NodeJS 22.19.0

Online NodeJS Editor & Code Runner

Name: myCompiler NodeJS
Author: myCompiler

myCompiler is a free online NodeJS editor and code runner that lets you write, run, and share NodeJS code directly in your browser. It works as your NodeJS playground, sandbox, fiddle, cloud compiler, and online REPL. No downloads, no installation needed. Just open the editor and start coding with syntax highlighting, autocomplete, and instant output.

Start coding in NodeJS How it works

27+ languages Used by 1M+ developers Free forever

main.js

const crypto = require("crypto");
const path = require("path");

const users = [
  { name: "Alice", role: "admin" },
  { name: "Bob", role: "user" },
  { name: "Charlie", role: "user" },
];

const admins = users
  .filter(u => u.role === "admin");
admins.forEach(u => {
  const id = crypto.randomUUID().slice(0, 8);
  console.log(`${u.name}: ${id}`);
});

Output

Alice: a3f1b2c9

How to run NodeJS code online

Three steps to go from idea to running NodeJS code in this online playground. No account required.

Write your code

Open the NodeJS editor and start writing. The smart editor gives you syntax highlighting, autocomplete, and error detection as you type.

Click Run

Hit the Run button or press +Enter to run your NodeJS code on secure, sandboxed cloud servers.

See results

Output appears instantly in the integrated terminal. Errors and exceptions show up with clear, helpful messages.

Everything you need to code in NodeJS

A complete online NodeJS IDE and coding playground in your browser. Write, run, and share code without any setup.

Zero setup required

Start coding in seconds with this browser-based NodeJS interpreter. No downloads, no installations, no environment configuration. Open your browser, go to myCompiler, and start writing NodeJS code immediately.

Works on any device with a web browser. Desktop, laptop, tablet, phone, Chromebook. There is nothing to install and nothing to configure.

Feature-rich code editor

Write NodeJS with a professional-grade code editor built into your browser. Syntax highlighting colors your code for readability, making keywords, strings, and functions easy to distinguish at a glance.

Intelligent autocomplete suggests methods and properties as you type, and real-time error detection catches mistakes before you run your code.

Multi-file projects

Create and manage multiple files in a single project. Use the file sidebar to organize your code into modules, then import them across files just like in a desktop IDE.

Build modular applications with proper project structure. Each file is editable, and you can switch between them instantly.

Run code instantly

Click the Run button or press +Enter to execute your NodeJS code instantly. This online code runner displays output immediately in the integrated terminal panel. Your code runs on secure, sandboxed cloud servers and results appear in seconds.

Error messages and tracebacks are displayed clearly, making it easy to find and fix issues. The terminal supports ANSI colors for rich output formatting.

Ready to try it? Write and run your first NodeJS program in seconds.

Open NodeJS editor

NodeJS on myCompiler

myCompiler runs NodeJS 22.19.0, always up to date with the latest stable release. You get a full browser-based IDE with syntax highlighting, intelligent code completion, multi-file project support, a built-in terminal for real-time output, and standard input (stdin) for interactive programs. Write, compile, run, and debug NodeJS code on any device. Desktop, laptop, tablet, phone, Chromebook. Zero downloads, zero configuration, and no sign-up required. Save your programs with a unique URL and share them with anyone. You can also embed a working NodeJS editor on your own website.

Use this online NodeJS playground as a quick code executor for testing snippets, a coding sandbox for learning, or a cloud compiler for coding interview preparation. The editor includes dark mode for comfortable coding, keyboard shortcuts for faster workflows, and clear error messages with line numbers so you can debug quickly. Students use it for homework and practice. Teachers use it to share working examples. Developers use it to prototype ideas. myCompiler is beginner-friendly, fast, and completely free. It works in any modern web browser.

Start coding in NodeJS

NodeJS code examples

Common NodeJS patterns you can try in the online compiler. Each example is ready to run.

