---
title: IndexedDB API
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---

:::warning

IndexedDB is a very low-level API.  It is strongly recommended to use a wrapper
library or [WebSQL](/docs/demos/data/websql) in production applications.

:::

`localForage` is a IndexedDB wrapper that presents an async Storage interface.

Arrays of objects can be stored using `JSON.stringify` using row index as key:

```js
const aoo = XLSX.utils.sheet_to_json(ws);
for(var i = 0; i < aoo.length; ++i) await localForage.setItem(i, JSON.stringify(aoo[i]));
```

Recovering the array of objects is possible by using `JSON.parse`:

```js
const aoo = [];
for(var i = 0; i < localForage.length; ++i) aoo.push(JSON.parse(await localForage.getItem(i)));
const wb = XLSX.utils.json_to_sheet(aoo);
```