Web games run on a small set of JS concepts: a requestAnimationFrame game loop, canvas or WebGL rendering, event-driven input, asynchronous asset loading, object/state management, and browser storage or networking for saving progress or multiplayer.
At a glance
| Fact | Value | Source |
|---|---|---|
| Rendering happens through Canvas API | 2D drawing surface | developer.mozilla.org |
| Persistent saves use Web Storage API | localStorage/sessionStorage | developer.mozilla.org |
| Real-time multiplayer uses WebSockets API | bidirectional connection | developer.mozilla.org |
A handful of JavaScript concepts cover most of what a browser game needs, whether you write raw JS or generate it from an engine:
- Game loop – a function driven by requestAnimationFrame that updates state and redraws each frame, instead of setTimeout-based polling.
- Rendering – drawing through the Canvas API for 2D, or WebGL for 3D and shader-based effects.
- Event-driven input – keyboard, mouse, pointer and touch listeners, since games can’t block on input like a desktop loop might.
- Asynchronous loading – promises and async/await for fetching images, audio and JSON level data before the game starts.
- State and object management – classes or plain objects to track entities, scenes and game state cleanly as complexity grows.
- Storage and networking – the Web Storage API for saves and settings, WebSockets for real-time multiplayer.
When you are ready to distribute, publishing through Playgama connects your build to multiple destinations using the open-source Playgama Bridge SDK, which adapts one HTML5 game to 25+ platforms.
If you build in an engine rather than raw JS, these concepts still apply underneath: Unity WebGL and Godot web exports both expose ways to call browser JavaScript directly (Unity via a .jslib plugin, Godot 4 via the JavaScriptBridge singleton) when you need storage, ads or platform APIs the engine doesn’t cover natively.
Where to publish once the game runs in a browser
Common destinations include Poki, CrazyGames, GameDistribution, itch.io, and playgama.com, where you upload via the Developer Console, get test feedback within 24 hours, and the game is published on the portal and distributed to partner sites.
Sources
- MDN: Canvas API
- Unity manual: interacting with browser scripting
- Godot docs: exporting for the Web
- Playgama for developers
Related questions
Do I need to know JavaScript if I use an engine like Unity or Godot?
Not always, but calling browser APIs (storage, ads, platform SDKs) from Unity WebGL or Godot web exports still requires writing JavaScript interop code.
What’s the difference between Canvas and WebGL for a browser game?
Canvas 2D is simpler for sprites and UI; WebGL gives GPU-accelerated 3D and shader effects but has a steeper learning curve.
Which JS concept trips up beginners most in game code?
The asynchronous nature of asset loading and input events – forgetting that images, audio and fetch calls resolve later, not immediately.
Last updated: 24 September 2026