bitburner-src/markdown/bitburner.ns.fileexists.md

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## NS.fileExists() method

Check if a file exists.

**Signature:**

```typescript
fileExists(filename: string, host?: string): boolean;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  filename | string | Filename of file to check. |
|  host | string | _(Optional)_ Host of target server. Optional, defaults to the server the script is running on. |

**Returns:**

boolean

True if specified file exists, and false otherwise.

## Remarks

RAM cost: 0.1 GB

Returns a boolean indicating whether the specified file exists on the target server. The filename for programs is case insensitive, other file types are case sensitive. For example, fileExists(“brutessh.exe”) will work fine, even though the actual program is named 'BruteSSH.exe'.

\*

## Example


```js
// The function call will return true if the script named foo.js exists on the foodnstuff server, and false otherwise.
ns.fileExists("foo.js", "foodnstuff");

// The function call will return true if the current server contains the FTPCrack.exe program, and false otherwise.
ns.fileExists("ftpcrack.exe");
```