JSON how to ignore missing object during deserialization

Question

I have a sample JSON that when i deserialize i get "object reference not set to instance of an object" because i found out some that sometimes the field is missing then it will reappear again.

the json is similar to this

{
    "title": "Example",
    "type": "object",
    "properties": {
        "firstName": {
            "type": "string"
        },
        "lastName": {
            "type": "string"
        },
        "age": {
            "description": "Age in years",
            "type": "integer",
            "minimum": 0
        }
    }

}

if i deserialize this and map it to the corresponding fields the result is OK

but if for example the "Age" is missing

{
    "title": "Example",
    "type": "object",
    "properties": {
        "firstName": {
            "type": "string"
        },
        "lastName": {
            "type": "string"
        },
    },
    "required": ["firstName", "lastName"]
}

it will throw an error "object reference not set to instance of an object" how do i ignore the age if it's missing in JSON?

if its real POCO object I check if this any property there with null, I assigned then with blank object. like if(MyObject.Properties.Age==null) { MyObject.Properties.Age = new Age();} then deserialize it. — Deepak Sharma
– Deepak Sharma, Commented Jun 19, 2015 at 2:25
The "Age" should be null in your case. What is your lib version? V6.0.8 works in a similar case. — hazjack
– hazjack, Commented Jun 19, 2015 at 2:43
i tried adding new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore}); at the end of deserialization it still throws an error. — Nevi
– Nevi, Commented Jun 19, 2015 at 2:44

Deepak Sharma · Accepted Answer · 2015-06-19 02:31:51Z

2

Update when you said you using json.net

I will say there is setting for Json.net try the below

JsonSerializerSettings.NullValueHandling = NullValueHandling.Ignore

if its real POCO object, I check if any property there with null, I assigned then with blank object. like

if(MyObject.Properties.Age==null)
{
   MyObject.Properties.Age = new Age();
}

then deserialize it.

edited Jun 19, 2015 at 2:31

answered Jun 19, 2015 at 2:26

Deepak Sharma

4,1801 gold badge17 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Nevi Over a year ago

do i add this on my class?

Nevi Over a year ago

[JsonProperty("age", NullValueHandling = NullValueHandling.Ignore)]

Deepak Sharma Over a year ago

yes... you can add either way.. i mean either add as attribute on property of 'AGE' or whatever it is.. or you can set the centralize for all using JsonSerializerSetting static class.

Collectives™ on Stack Overflow

JSON how to ignore missing object during deserialization

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related