JavaScript Code
Output 
 
    
 
A Safe Place to Run JavaScript
 

Sometimes you just need to test a quick idea — a utility function, a sorting algorithm, or some
      string manipulation. Opening DevTools works, but the console is cramped and you lose your code on refresh.
      This runner gives you a proper editor with syntax highlighting and runs your code in a sandboxed iframe,
      so it can't affect the page.

 
What You Can Do
 
     
  • Write and test functions with console.log output
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  • Prototype algorithms before putting them in your project
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  • Debug tricky logic with quick experiments
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  • Share code snippets — your code stays in the editor between visits
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How It Works
 

Your code runs inside a sandboxed <iframe> with its own execution context.
      Console output is captured and displayed in the output panel. If your code throws, you'll see the
      error with a stack trace. The sandbox prevents your code from accessing the parent page.