Simon Willison’s Weblog

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25th December 2025

Research Redis JavaScript Module — Expanding Redis’s scripting capabilities, the Redis JavaScript Module enables users to execute JavaScript scripts in Redis through the fast, embedded mquickjs engine, paralleling the Lua scripting features but with a JavaScript syntax. This module introduces commands like `JS.EVAL`, `JS.LOAD`, and `JS.CALL`, supporting script execution, caching, and invocation by SHA1 hash, along with native integrations for running Redis commands, logging, and error handling within scripts.

I had Claude Code build an experimental Redis module for executing JavaScript code in a similar way to Lua using JS.EVAL and similar functions.

I was inspired to try this by this comment from antirez about how he would have used JavaScript in place of Lua as the embedded Redis scripting language if MicroQuickJS had been available in 2010.

Posted 25th December 2025 at 3:38 am

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