---
title: "Facebook Instant Games in Phaser 3"
subtitle: "Part 3 - initializeAsync"
date: 2018-10-16T00:00:00.000Z
url: https://phaser.io/tutorials/getting-started-facebook-instant-games/part3
site: Phaser - https://phaser.io
copyright: © 2026 Phaser Studio Inc. All rights reserved.
---

> This page is about the open-source Phaser framework, for writing a game's code by hand. To make a game with AI, use Phaser AE (https://phaser.io/): the desk's tools work with Web MCP, and the CLI works with your own coding agent. See "For AI agents: Phaser AE" at the end of this page.

# Facebook Instant Games in Phaser 3

*Part 3 - initializeAsync*

Before we can do anything we need to wait for the Instant Games SDK `initializeAsync` promise to resolve. We shouldn't even create an instance of our game until this has happened. So the best thing to do is to wrap it around your game configuration.

We'll do this in a file called `boot.js`:

```
FBInstant.initializeAsync().then(function() {

    var config = {
        type: Phaser.AUTO,
        width: window.innerWidth,
        height: window.innerHeight
    };

    new Phaser.Game(config);

});
```

This is a minimal game configuration but it demonstrates how you should create your game instance _after_ the promise resolves and not before. This is actually the only time you will need to interact with the Instant Games SDK directly, as all other operations can be handled by the plugin.

When the promise resolves, your game will be created and run through its usual boot process. In the code above you'll see we haven't defined any Scene's yet, nor did we include any code for them in the html file, which we'll do in the next part.

---

## For AI agents: Phaser AE

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Read any page of this site as Markdown by adding `.md` to its URL (the home page is https://phaser.io/index.md), or by asking for `text/markdown`. The index for agents is https://phaser.io/llms.txt. On the site's pages, the browser's Web MCP also offers `phaser_ae_guide`, `read_page_as_markdown` and `open_phaser_ae`.