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outline: deep
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# Memory Adapter
[](https://www.npmjs.com/package/@feathersjs/memory)
[](https://github.com/feathersjs/feathers/blob/dove/packages/memory/CHANGELOG.md)
`@feathersjs/memory` is a service adatper for in-memory data storage that works on all platforms. It is normally not used to store data on a production server but can be useful for data that isn't persistent and to e.g. cache data in browser or React Native applications.
```bash
$ npm install --save @feathersjs/memory
```
The memory adapter implements the [common database adapter API](./common) and [querying syntax](./querying).
## API
### Usage
```ts
import { MemoryService } from '@feathersjs/memory'
type Message = {
id: number
text: string
}
type MessageData = Pick
class MyMessageService extends MemoryService {}
app.use('messages', new MyMessageService({}))
```
### Options
The following options are available:
- `id` (_optional_, default: `'id'`) - The name of the id field property.
- `startId` (_optional_, default: `0`) - An id number to start with that will be incremented for every new record (unless it is already set).
- `store` (_optional_) - An object with id to item assignments to pre-initialize the data store
- `events` (_optional_) - A list of [custom service events](https://docs.feathersjs.com/api/events.html#custom-events) sent by this service
- `paginate` (_optional_) - A [pagination object](https://docs.feathersjs.com/api/databases/common.html#pagination) containing a `default` and `max` page size
- `allow` (_optional_) - A list of additional query parameters to allow
- `multi` (_optional_) - Allow `create` with arrays and `update` and `remove` with `id` `null` to change multiple items. Can be `true` for all methods or an array of allowed methods (e.g. `[ 'remove', 'create' ]`)