": "home",
	"number": "555-987-6543"
	},
	{
	"class": "Phone",
	"name": "work",
	"number": "555-678-3542"
	}
	]
	}
	},
	{
	"class": "Person",
	"name": "Steven Jobs",
	"birthday": "Yesterday",
	"nickname": "Steve",
	"phonNumbers": {
	"phonNumber": [
	{
	"class": "Phone",
	"name": "cell",
	"number": "555-123-4567"
	},
	{
	"class": "Phone",
	"name": "home",
	"number": "555-987-6543"
	},
	{
	"class": "Phone",
	"name": "work",
	"number": "555-678-3542"
	}
	]
	}
	}
	]
	}
	}' http://localhost:8280/Test/json/

view raw curlRequestjson hosted with ❤ by GitHub

	curl -i -H "Content-Type: application/json" -X POST -d '{
	"peoples": {
	"people": [
	{
	"class": "Person",
	"name": "vanjikumaran",
	"birthday": "today",
	"nickname": "Oracle of Omaha",
	"phonNumbers": {
	"phonNumber": [
	{
	"class": "Phone",
	"name": "cell",
	"number": "555-123-4567"
	},
	{
	"class": "Phone",
	"name": "home",
	"number": "555-987-6543"
	},
	{
	"class": "Phone",
	"name": "work",
	"number": "555-678-3542"
	}
	]
	}
	},
	{
	"class": "Person",
	"name": "Steven Jobs",
	"birthday": "Yesterday",
	"nickname": "Steve",
	"phonNumbers": {
	"phonNumber": [
	{
	"class": "Phone",
	"name": "cell",
	"number": "555-123-4567"
	},
	{
	"class": "Phone",
	"name": "home",
	"number": "555-987-6543"
	},
	{
	"class": "Phone",
	"name": "work",
	"number": "555-678-3542"
	}
	]
	}
	}
	]
	}
	}' http://localhost:8280/Test/xml/

view raw curlRequestxml hosted with ❤ by GitHub