---
title: initialized
slug: performance-edge/api/initialized
docTags: 
createdAt: 2026-06-23T07:26:53.367Z
---

Fires once the JavaScript API has been initialized.

## Description

By this point, the Optimizely Performance Edge snippet will have processed all `window.optimizelyEdge.push` API calls that were made before the snippet began to execute or during Project JavaScript.

`window.optimizelyEdge.get` will now be defined in addition to `window.optimizelyEdge.push`, although visitor-specific state data (such as that returned by `get('visitor')` and `get('state').getCampaignStates())` may not have been determined yet.

The snippet only initializes once per browser page load.

```javascript
var initialized = function(initialized);
```

```javascript
function onInitialized(event) {
  console.log("Project " + window.optimizelyEdge.get("data").projectId + " is initialized");
}

window.optimizelyEdge = window.optimizelyEdge || [];
window.optimizelyEdge.push({
  type: "addListener",
  filter: {
    type: "lifecycle",
    name: "initialized"
  },
  handler: onInitialized
});
```

## Parameters

This table provides general information about required and optional parameters.

| Parameter                       | Type   | Description                                                           |
| ------------------------------- | ------ | --------------------------------------------------------------------- |
| **initialized** *required*      | object | This is the object passed to the handler function.                    |
| **initialized.type** *required* | string | The category of an event. The value will be lifecycle for this event. |
| **initialized.name** *optional* | string | The name of the event type. This is set to initialized.               |