Report the length of the JSON String at `path` in `key`

[Examples](#examples)

## Required arguments

<details open><summary><code>key</code></summary> 

is key to parse.
</details>

## Optional arguments

<details open><summary><code>path</code></summary> 

is JSONPath to specify. Default is root `$`, if not provided. Returns null if the `key` or `path` do not exist.
</details>

## Return

JSON.STRLEN returns by recursive descent an array of integer replies for each path, the array's length, or `nil`, if the matching JSON value is not a string.
For more information about replies, see [Redis serialization protocol specification](/docs/reference/protocol-spec). 

## Examples

{{< highlight bash >}}
127.0.0.1:6379> JSON.SET doc $ '{"a":"foo", "nested": {"a": "hello"}, "nested2": {"a": 31}}'
OK
127.0.0.1:6379> JSON.STRLEN doc $..a
1) (integer) 3
2) (integer) 5
3) (nil)
{{< / highlight >}}

## See also

`JSON.ARRLEN` | `JSON.ARRINSERT` 

## Related topics

* [RedisJSON](/docs/stack/json)
* [Index and search JSON documents](/docs/stack/search/indexing_json)