Hello World in NodeJS

main.js

console.log("Hello, World!");

Variables and Data Types in NodeJS

main.js

const name = "Alice";
let age = 30;
const isStudent = true;
console.log(`${name} is ${age} years old`);

If-Else Conditionals in NodeJS

main.js

const x = 10;
if (x > 0) {
  console.log("Positive");
} else if (x === 0) {
  console.log("Zero");
} else {
  console.log("Negative");
}

For and While Loops in NodeJS

main.js

for (let i = 0; i < 5; i++) {
  console.log(`Count: ${i}`);
}

const fruits = ["apple", "banana", "cherry"];
for (const fruit of fruits) {
  console.log(fruit);
}

Functions in NodeJS

main.js

function greet(name, greeting = "Hello") {
  return `${greeting}, ${name}!`;
}

console.log(greet("Alice"));
console.log(greet("Bob", "Hi"));

Arrays and Collections in NodeJS

main.js

const fruits = ["apple", "banana", "cherry"];
fruits.push("date");
console.log(fruits[1]);

const person = { name: "Alice", age: 30 };
console.log(person.name);

Classes and Objects in NodeJS

main.js

class Dog {
  constructor(name, breed) {
    this.name = name;
    this.breed = breed;
  }

  bark() {
    return `${this.name} says Woof!`;
  }
}

const dog = new Dog("Rex", "Labrador");
console.log(dog.bark());

Error Handling in NodeJS

main.js

try {
  const result = JSON.parse("invalid json");
} catch (e) {
  console.log(`Error: ${e.message}`);
} finally {
  console.log("Done");
}

File I/O in NodeJS

main.js

const fs = require("fs");

// Write to file
fs.writeFileSync("output.txt", "Hello, File!");

// Read from file
const content = fs.readFileSync("output.txt", "utf8");
console.log(content);

Async/Await in JavaScript

main.js

function delay(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function main() {
  console.log("Start");
  await delay(100);
  console.log("Done after 100ms");
}

main();

Try these examples in the editor

How to take input in NodeJS online

myCompiler supports standard input (stdin) for NodeJS programs. Use NodeJS's standard input functions to read user input. Enter your input data in the stdin panel before running your program.

This works for both single-line and multi-line input. You can read strings and convert to numbers using the language's built-in I/O functions.

Try it yourself

main.js stdin supported

const readline = require("readline");
const rl = readline.createInterface({
  input: process.stdin
});

const lines = [];
rl.on("line", (line) => lines.push(line));
rl.on("close", () => {
  console.log(`Hello ${lines[0]}!`);
  console.log(`You'll be ${+lines[1] + 1} next year.`);
});

stdin

Alice
25

Output

Hello Alice!
You'll be 26 next year.

No setup, no sign-up. Start writing NodeJS code right now.

Start coding now

Getting started with NodeJS online

You can start writing and running NodeJS code right now without installing anything. Type your code, and click Run. This free NodeJS code runner executes your program instantly and displays the output in the terminal panel below the editor. Open the NodeJS online editor, type your code, and click Run.

If you're new to NodeJS, use this online NodeJS playground to start with the basics like variables, data types, conditionals, and loops. The code examples above cover all the fundamentals you need to get started. Each example can be copied into the sandbox and run immediately. No setup, no configuration.

As you progress, try creating multi-file projects, using libraries, and sharing your programs with others via URL. Sign up for a free account to save your work and build a personal library of programs. myCompiler works as a full online NodeJS IDE right in your browser.

Who uses myCompiler

Whether you're learning to code, preparing for interviews, or prototyping ideas, myCompiler is built for you.

Students & Learners

Practice exercises, complete homework assignments, and experiment with code without installing anything on school or personal computers.

Teachers & Educators

Share code examples with students via unique URLs. Embed the compiler in course materials so students can run examples directly in the browser.

Interview Candidates

Practice coding interview problems, test algorithms, and verify solutions quickly during preparation for technical interviews.

Professional Developers

Quickly prototype ideas, test code snippets, or try out a library without setting up a local environment. Great for quick experiments.

Content Creators & Bloggers

Embed interactive examples in blog posts, tutorials, and documentation so readers can run code without leaving the page.

