*** a/contrib/auto_explain/auto_explain.c
--- b/contrib/auto_explain/auto_explain.c
***************
*** 299,304 **** explain_ExecutorEnd(QueryDesc *queryDesc)
--- 299,311 ----
  			if (es.str->len > 0 && es.str->data[es.str->len - 1] == '\n')
  				es.str->data[--es.str->len] = '\0';
  
+ 			/* Fix JSON to output an object */
+ 			if (auto_explain_log_format == EXPLAIN_FORMAT_JSON)
+ 			{
+ 				es.str->data[0] = '{';
+ 				es.str->data[es.str->len - 1] = '}';
+ 			}
+ 
  			/*
  			 * Note: we rely on the existing logging of context or
  			 * debug_query_string to identify just which statement is being