---
title: "cheerpOSAddStringFile"
source: "https://cheerpj.com/docs/reference/cheerpOSAddStringFile"
---

# cheerpOSAddStringFile

Write a file into the virtual filesystem

Used to write files into the `/str/` filesystem. If the file already exists, it will be overwritten.

```ts
function cheerpOSAddStringFile(path: string, data: string | Uint8Array): void;
```

## Parameters

- **path (`string`)** - The path to the file to overwrite. Must begin with `/str/`.
- **data (`string` or `Uint8Array`)** - File contents, as text or binary data.

## Returns

`cheerpOSAddStringFile` does not return a value.

## Example

```js
cheerpOSAddStringFile("/str/fileName.txt", "Some text in a JS String");
```