Teams & Collaborators

Share code snippets with colleagues via URLs. Others can view, run, and fork your code to build on your work.

myCompiler vs. local IDE

Why use an online NodeJS compiler instead of installing one locally?

Feature	myCompiler	Local IDE
Setup time	Instant	Minutes to hours
Installation	None required	NodeJS + IDE required
Device support	Any browser	Desktop only
Sharing code	One-click URL	Manual (file, git, etc.)
Languages	27+ in one place	One at a time
Cost	Free forever	Free to $$$
Works on Chromebook	Yes	Limited

What is NodeJS?

Node.js is an open-source, cross-platform JavaScript runtime built on Chrome's V8 engine. Created by Ryan Dahl in 2009, Node.js brought JavaScript to the server side, enabling developers to use the same language for both frontend and backend development. It uses an event-driven, non-blocking I/O model that makes it exceptionally efficient for I/O-heavy workloads.

Node.js powers some of the world's busiest applications. LinkedIn, Netflix, Uber, and PayPal all use Node.js in their backend infrastructure. The npm (Node Package Manager) registry hosts over 2 million packages, making it the largest software ecosystem in the world.

What is NodeJS used for?

Node.js is used for REST APIs and web servers with Express and Fastify, real-time applications like chat apps and collaborative tools using Socket.io, microservices architectures, CLI tools, GraphQL APIs, and serverless functions on AWS Lambda and Vercel. Its non-blocking nature makes it ideal for applications that handle many concurrent connections.

NodeJS for beginners

If you already know JavaScript from the browser, Node.js is a natural next step for learning backend development. The same language, same syntax, same console.log, just running on a server instead of in a browser. Use myCompiler's online Node.js editor to practice built-in modules like fs, path, http, and events without installing anything locally.

NodeJS vs other languages

Compared to Python for backend development, Node.js excels at high-concurrency scenarios due to its event loop, while Python is preferred for data science and ML workloads. Compared to Go, Node.js has a larger ecosystem but Go has better performance for CPU-bound tasks and simpler concurrency primitives. Compared to Deno, Node.js has a vastly larger package ecosystem but lacks Deno's native TypeScript support and security model.

Why use an online NodeJS compiler?

An online Node.js editor, also called a Node.js playground or sandbox, lets you run server-side JavaScript directly in your browser without installing Node.js locally. This is useful for testing Express route logic, experimenting with built-in modules, practicing async patterns, and sharing reproducible examples without environment configuration.

myCompiler's online Node.js IDE supports ES modules, CommonJS, async/await, and all built-in Node.js modules including fs, path, crypto, stream, and events. Save your programs, share via URL, or provide stdin input, all completely free.

Why is NodeJS so popular?

Node.js transformed JavaScript from a browser-only language into a full-stack platform. Its single-threaded event loop handles thousands of concurrent connections without the overhead of multi-threading. The npm ecosystem, active community, and support from major cloud providers (AWS, Google Cloud, Azure) have made it one of the most deployed server-side runtimes in the world. Its "JavaScript everywhere" promise remains one of the most compelling advantages in modern web development.

NodeJS career opportunities

Node.js skills are sought for backend developer, full-stack developer, API engineer, DevOps engineer, and serverless developer roles. Companies using Node.js in production include LinkedIn, Netflix, Walmart, and thousands of startups. Combined with a frontend framework like React, Node.js proficiency makes you a highly employable full-stack JavaScript developer.

Try NodeJS online Free · No sign-up needed

Keyboard shortcuts

Code faster with these keyboard shortcuts in the myCompiler editor.

Run code

+ Enter

Save program

+ S

Toggle comment

+ /

Indent line

Tab

Unindent line

Shift + Tab

Undo

+ Z

Select next occurrence

+ D

Find & replace

+ H

Embed the NodeJS compiler on your website

Add an interactive NodeJS compiler to your website, blog, or learning platform. Readers can write and run NodeJS code directly on your page without leaving it.

Perfect for technical tutorials, coding courses, documentation, and educational content. Save a program on myCompiler and use the embed link to add it to any webpage.

