Loading JavaScript...
Starting JavaScript sandbox...
workspace.javascript
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Output
Input (stdin)
Interactive sandbox awaiting execution...
JavaScriptNode.js 24Live Cloud Sandbox
Online JavaScript Compiler & Runner
High-performance JavaScript online compiler powered by Node.js. Test algorithms, modern ES6+ features, and manipulate inputs effortlessly. With code.thecoder.in, you can write, compile, and execute JavaScript code directly inside your web browser. No local SDKs, compilers, or configuration required.
Sub-Second Execution
Powered by high-performance serverless containers with pre-warmed compilers for near-instant execution feedback.
Standard Input (stdin)
Supply custom input datasets, simulate user prompts, and test multi-line edge cases with the interactive stdin tab.
Isolated & Secure
All code executes in an isolated private VPC container without network access, keeping your tests completely sandboxed.
JavaScript Quick Syntax Reference
Console Output & Variables
Use const and let for block-scoped variable declarations.
const greeting = "Hello";
let count = 42;
console.log(`${greeting}, count is ${count}`);Arrow Functions & Array Methods
Filter, map, and reduce data streams efficiently.
const nums = [1, 2, 3, 4]; const evens = nums.filter(x => x % 2 === 0);
Reading Stdin in Node.js
Read entire stdin synchronously using file descriptor 0.
const fs = require("fs");
const input = fs.readFileSync(0, "utf-8").trim();Explore Other Online Compilers
Frequently Asked Questions (JavaScript Compiler)
Does this run in the browser or on a server?
Code is securely executed in an isolated Node.js container on our high-speed serverless infrastructure, allowing full Node.js standard library access.
Can I use ES6 / modern JavaScript features?
Yes, modern features like optional chaining, async/await, template literals, and destructuring are fully supported.