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There is a new project called [Attempt This Online](https://ato.pxeger.com/) intended as an alternative to TIO. It's pretty nascent so doesn't yet support the same volume of languages as TIO and the only version of JavaScript currently available is Node.
Other than that, here are _plenty_ of tools available online for writing & running client-side languages like JavaScript, although they're not specifically geared towards golfing. Personally, I'm partial to [CodePen](https://codepen.io/) but there's also the likes of [JSFiddle](http://jsfiddle.net/) & [JS Bin](https://jsbin.com/).

There is a new project called [Attempt This Online](https://ato.pxeger.com/) intended as an alternative to TIO. It's pretty nascent so doesn't yet support the same volume of languages as TIO and the only version of JavaScript currently available is Node.
Other than that, there are _plenty_ of tools available online for writing & running client-side languages like JavaScript, although they're not specifically geared towards golfing. Personally, I'm partial to [CodePen](https://codepen.io/) but there's also the likes of [JSFiddle](http://jsfiddle.net/) & [JS Bin](https://jsbin.com/).