Get lengths of the JSON string values at the path.
Syntax
JSON.STRLEN <key> [path]
key (required) – key of JSON document type
path (optional) – a JSON path. Defaults to the root if not provided
Return
If the path is enhanced syntax:
Array of integers, representing the length of string value at each path.
-
If a value is not a string, its corresponding return value is null.
-
Null if the document key does not exist.
If the path is restricted syntax:
Integer, the string's length.
If multiple string values are selected, the command returns the first string's length.
-
WRONGTYPEerror if the value at the path is not a string. -
NONEXISTENTerror if the path does not exist. -
Null if the document key does not exist.
Examples
Enhanced path syntax:
127.0.0.1:6379> JSON.SET k1 $ '{"a":{"a":"a"}, "b":{"a":"a", "b":1}, "c":{"a":"a", "b":"bb"}, "d":{"a":1, "b":"b", "c":3}}'
OK
127.0.0.1:6379> JSON.STRLEN k1 $.a.a
1) (integer) 1
127.0.0.1:6379> JSON.STRLEN k1 $.a.*
1) (integer) 1
127.0.0.1:6379> JSON.STRLEN k1 $.c.*
1) (integer) 1
2) (integer) 2
127.0.0.1:6379> JSON.STRLEN k1 $.c.b
1) (integer) 2
127.0.0.1:6379> JSON.STRLEN k1 $.d.*
1) (nil)
2) (integer) 1
3) (nil)
Restricted path syntax:
127.0.0.1:6379> JSON.SET k1 $ '{"a":{"a":"a"}, "b":{"a":"a", "b":1}, "c":{"a":"a", "b":"bb"}, "d":{"a":1, "b":"b", "c":3}}'
OK
127.0.0.1:6379> JSON.STRLEN k1 .a.a
(integer) 1
127.0.0.1:6379> JSON.STRLEN k1 .a.*
(integer) 1
127.0.0.1:6379> JSON.STRLEN k1 .c.*
(integer) 1
127.0.0.1:6379> JSON.STRLEN k1 .c.b
(integer) 2
127.0.0.1:6379> JSON.STRLEN k1 .d.*
(integer) 1
