What do I need to make a multiplayer browser game?

Web game programming with a framework such as Phaser or Three.js or an engine with web export, real-time networking with WebSockets or WebRTC, an authoritative game server, a database for accounts, and hosting that can scale.

Should I use WebSockets or WebRTC for a web game?

WebSockets are simpler and work for most browser multiplayer games, especially turn-based ones. WebRTC data channels add complexity but allow lower-latency, peer-to-peer or unreliable messages for fast action.

What is an authoritative server?

A server that decides the true state of the game. Players send inputs, the server computes the result and broadcasts it, which prevents most cheating because clients cannot simply claim outcomes.

Colyseus is an open-source Node.js framework for multiplayer games that provides rooms, matchmaking and automatic state synchronisation between the server and browser clients.

Is a turn-based multiplayer game easier to build?

Yes. The server only validates moves and broadcasts results, so there is no need for prediction or lag compensation. It is a good first multiplayer project.

Skills You Need to Build a Multiplayer Browser Game

The short answer

To build a multiplayer browser game you need web game programming (JavaScript or TypeScript with a framework such as Phaser or Three.js, or an engine with web export such as Unity), real-time networking (WebSockets or WebRTC), a game server that is the authority on the game state (often Node.js with Colyseus or Socket.IO), and skills in hosting, scaling and security. Turn-based games are much easier than fast real-time action, which also needs prediction and lag compensation.

The client: making the game run in a browser

Option	Best for	Language
Phaser	2D games	JavaScript or TypeScript
PixiJS	Fast 2D rendering	JavaScript or TypeScript
Three.js, Babylon.js, PlayCanvas	3D in the browser	JavaScript or TypeScript
Unity Web	Teams already using Unity; richer 3D	C#
Godot web export	Open-source engine projects	GDScript or C#

Web games live or die on load time and file size, so asset compression and small initial downloads matter. Our article on web games in 2026 covers build size rules and portals.

Networking: how browsers talk in real time

Technology	What it gives you	Typical use
WebSockets	A persistent, reliable two-way connection to a server	Most browser multiplayer games, chat, turn-based play
WebRTC data channels	Peer-to-peer or server connections with optional unreliable, low-latency messages	Fast action, voice, peer-to-peer games
WebTransport	A newer low-latency API over HTTP/3	Emerging option; check browser support

Most teams start with WebSockets because they are simple and supported everywhere. WebRTC adds complexity, such as connection negotiation, in exchange for lower latency.

The server: one source of truth

In an authoritative server model, players send their inputs and the server decides what actually happens, then sends the result to everyone. This prevents most cheating, because a modified client cannot simply claim it won. Frameworks help:

Colyseus: an open-source Node.js framework built for multiplayer games, with rooms, matchmaking and automatic state synchronisation.
Socket.IO: a widely used real-time messaging library on top of WebSockets; you build the game logic yourself.
Other stacks: Go, C#, Rust or Elixir servers are common when performance or existing skills favour them.

The hard parts

Latency

Players are at different distances from the server. Real-time games use client-side prediction (move your own character immediately), interpolation (smooth other players' movement between updates) and lag compensation (judge hits from the shooter's point of view). These are the most specialised skills in the list.

Rooms and matchmaking

Grouping players into matches, handling people who leave and rejoin, and filling empty slots all need careful logic.

Accounts and persistence

Logins, saved progress, friends and leaderboards need a database and secure authentication. Our comparison of Firebase, PlayFab and custom backends covers the options.

Scaling and hosting

Servers must run close to players and handle peaks. Containers and cloud hosting with auto-scaling are common; costs grow with concurrent players, so measure early.

Security

Never trust the client: validate every input on the server, rate-limit messages and protect against bots. See anti-cheat for small multiplayer games.

Turn-based versus real-time

A turn-based card or board game only needs the server to validate moves and broadcast results, so a small team can build it quickly. Real-time shooters and racing games need prediction, high update rates and careful server placement. If you are new to multiplayer, start turn-based; our guide to turn-based multiplayer games explains the architecture.

Testing

Test with simulated latency and packet loss from the first prototype, use bots to fill matches, and load-test the server before launch. Bugs that only appear with lag are the most common surprise in multiplayer projects.

A typical small-team setup

Role	Responsibility
Client developer	Rendering, input, UI and sending inputs to the server
Server developer	Game rules on the server, rooms, matchmaking and persistence
Designer	Rules and balance that work with network delay
DevOps (often shared)	Hosting, deployment, monitoring and scaling

On small projects one or two developers cover the client and server roles, but someone should own server operations from the first public test.

Skill checklist

JavaScript or TypeScript, or C# for Unity Web
A web game framework or engine
WebSockets, and WebRTC if you need low latency
Server programming, usually Node.js
Prediction, interpolation and lag compensation for real-time games
Databases, authentication and basic security
Cloud hosting, monitoring and scaling

Costs to expect

The client is often the cheaper half. Server development, testing under real network conditions and ongoing hosting are where multiplayer budgets grow, and hosting cost rises with concurrent players. Plan a closed test with real players early to measure bandwidth and server load before committing to infrastructure. Our article on multiplayer mobile game costs breaks down where the money goes.

Building one with us

We build multiplayer games for web, mobile and PC, from turn-based to online shooters. Send us your idea for a fixed quote.

Sources: MDN: WebSockets API · MDN: WebRTC API · MDN: WebTransport API · Colyseus documentation · Socket.IO documentation · Phaser. Checked October 20, 2026.

Skills you need to build a multiplayer browser game