Creating dynamic json

Mule ESB has multiple options to create dynamic payload. The payload used in Mule
can be of multiple types like JSON, XML or simple Text payload.
With Mule we can dynamically generate any type of payload at any point of time in
the flow.
We will see how to create a simple JSON payload dynamically within a Mule flow and
post that JSON to an external service and get a response.
It’s quite simple and we will see how we can generate a JSON in a flow.

Let us consider we need to create a JSON file as following :-
{
"myService": {
"messageHeader": {
"messageId": "ec75da88e64a739e12c126",
"messageDateTime": "2014-09-18T14:07:46+0530"
},
"mesageBody": {
"myServiceRequest": {
"Amount": 3520,
"ConsumerId": "ABC-T14005-AFF",
"Timestamp": "2014-10-27T18:36:18+0700"
}
}
}
}
Now, we need to create this flow in our Mule flow and send the JSON request created to the
external service and will get a response. We will assign the JSON elements value from flow
variables for now, but you can use message inbound properties or other ways to assign the
flow variables dynamically within the flow.

We will use Mule Expression Transformer to create this JSON request. As per Mule
documentation here
https://developer.mulesoft.com/docs/display/current/Expression+Transformer+Referenc
e :-
The Expression Transformer executes one or more expressions on the current message.
The results of these expressions becomes the payload of the current message.

Let’s consider our Mule flow as following :-
Here you can see, the expression transformer is creating the JSON request which is send to the
external web service. The flow variables are used to set the value and you can assign the variables
dynamically in your way.

Now let’s test our flow by placing by hitting the url http://localhost:8085/rc/test
on browser as follows, :-
The JSON request will be generated in the flow and with that request it will be
posted to the external web service which will return a response

Now, we can see in our logger the JSON request generated and the JSON response from
the external service in return :-

So, here you can see how to set a Dynamic JSON and can be send to the external
service to get a response…. you can try this with your requirement as well and set
the value dynamically in the flow variables or can use other dynamic options like
inbound properties etc !!!….

In my next slide I will bring some other techniques in Mule implementation .
Hope you have enjoyed this simpler version.
Keep sharing your knowledge and let our Mule community grow 

Creating dynamic json

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