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How to convert json array to json?

I am New to APEX programming language.I am having JSON Array string i only need to convert it into JSON Object i.e I need to remove [] from the array. Example:

[{"Attributes":
 {"Type":"Account","url";"/servicec/data/v4.0"},"LastModified":"2017-05-05"}]

I need to Convert Above Json Array to 

{"Attributes":
{"Type":"Account","url";"/servicec/data/v4.0"},"LastModified":"2017-05-05"}
Solution 
  • List<Object> arr =(List<Object>)JSON.deserializeUntyped(jsonInput);
String firstemement = arr[0];