Run your Node.js program to see output here.
Key Features of Node.js Playground
- Standard Node APIs Utilize filesystem (fs), path, crypto, and utility modules inside the runtime.
- Live Output Logs Capture standard output stream logs and error callstacks directly.
- Syntax Validation Spot syntax errors, bad variables, or structure mismatches instantly.
Node.js Playground Examples
Reading File Statistics
Retrieve stats for a temporary virtual directory.
Input
const fs = require('fs');
console.log(fs.readdirSync('.'));Output
['Main.js', 'output.txt']How to Use Node.js Playground
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1. Write Node.js Code
Type your script using Node.js core modules like fs, path, events, or streams.
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2. Run It
Click Run or press ⌘↵. Your code runs on a Node.js 18 runtime via the Judge0 engine.
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3. View Output
console.log() output and errors appear in the Output panel.
Common Use Cases for Node.js Playground
- Evaluating Node.js Scripts Run utilities, formatters, or file manipulation algorithms instantly.
- Testing Cryptographic Functions Create hashes, encrypt tokens, or test signatures with crypto libraries.
- Learning Node Standard APIs Practice asynchronous operations, event emitters, or streams.
The Technical Details
The Node.js Playground submits source code to Judge0, executing it within a secure container-isolated Node.js sandbox. Results are parsed and rendered asynchronously client-side.
Frequently Asked Questions
Which Node.js version is used?
Node.js 18 (LTS) on the Judge0 CE sandbox.
Can I require npm packages?
No. Only Node.js built-in core modules are available: no npm or node_modules.
Can I perform HTTP requests?
Outbound network calls are blocked by the Judge0 sandbox for security.
Is my code private?
Code is submitted to the public Judge0 CE API. Avoid pasting sensitive data.