# NETWORK::_UGC_IS_BOOK_MARKED

- **Hash:** `0xE42D1042F09865FE`
- **Namespace:** NETWORK
- **Runtime name (Lua/JS):** `UgcIsBookMarked`
- **Side:** client (game native)
- **Name status:** community guess (may change)
- **Documentation:** named only
- **Since game build:** 1355
- **URL:** https://natives.borderlinerp.com/natives/NETWORK/_UGC_IS_BOOK_MARKED

## Signature

```c
BOOL _UGC_IS_BOOK_MARKED(const char* contentId);
```

## Parameters

- `contentId` (`const char*`)

## Returns

`BOOL`

## Usage

### Lua

```lua
local retval = UgcIsBookMarked(contentId)

-- always available, by hash
local retval = Citizen.InvokeNative(0xE42D1042F09865FE, contentId, Citizen.ReturnResultAnyway())
```

### JavaScript

```js
const retval = UgcIsBookMarked(contentId);

// by hash
const retval = Citizen.invokeNative('0xE42D1042F09865FE', contentId, Citizen.returnResultAnyway());
```

### C#

```csharp
bool retval = Function.Call<bool>((Hash)0xE42D1042F09865FE, contentId);
```

- The name is a community guess and may change. If the named call is missing in your client build, use `InvokeNative` with the hash — it always works.

*Sources: alloc8or RDR3 NativeDB.*