Why can we get the error: System.JSONException: Illegal value for primitive?

1.6K    Asked by BrianKennedy in Salesforce , Asked on Aug 30, 2023

 I intend to parse a JSON response into a custom class. I have used a class and constructor. My motive is to parse the content into the class fields. But I am getting the error that shows: System.JSONException: Illegal value for primitive. Why am I getting such an error? 

Answered by Danna sahi

 I suggest you consider making some changes in the Shipments class. You can write down the following line of code: 

public Boolean archived; public Boolean updating;  Moreover, you can face problems with transit_time and stay_time, which should be integer but may return a string. 

If an object has other objects, you need to use inner classes for the present objects, and if you have created an array to out your data, you can use the following code: 



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The error **"System.JSONException: Illegal value for primitive"** usually occurs in Salesforce when there's a mismatch in data types while handling JSON parsing. For example, if a JSON object expects a numeric value but receives a string, this error can arise. It's crucial to ensure that the data type in your JSON string matches the expected data type in your Apex class. A common solution is validating the JSON structure before parsing or using type conversion techniques to align the data types.



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