Welcome toRunJavascript

Your free go-to online playground for developers of all levels.

Whether you're honing your DSA skills, experimenting with new ideas, or need a quick scaffold for your next project, we've got you covered.

Key Features:

HTML, CSS, and JavaScript: Seamless and instant runtime for your front-end experiments.
TypeScript: Elevate your coding with static typing and modern features.

No installations. No distractions. Just code, learn, and grow—all for free.

SUPPORT US

function sum(...args1) {
  let result = 0;
  
  if(args1.length > 0) {
    result = args1.reduce((acc, cur) => {
      return acc+cur
    }, 0)
  }

  return function inner(...args2) {
    if(args2.length === 0) {
      return result
    }
    if(args2.length > 0) {
      result = result + args2.reduce((acc, cur) => {
        return acc+cur
      }, 0)
    }
    return inner
  }
}

console.log(sum(2,4)(4)()) // 10

Features

Everything you need to code with confidence

RunJavascript provides a powerful set of tools to help you write, test, and debug your JavaScript code efficiently.

Instant Execution

Write and run JavaScript code in real-time with immediate feedback.

Multiple File Support

Create and manage multiple files for complex projects and experiments.

Collaborative Coding

Share your code and collaborate with other developers in real-time.

Cross-Browser Compatibility

Test your code across different browsers and environments.

How It Works

Simple steps to get you coding

Start coding in minutes with our intuitive platform designed for developers of all skill levels.

Write Code

Use our sleek editor with syntax highlighting and auto-completion

Step 1

Run Instantly

Execute your code with a single click and see results immediately

Step 2

View Output

Check your console output and debug with ease

Step 3

What our users are saying

RunJavascript has been a game-changer for my coding practice. It's so easy to use and the instant feedback is invaluable.

Sarah Johnson

Frontend Developer

As a coding instructor, I recommend RunJavascript to all my students. It's the perfect platform for learning and experimenting with JavaScript.

Michael Chen

Coding Bootcamp Instructor

The collaboration features on RunJavascript have made remote pair programming sessions with my team so much more efficient.

Emily Rodriguez

Senior Software Engineer