HSTRLEN
HSTRLEN key field
Returns the string length of the value associated with field in the hash stored at key. If the key or the field do not exist, 0 is returned.
Return value
Integer reply: the string length of the value associated with field, or zero when field is not present in the hash or key does not exist at all.
Examples
 redis>  HMSET myhash f1 HelloWorld f2 99 f3 -256 
  "OK" redis>  HSTRLEN myhash f1 (integer) 10 redis>  HSTRLEN myhash f2 (integer) 2 redis>  HSTRLEN myhash f3 (integer) 4
    © 2009–2020 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
    https://redis.io/commands/hstrlen