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I am having nearly 400+ fields in a object and during callout I have to send this fields in JSON body.

At present I am manually mapping the fields by keeping all the JSON fields in a object.So the clas itself is having nearly 400+ fields

So mapping like this

Health_SBP__c ----> fv_sbp
Health_DBP__c ----> fv_dbp
...

Not sure whether my mapping will create any performance issue?. Is there a batter way to map these 400 + fields?

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If you need to map those values, you'll have to deal with 400+ executions. A typical way to do this is to create a Field Map type object (e.g. as a Custom Metadata Type), grab the CMTs in to a list, and then iterate over those values as you create your JSON. This gives you a configurable way to add/remove fields without modifying code later. There's plenty of examples available on this site and around the Internet that go in to more detail on how to do this.

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