cosmos-sdk/docs/lotion/building-an-app.md

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# Building an App
::: tip
Lotion requires __node v7.6.0__ or higher, and a mac or linux machine.
:::
## Installation
```
$ npm install lotion
```
## Simple App
`app.js`:
```js
let lotion = require('lotion')
let app = lotion({
initialState: {
count: 0
}
})
app.use(function (state, tx) {
if(state.count === tx.nonce) {
state.count++
}
})
app.listen(3000)
```
run `node app.js`, then:
```bash
$ curl http://localhost:3000/state
# { "count": 0 }
$ curl http://localhost:3000/txs -d '{ "nonce": 0 }'
# { "ok": true }
$ curl http://localhost:3000/state
# { "count": 1 }
```
## Learn More
You can learn more about Lotion JS by visiting Lotion on [Github](https://github.com/keppel/lotion).