How to fix ERR invalid number of arguments for 'get' command in Redis

Every Redis command has a specific number of required and optional arguments. Visit the official Redis documentation (redis.io/commands) to verify the exact syntax for your command.

Example: GET command syntax is:

GET key

It requires exactly one argument (the key). If you're using a different command, check its documentation.

Use the redis-cli interactive terminal to test your command. The redis-cli environment shows argument parsing clearly.

# Start redis-cli
redis-cli

# Test the GET command
> GET mykey
(nil)

# This will fail with error
> GET
(error) ERR wrong number of arguments for 'get' command

# This will also fail
> GET key1 key2
(error) ERR wrong number of arguments for 'get' command

Review how you're calling Redis commands in your code. Common mistakes:

JavaScript/Node.js example:

// WRONG - missing the key argument
redis.get((err, value) => { });

// CORRECT - include the key
redis.get('mykey', (err, value) => { });

Python example:

# WRONG - too many arguments
r.get('key1', 'key2')

# CORRECT - one key argument
r.get('mykey')

In redis-cli, use the HELP command to quickly see the exact syntax for any command:

> HELP GET
  GET key
  summary: Get the value of a key
  since: 1.0.0
  group: string

This shows that GET takes exactly one argument: a key.

Once you've confirmed the correct syntax, update your application code. Make sure:

1. You're passing the correct number of arguments
2. Arguments are in the right order
3. No extra spaces or typos are present
4. You're using the right command name

Example fix:

// Before (error)
await redis.get();

// After (correct)
await redis.get('username');