\'Expected BEGIN_ARRAY but was BEGIN_OBJECT\': Why Is My JSON Parsing Error Occuring?

"Expected BEGIN_ARRAY but was BEGIN_OBJECT": Unraveling JSON Parsing Error

When dealing with JSON data manipulation, encountering errors like "Expected BEGIN_ARRAY but was BEGIN_OBJECT" can be frustrating. To understand the cause and find a solution, let's dive into the specific error scenario:

The error arises when you attempt to parse a JSON response into an array of objects, but the actual response is an object. The following code snippet illustrates this issue:

<code class="java">Gson gson = new GsonBuilder().setDateFormat("M/d/yy hh:mm a").create();
List<Post> postsList = Arrays.asList(gson.fromJson(reader, Post[].class));</code>

Here, postsList is expected to hold a collection of Post objects, yet the JSON response received is merely a single Post object:

<code class="json">{
  "dstOffset" : 3600,
  "rawOffset" : 36000,
  "status" : "OK",
  "timeZoneId" : "Australia/Hobart",
  "timeZoneName" : "Australian Eastern Daylight Time"
}</code>

To resolve this mismatch, modify your code to account for the single object structure:

<code class="java">Post post = gson.fromJson(reader, Post.class);</code>

By converting the JSON directly into a single Post object, you align your data structure with the actual JSON response format, eliminating the error.

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