Why Am I Getting a 'Type Mismatch' Deserialization Error with My JSON Data?

JSON deserialization type mismatch error

In programming, encountering the "Unable to deserialize the current JSON object (for example: {"name":"value"})..." error is a common problem. This error occurs when the structure of the JSON data is inconsistent with the expected type defined in the code.

In the following code snippet:

<code class="language-csharp">    //jsonstring {"data":[{"target_id":9503123,"target_type":"user"}]}
    List<RootObject> datalist = JsonConvert.DeserializeObject<List<RootObject>>(jsonstring);</code>

The problem is with the deserialized type. This line attempts to deserialize the JSON string jsonstring into List<RootObject>, expecting an array of objects. However, the JSON data structure is an object, which has only one property called data, which contains an array of objects.

To solve this problem, the deserialized type needs to match the structure of the JSON data. In this case, the correct deserialization line would be:

<code class="language-csharp">    RootObject datalist = JsonConvert.DeserializeObject<RootObject>(jsonstring);</code>

JSON objects containing the datalist property (which holds an array of objects) can be deserialized correctly by declaring RootObject as data. This avoids type mismatch errors because now the expected type of the code is consistent with the actual structure of the JSON data.

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