> ## Documentation Index
> Fetch the complete documentation index at: https://llm-tools.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Vertex AI

You to use Gemini LLM and other models on Google Cloud Platform via [VertexAI](https://cloud.google.com/vertex-ai?hl=en).
Read more about all the supported [LLMs](https://cloud.google.com/vertex-ai/generative-ai/docs/learn/models).

To get started, you need to set the right access credentials to google cloud. You have two options here -

* Authenticate by using `gcloud` CLI:

```
gcloud auth application-default login
```

* Authentication using Service Account with JSON key and environment variable:

```bash theme={null}
GOOGLE_APPLICATION_CREDENTIALS="<Path to credentials.json>"
```

Once this is done, you can configure your embedJs app -

## Install VertexAi addon

```bash theme={null}
npm install @llm-tools/embedjs-vertexai
```

## Usage

```ts theme={null}
import { RAGApplicationBuilder } from '@llm-tools/embedjs';
import { Ollama } from '@llm-tools/embedjs-vertexai';

const app = await new RAGApplicationBuilder()
.setModel(new VertexAI({ modelName: 'gemini-1.5-pro-preview-0409'}))
```