react-native/docs/appregistry.md

---
id: appregistry
title: AppRegistry
layout: docs
category: APIs
permalink: docs/appregistry.html
next: appstate
previous: animated
---

<div class="banner-crna-ejected">
  <h3>Project with Native Code Required</h3>
  <p>
    This API only works in projects made with <code>react-native init</code>
    or in those made with Create React Native App which have since ejected. For
    more information about ejecting, please see
    the <a href="https://github.com/react-community/create-react-native-app/blob/master/EJECTING.md" target="_blank">guide</a> on
    the Create React Native App repository.
  </p>
</div>

`AppRegistry` is the JS entry point to running all React Native apps.  App
root components should register themselves with
`AppRegistry.registerComponent`, then the native system can load the bundle
for the app and then actually run the app when it's ready by invoking
`AppRegistry.runApplication`.

To "stop" an application when a view should be destroyed, call
`AppRegistry.unmountApplicationComponentAtRootTag` with the tag that was
passed into `runApplication`. These should always be used as a pair.

`AppRegistry` should be `require`d early in the `require` sequence to make
sure the JS execution environment is setup before other modules are
`require`d.


### Methods

- [`setWrapperComponentProvider`](docs/appregistry.html#setwrappercomponentprovider)
- [`registerConfig`](docs/appregistry.html#registerconfig)
- [`registerComponent`](docs/appregistry.html#registercomponent)
- [`registerRunnable`](docs/appregistry.html#registerrunnable)
- [`registerSection`](docs/appregistry.html#registersection)
- [`getAppKeys`](docs/appregistry.html#getappkeys)
- [`getSectionKeys`](docs/appregistry.html#getsectionkeys)
- [`getSections`](docs/appregistry.html#getsections)
- [`getRunnable`](docs/appregistry.html#getrunnable)
- [`getRegistry`](docs/appregistry.html#getregistry)
- [`setComponentProviderInstrumentationHook`](docs/appregistry.html#setcomponentproviderinstrumentationhook)
- [`runApplication`](docs/appregistry.html#runapplication)
- [`unmountApplicationComponentAtRootTag`](docs/appregistry.html#unmountapplicationcomponentatroottag)
- [`registerHeadlessTask`](docs/appregistry.html#registerheadlesstask)
- [`startHeadlessTask`](docs/appregistry.html#startheadlesstask)




---

# Reference

## Methods

### `setWrapperComponentProvider()`

```javascript
static setWrapperComponentProvider(provider)
```



---

### `registerConfig()`

```javascript
static registerConfig(config)
```



---

### `registerComponent()`

```javascript
static registerComponent(appKey, componentProvider, section?)
```



---

### `registerRunnable()`

```javascript
static registerRunnable(appKey, run)
```



---

### `registerSection()`

```javascript
static registerSection(appKey, component)
```



---

### `getAppKeys()`

```javascript
static getAppKeys()
```



---

### `getSectionKeys()`

```javascript
static getSectionKeys()
```



---

### `getSections()`

```javascript
static getSections()
```



---

### `getRunnable()`

```javascript
static getRunnable(appKey)
```



---

### `getRegistry()`

```javascript
static getRegistry()
```



---

### `setComponentProviderInstrumentationHook()`

```javascript
static setComponentProviderInstrumentationHook(hook)
```



---

### `runApplication()`

```javascript
static runApplication(appKey, appParameters)
```



---

### `unmountApplicationComponentAtRootTag()`

```javascript
static unmountApplicationComponentAtRootTag(rootTag)
```



---

### `registerHeadlessTask()`

```javascript
static registerHeadlessTask(taskKey, task)
```


Register a headless task. A headless task is a bit of code that runs without a UI.

**Parameters:**

| Name | Type | Required | Description |
| - | - | - | - |
| taskKey | string | No | The key associated with this task. |
| task | function | No | A promise returning function that takes some data passed from the native side as the only argument; when the promise is resolved or rejected the native side is notified of this event and it may decide to destroy the JS context. |


---

### `startHeadlessTask()`

```javascript
static startHeadlessTask(taskId, taskKey, data)
```

Only called from native code. Starts a headless task.

**Parameters:**

| Name | Type | Required | Description |
| - | - | - | - |
| taskId | number | No | The native id for this task instance to keep track of its execution |
| taskKey | string | No | The key for the task to start |
| data | any | No | The data to pass to the task |