JSOn body for property with null value

Hi all,
I’m having an issue while designing the mapping property with null value for my JSON object. For example I have a Mapper to map $input to $body with the expression like follow:
{“my_id”: $input.Id,
“my_name”: $input.Name,
“my_address”: $input.Address
When the $input is {“Id”: 123,“Name”: null, “Address”: “A Street, B District, C City”}, the $body should be: {“my_id”: 123,
“my_name”: null,
“my_address”: “A Street, B District, C City”
}. But when the $input is {“Id”: 123, “Address”: “A Street, B District, C City”}, the $body should be:
{“my_id”: $input.Id,
“my_address”: $input.Address
}. I tried with hasOwnProperty() and hasPath(), but they all treats the null value as not existing property, so it will not work.

Does anyone know how can I keep the null value for mapping, but eliminate property that does not exist in the $input. Thank you in advanced.
best regards.

Hi @nluu,

You can try the following expression:

$input.mapKeys((v,k)=> "my_"+k.toLowerCase())

I believe it should do the work.


Hi @bojanvelevski,

thank you for your response. It actually a very good solution. But in my case, the name is not always in the format of “my_” + key. The name will depends on the naming I agreed with the Database team and the CRM team, so sometime it will be like “close_date”: $input.ProductEffectiveDate_c etc. But I’ll try to base on your suggestion to find out the solution. Thank you so much

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