# JSON.ARRTRIM
<a name="json-arrtrim"></a>

Trim arrays at the path so that it becomes subarray [start, end], both inclusive.
+ If the array is empty, do nothing, return 0.
+ If start <0, treat it as 0.
+ If end >= size (size of the array), treat it as size-1.
+ If start >= size or start > end, empty the array and return 0.

Syntax

```
JSON.ARRINSERT <key> <path> <start> <end>
```
+ key (required) – key of JSON document type
+ path (required) – a JSON path
+ start (required) – start index, inclusive.
+ end (required) – end index, inclusive.

**Return**

If the path is enhanced syntax:
+ Array of integers, representing the new length of the array at each path.
+ If a value is an empty array, its corresponding return value is null.
+ If a value is not an array, its corresponding return value is null.
+ `OUTOFBOUNDARIES` error if an index argument is out of bounds.

If the path is restricted syntax:
+ Integer, the new length of the array.
+ Null if the array is empty.
+ `WRONGTYPE` error if the value at the path is not an array.
+ `OUTOFBOUNDARIES` error if an index argument is out of bounds.

**Examples**

 Enhanced path syntax:

```
127.0.0.1:6379> JSON.SET k1 . '[[], ["a"], ["a", "b"], ["a", "b", "c"]]'
OK
127.0.0.1:6379> JSON.ARRTRIM k1 $[*] 0 1
1) (integer) 0
2) (integer) 1
3) (integer) 2
4) (integer) 2
   127.0.0.1:6379> JSON.GET k1
   "[[],[\"a\"],[\"a\",\"b\"],[\"a\",\"b\"]]"
```

 Restricted path syntax:

```
127.0.0.1:6379> JSON.SET k1 . '{"children": ["John", "Jack", "Tom", "Bob", "Mike"]}'
OK
127.0.0.1:6379> JSON.ARRTRIM k1 .children 0 1
(integer) 2
127.0.0.1:6379> JSON.GET k1 .children
"[\"John\",\"Jack\"]"
```