Embedded NodeJS editor and code runner

HTML

<iframe
src="https://www.mycompiler.io
    /embed/nodejs"
width="100%"
height="400"
frameborder="0">
</iframe>

Why developers choose myCompiler

A full-featured online IDE for NodeJS and 27+ other programming languages.

27+ Languages

Python, JavaScript, Java, C++, Rust, Go, TypeScript, C#, and many more. All compilers and interpreters in one place. Switch languages instantly.

Dark & Light Mode

Switch between light and dark themes with one click. Code comfortably in any lighting condition, day or night.

Mobile Friendly

Fully responsive editor optimized for phones, tablets, and Chromebooks. Code on any device with a web browser. No app download needed.

Save & Share Code

Save programs to your account, share via unique URLs, and let others view, fork, and run your code. Great for collaboration and code reviews.

Tags & Organization

Organize your saved programs with tags and find them quickly with search and filters. Build a personal library of code snippets and solutions.

No Account Required

Start writing and running code immediately. No sign-up, no email, no credit card. Create a free account later only if you want to save your work.

Explore more programming languages

myCompiler supports 27+ languages. Switch between them anytime. All free, all in one place.

Deno

Python

Ruby

View all 27+ languages

Frequently asked questions

Common questions about using the online NodeJS compiler, playground, and code runner.

Yes! myCompiler is completely free for all supported languages including NodeJS. There are no subscriptions, no premium tiers, and no hidden costs. Every feature is available at no charge.

myCompiler keeps its NodeJS environment up to date. You can see the exact version on the language details section of this page. We regularly update all language runtimes to their latest stable versions.

myCompiler runs a recent version of Node.js with support for modern JavaScript features including ES modules, async/await, and built-in modules like fs, path, and crypto. Check the language details section for the exact version. you can use all standard Node.js built-in modules like fs, path, http, and crypto in your code.

Simply open the NodeJS editor, write or paste your code, and click the Run button. Your code will be executed on our servers and the output will appear in the terminal panel within seconds.

Yes. Click Save to store your program. You will receive a unique URL that you can share with anyone. Recipients can view, fork, and run your code.

Yes. myCompiler supports multi-file projects. You can create, rename, and delete files in the sidebar. This lets you organize your NodeJS code just like in a local IDE.

Yes. All code runs in isolated containers on our servers. Each execution gets its own sandboxed environment that is destroyed after completion. Your code cannot affect other users or our infrastructure.

Yes. myCompiler has a responsive design optimized for phones and tablets. You can write and run NodeJS code on the go. The mobile interface uses tabs for switching between the editor, output, and file panels.

Yes. Click the Input tab in the bottom panel, type or paste your input data, then click Run. Your program will read from the input you provided.

Execution is fast. Code runs on our optimized cloud infrastructure and output typically appears within seconds. Execution time depends on the complexity of your program.

Yes. myCompiler provides an embed feature. You can copy an iframe snippet and paste it into your website, blog, or documentation. Visitors can edit and run code directly on your page.

myCompiler supports common editor shortcuts including Run (Ctrl/Cmd+Enter), Save (Ctrl/Cmd+S), Find (Ctrl/Cmd+F), and more. See the keyboard shortcuts section on this page for the full list.

No. myCompiler requires an internet connection because code is compiled and executed on our cloud servers. The editor itself loads in your browser, but running code requires connectivity.

myCompiler offers a fast, free, zero-setup environment with a modern code editor, multi-file support, dark mode, and instant sharing. It is ideal for learning, prototyping, interviews, and sharing code examples.

Yes. myCompiler is great for practicing algorithms and coding problems. You can write NodeJS code, provide custom input, and test your solutions instantly. Save your work and come back to it anytime.

Use print statements or console output to trace your program's behavior. myCompiler shows all standard output and error messages in the terminal panel. Error messages include line numbers to help you locate issues.

Ready to write NodeJS code?

Open the free NodeJS playground and start coding immediately. No downloads, no account required.

Start coding in NodeJS

Free · No sign-up required · NodeJS 22.19.0