
Opal: Running Ruby in the JavaScript Runtime (Without Losing Your Mind)
April 29, 2026
Ruby has always been a server-first language. But what if you could take Ruby beyond MRI and run it directly in the browser, or even on the edge?
That’s exactly what Opal enables.
Opal is not just a transpiler. It’s a full Ruby execution environment implemented in JavaScript, capable of compiling Ruby code into JS and running it with a custom runtime that emulates Ruby’s object model, core classes, and method dispatch.
This opens the door to a very different way of thinking about Ruby applications.

Top comments (0)