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JSREPL is entirely free and open-source. You can check the source code on GitHub.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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StackBlitz is a powerhouse, offering a full-featured development environment right in a browser, thanks to WebContainers. It's my top choice for testing large JavaScript/TypeScript code fragments or anything involving npm packages. The editor provides TypeScript types, even for installed npm packages, just like in your IDE.
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RunJS
RunJS is a JavaScript playground for macOS, Windows and Linux. Write code with instant feedback and access to Node.js and browser APIs.
Discovering RunJS was a game-changer for me. I love how it displays the result of each expression right next to the code. This makes testing snippets incredibly productive without the constant need for console.log or breakpoints.
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Console in Chrome DevTools has long been my go-to for quick JavaScript tests. No matter what site I'm on, I can open DevTools and run a snippet on the spot. While AI can answer many questions today, I still find myself turning to MDN, opening the DevTools Console, and verifying things firsthand.
