EmulatorJS / EmulatorJS-Netplay

Working netplay server for https://github.com/EmulatorJS/EmulatorJS

Running Your Own Netplay Server

This guide explains how to run the Netplay server designed specifically for Emulatorjs.org

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1. Prerequisites

Before you begin, ensure you have the following installed on your system:

• Node.js (v16 or later recommended)
  👉 Download Node.js

• npm (comes with Node.js) or yarn package manager

• Git
  👉 Download Git

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2. Clone the Repository

git clone https://github.com/EmulatorJS/EmulatorJS-Netplay
cd EmulatorJS-Netplay

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3. Install Dependencies

The server.js file depends on a few Node.js packages:

• express
• socket.io
• cors

Install them using npm:

npm install express socket.io cors

Or using yarn:

yarn add express socket.io cors

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4. Run the Server

To start the server:

node server.js

If you want to run it in development mode with auto-restart on file changes, install nodemon:

npm install -g nodemon
nodemon server.js

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5. Access the Server

By default, the server runs on:

http://localhost:3000

If you want to change the port, set the PORT environment variable.

Linux / macOS (bash / zsh):

PORT=4000 node server.js

Windows PowerShell:

$env:PORT=4000; node server.js

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6. (Optional) Run in Background with PM2

For production, use PM2 to keep the server running in the background.

Install PM2 globally:

npm install -g pm2

Start the server with a name:

pm2 start server.js --name my-server

View logs:

pm2 logs my-server

Restart the server:

pm2 restart my-server

Stop the server:

pm2 stop my-server

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7. (Optional) Keep Server Running After Reboot

To make PM2 auto-start after reboot:

pm2 startup

Follow the instructions it gives you, then save the current process list:

pm2 save

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✅ Done

You now have the server running locally!

• For production, use PM2 to keep it running and restart automatically.