I have a JSON string:

{addressDetails=({addressId=56941, addressLine1=76 Kilaben Rd, addressLine2=null, addressLine3=null, addressType=H, countryCode=AUS, locality=KILABEN BAY, postcode=2283, sortplan=017, state=NSW, ...}), aliasName=null, concessionInfo=null, contactDate=null, contactDetails=({contactDetail=, contactId=122827, contactType=H, delta=2}), contactPreference={correspondanceLevel=0, correspondanceLevelDescription=null, emailOpt=N, smsOpt=N}, deceasedFlag=N, dob=1952-07-29T00:00:00, firstContactDate=null, firstName=John, ...}

I'm mapping this using:

Map<String, Object> meta = (Map<String, Object>) JSON.deserializeUntyped(viewPersonValue);

To get firstname I'd say:


The issue I'm facing is accessing the values in addressDetails.

I've tried addressDetails[0] and addressDetails.addressId but I think I'm approaching this wrong.

Any help would be greatly appreciated.


You are really working uphill by doing this all untyped, but you can get the value you want this way:

list<Object> l = (list<Object>) meta.get('addressDetails');
map<String,Object> m = (map<String,Object>) l[0];
Integer i = (Integer) m.get('addressId');

Honestly, if you make use of the Apex type system, you will have an easier time working with the data. If you create a class for the incoming data structure, abbreviated as:

public class Meta{
   public list<addressDetail> addressDetails {get; set;} 

   public class addressDetail{
       public Integer addressId {get; set;}

you will be able to access the data from your JSON strings as so:

Meta MyMeta = (Meta) JSON.deserialize(viewPersonValue,Meta.class);
  • Hi Martin, thanks for the response but when I say: system.debug(meta.get('addressDetails')[0].get('addressId')); I'm getting Error: Compile Error: Expression must be a list type: Object at line 79 column 23 – Corey May 18 '17 at 6:30
  • Are you able to quickly explain how you would convert the map to string to prevent further issues? Thank you so much as well for your help :) – Corey May 18 '17 at 6:49

May be this simple example can help

string viewPersonValue = '{"name":"John",

Map<String, Object> meta = (Map<String, Object> JSON.deserializeUntyped(viewPersonValue);
Map<String, Object>  carMap = (Map<String, Object>) meta.get('cars');
  • Getting this error: Invalid conversion from runtime type List<ANY> to Map<String,ANY> Error is in expression '{!parseNew}' in page Find_Person: Class.findPerson.parseNew: line 79, column 1 This is my code: Map<String, Object> meta = (Map<String, Object>) JSON.deserializeUntyped(viewPersonValue); Map<String, Object> addressDetailsMap = (Map<String, Object>) meta.get('addressDetails'); system.debug(addressDetailsMap.get('addressId')); – Corey May 18 '17 at 6:42

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