RunJS
RunJS is a desktop application designed as an interactive JavaScript playground and scratchpad. It evaluates code automatically on every keystroke, providing instant feedback without requiring manual console logging. It integrates Node.js and browser environments, allowing developers to test snippets, experiment with TypeScript, transpile via Babel, fetch APIs, and install npm packages. It serves as an alternative to traditional browser consoles and REPLs for prototyping and testing.
Checked on Oct 18, 2026.
Alternative resources
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A debugging tool that displays console logs, runtime errors, and network requests directly in your code editor.
PyCharm
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Replit
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