Deserialize JSON array into list of objects

apexjson

I'm getting a JSON array from a REST callout:

[{\"name\":\"Jan0\",\"lastName\":\"Test0\",\"id\":0},
 {\"name\":\"Jan1\",\"lastName\":\"Test1\",\"id\":1},
 {\"name\":\"Jan2\",\"lastName\":\"Test2\",\"id\":2},
 {\"name\":\"Jan3\",\"lastName\":\"Test3\",\"id\":3}]

This gives me an error:

 List<Object> objs = (List<Object>)JSON.deserializeUntyped(res.getBody());

FATAL_ERROR System.TypeException: Invalid conversion from runtime type String to List

Ouch. Did I serialize the JSON incorrectly, or am I doing a mistake at covnerting the JSOn to the List?

Best Answer

Looks like the payload got serialized twice somehow. Ideally you would fix that so it is serialized just once instead. However, you can fix it in the interim by deserializing first into a String, then into your List<Object>.

String payload = (String)JSON.deserializeUntyped(response.getBody());
List<Object> data = (List<Object>)JSON.deserializeUntyped(payload);

Related Solutions

[SalesForce] Invalid conversion from runtime type LIST to MAP

If the response type is known and this is going to be an ongoing process, would creating a response class for that make sense?

public class MockResponse{
  public String Id;
  public String Name;
}
...
List<MockResponse> responseList = (List<MockResponse>)JSON.deserialize(res.getBody(), MockResponse.class);

[SalesForce] How to store and JSON-serialize Map of Objects AND SObjects

Try adding this instead of your last line of code:

String jsonstr = (String)JSON.serialize(parameters.get('SObject'));
SObject restoredAcme = (Account)JSON.deserialize(jsonstr, Account.class);

The problem with what you're currently trying to do is that you're essentially trying to cast a Map to an Account - which as you've seen, you cannot do.

As a workaround, you can serialize the Map to String and then deserialize that String to an Account.

Best Answer

Related Solutions

[SalesForce] Invalid conversion from runtime type LIST to MAP

[SalesForce] How to store and JSON-serialize Map of Objects AND SObjects

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