Rest API Errors in Salesforce

Below are the some of the errors we will receive while doing REST API integration

1.|FATAL_ERROR|System.JSONException: Can not deserialize SObject out of START_ARRAY token at [line:1, column:1]

2{"errorCode":"APEX_ERROR","message":"System.JSONException: Unexpected character ('C' (code 67)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') at input location [1,2]\n\n(System Code)\line 28, column 1"}

3.Malformed JSON: Expected '[' at the beginning of List/Set

4.Unexpected character ('C' (code 67)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') at input location [1,2]