Wrong number of arguments for command
This is one of the most common errors in Redis, returned when a command is called with fewer or more arguments than it expects. The server-side check is strict and requires the exact number of arguments.
- 1A client library bug or misuse where a command wrapper is called incorrectly.
- 2Manual command execution with a typo in the number of parameters.
- 3An outdated client attempting to use a command whose signature has changed in a newer Redis version.
A client calls the 'SET' command with only a key and no value.
SET mykey
expected output
(error) ERR wrong number of arguments for 'set' command
Fix 1
Consult the command documentation
WHEN Immediately upon seeing this error
# For example, for SET SET mykey "myvalue" # For RPUSH RPUSH mylist "item1" "item2"
Why this works
The official Redis documentation for each command clearly specifies its required arguments. Correcting the call to match the documentation resolves the error.
Fix 2
Update your client library
WHEN If your code seems correct but the error persists
# Example for Node.js npm install redis@latest
Why this works
An outdated client might have an incorrect implementation of a command's argument structure. Updating to the latest version ensures compatibility.
✕ Keep adding or removing arguments randomly
This is inefficient and can lead to further errors. Always check the official command syntax first.
Server-side command argument validation
Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev