Unlock Redis Power: How the New Module System Extends Functionality

Redis Labs announced a new Redis Module System, allowing deeper extensions beyond Lua scripts.

GraphicsMagick Image Processing Module

The graphicsmagick module adds image processing capabilities inside Redis, such as thumbnail creation and rotation.

Thumbnail command GRAPHICSMAGICK.THUMBNAIL mypic 64 64 – scales the image stored in key mypic to 64×64.

Rotate command GRAPHICSMAGICK.ROTATE mypic 90 – rotates the image in mypic by 90 degrees.

rxstrings String Extension Module

This module extends Redis string commands with operations like CHECKAND and PREPEND .

CHECKAND checks a key’s value against a given string and, if they match, executes a subsequent command.

Example:

SET mykey "Hello World"

CHECKAND mykey "Hello World" SET mykey "Hello Redis Modules"

After execution, GET mykey returns “Hello Redis Modules”.

PREPEND adds a string to the beginning of a key’s value.

Example:

SET mykey " World"

PREPEND mykey Hello

The result of GET mykey is “Hello World”.

Developing and Using Modules

Modules are written in C, compiled into shared libraries, and loaded into Redis via the --loadmodule /path/to/module.so startup option or a configuration file entry.

Redis aims to build an ecosystem where developers share modules on GitHub, and the Redis team curates high‑quality modules for users to adopt.