How to Use MGET in Redis: Syntax and Examples

Use the MGET command in Redis to get the values of multiple keys in one call by listing the keys separated by spaces. It returns an array of values corresponding to the keys, with null for keys that do not exist.

Syntax

The MGET command retrieves the values of multiple keys in a single call.

• MGET: The command name.
• key1 key2 ... keyN: List of keys you want to get values for.

The command returns an array of values in the same order as the keys. If a key does not exist, its value in the array is null.

redis

MGET key1 key2 key3

Example

This example shows how to set three keys and then retrieve their values using MGET. It demonstrates getting multiple values in one command and handling missing keys.

redis

SET name "Alice"
SET age "30"
SET city "Paris"
MGET name age city country

Output

OK
OK
OK
1) "Alice"
2) "30"
3) "Paris"
4) (nil)

Common Pitfalls

Common mistakes when using MGET include:

• Expecting a single value instead of an array of values.
• Not handling null values for keys that do not exist.
• Passing no keys, which returns an empty array.

Always check the returned array length and values to avoid errors in your application.

redis

MGET

# Wrong: No keys passed, returns empty array

MGET key1

# Right: Always pass keys and handle nulls
MGET key1 key2 key3

Output

1) (empty list or set)

1) "value1"

1) "value1"
2) (nil)
3) "value3"

Quick Reference

Command	Description
MGET key1 key2 ... keyN	Get values of multiple keys at once
Returns	Array of values or null for missing keys
Use case	Efficiently fetch multiple keys in one call

Key Takeaways

Use MGET to fetch multiple keys in one Redis call for efficiency.

MGET returns an array with values or null for missing keys.

Always handle null values to avoid errors in your application.

Passing no keys to MGET returns an empty array.

MGET is faster than multiple GET calls for multiple keys.