How to convert one field within large json to int instead of string

Question

Im collecting data via Salesforce inbound email services. I am sending data in json format : { "some_field" : "some_field_value"} with multiple fields.

Im using this code to make the insert:

NPS__c response = new NPS__c();
            
Map<String, String> m = (Map<String,String>) JSON.deserialize(JSON_from_email, map<String,String>.class);
for (String f : m.keySet()) {
    response.put(f, m.get(f));
}
insert response; 

where 'JSON_from_email' is obtained by getting the plain text body of an inbound email.

my problem is that one of the fields is an number field { "some_field" : 100 }.

This code fails " Illegal assignment from string to decimal"

I know what the problem is, this produces a string:

JSON.deserialize(splitted_surveys, map<String,String>.class);

how can i change this so that one specific value of the JSON becomes a number?

thanks!

Answer 1

Use JSON.deserializeUntyped instead (this gives you Map<String, Object> instead):

NPS__c response = new NPS__c();
Map<String, Object> m = (Map<String,Object>) JSON.deserializeUntyped(JSON_from_email);
for (String f : m.keySet()) {
  response.put(f, m.get(f));
}
insert response; 

Also, if the payload already has the correct format, you should also be able to:

NPS__c response = (NPS__c)JSON.deserialize(JSON_from_email, NPS__c.class);
insert response;

The latter automatically supports most field types, including Date, Time, Boolean, Numbers, and Strings.