Node.js 12.14.0 Sandbox • Automated Testcases • Free Online IDE
Online JavaScript (Node.js) Compiler
Write, compile, and execute JavaScript (Node.js) programs directly in your browser. Auto-check your code against custom standard inputs (stdin) and automated test cases. Free, instant, and no login required.
Free Online Code Compiler
Welcome to FlareBox Online Compiler. Write, compile, and execute code in JavaScript (Node.js) directly in your browser. No setup, installation, or login required.
Language:JavaScript (Node.js)
Version:Node.js 12.14.0
File Extension:.js
Execution Limit:8.0 Seconds / 256MB
What you can do:
AI Problem Generator
Generate custom coding interview problems with test cases on demand.
Automated Test Case Engine
Check your code against multiple inputs and get instant diff feedback.
Zero Login Required
Free instant compilation for 8+ popular programming languages.
solution.js
Press Ctrl+Enter to run
Loading FlareBox Enterprise Editor...
Click "Run Code" or press Ctrl+Enter to execute.
Your code will be evaluated against test cases and results will appear here.
JavaScript (Node.js) Coding Tips & Quick Reference
Helpful syntax patterns and I/O tips for competitive programming in JavaScript (Node.js).
Reading Stdin in Node.js
Read standard input synchronously in Node.js using fs.readFileSync(0).
const fs = require('fs');
const input = fs.readFileSync(0, 'utf-8').trim();JavaScript (Node.js) Compiler FAQs
Common questions about compiling and debugging JavaScript (Node.js) on FlareBox.
Does this compiler run in Node.js or the browser?
Code is executed in a secure, sandboxed Node.js server environment with standard process I/O support.