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APPEND

Last updated 
APPEND key value
Group
String
Complexity
O(1) amortized
Arity
3 (exactly, counting the command name)
Flags
write, fast
Keys
first 1, last 1, step 1
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APPEND adds value to the end of the string at key. When the key does not exist it is created with value as its content, as SET would. The key keeps its time to live.

Return value

Section titled “Return value”
Case RESP2 RESP3
Always Integer: the length of the string after the append Integer

Errors:

  • WRONGTYPE when the key holds a value that is not a string.
  • ERR string exceeds maximum allowed size (proto-max-bulk-len) when the result would be longer than proto-max-bulk-len (512 MB by default).

Examples

Section titled “Examples”
127.0.0.1:6379> APPEND log "boot;"
(integer) 5
127.0.0.1:6379> APPEND log "ready;"
(integer) 11
127.0.0.1:6379> GET log
"boot;ready;"

Compatibility

Section titled “Compatibility”

Same as Redis 7 and Valkey 8.

See also

Section titled “See also”

SETRANGE, STRLEN, GETRANGE, SET