Why Skip the Framework?
You don’t need a massive framework to build engaging browser games. Vanilla JavaScript gets you there faster, keeps your bundle size down, and honestly teaches you way more about how games actually work under the hood.
When you write your own game loop, manage state manually, and handle collision detection from scratch, you’re not just coding — you’re learning the fundamentals that every game engine depends on. That knowledge transfers everywhere.
The Game Loop: Your Foundation
Every game revolves around a loop that repeats roughly 60 times per second. You’re clearing the screen, updating game state, checking for collisions, and rendering everything. It’s the heartbeat of your game.
Here’s the core pattern: RequestAnimationFrame gives you that timing. Update your game objects — move players, animate sprites, apply gravity. Then render everything to the canvas. That’s it. Repeat. You’ll typically spend 15-20 milliseconds per frame doing this work, which is plenty of time for most browser games.
Pro tip: Separate your update logic from your render logic. This makes debugging way easier and lets you run game logic faster than rendering if you need to.
State Management Without Complexity
You’ll need to track what’s happening in your game. Where’s the player? How many points do they have? Which enemies are still alive? That’s your game state.
Don’t overthink this. A simple object works great. Keep player data in one place, enemies in an array, UI state in another object. When something changes, update the object. When you render, read from the object. You’ve got your entire game state in one place — easy to debug, easy to understand.
This approach scales better than you’d think. Even games with hundreds of entities stay manageable when you’re organized about it. Just be consistent about how you structure things.
Handling Collisions Efficiently
Collision detection is where things get interesting. You’re checking if objects overlap, and there’s no single “best” way — it depends on your game.
Axis-aligned bounding boxes (AABB) work great for most games. Two rectangles overlap? You’ve got a collision. The math is simple, the performance is solid, and you don’t need a physics engine. If you need something more precise, circle collisions are your next step — slightly more math, but still lightweight.
The key is not checking every object against every other object. That gets slow fast. Use spatial partitioning — divide your game world into a grid and only check collisions between objects in the same cell. Suddenly checking 500 entities becomes checking 4-5 at a time.
Educational Note: This article provides informational guidance on vanilla JavaScript game development practices. Performance characteristics, load times, and code structure recommendations are based on typical browser game development patterns. Your specific results will depend on your game’s complexity, target devices, and implementation details. For production games, always profile your code and test across different devices and browsers.
Keep It Simple, Keep It Fast
You don’t need abstractions and layers and plugins. Write your game loop, manage your state cleanly, and handle collisions without overthinking it. You’ll ship faster, your code will be easier to understand, and you’ll actually learn something about how games work.
Start small. Build a pong game or a space shooter. Get comfortable with the fundamentals. Then scale up. You’ve got this.
