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# VercelDeployer

The `VercelDeployer` bundles your Mastra server and generates output conforming to Vercel's [Build Output API](https://vercel.com/docs/build-output-api/v3). Vercel deploys this output directly as serverless functions.

## Installation

To use `VercelDeployer`, install the `@mastra/deployer-vercel` package:

**npm**:

```bash
npm install @mastra/deployer-vercel@latest
```

**pnpm**:

```bash
pnpm add @mastra/deployer-vercel@latest
```

**Yarn**:

```bash
yarn add @mastra/deployer-vercel@latest
```

**Bun**:

```bash
bun add @mastra/deployer-vercel@latest
```

## Usage example

Import `VercelDeployer` and set it as the deployer in your Mastra configuration:

```typescript
import { Mastra } from '@mastra/core'
import { VercelDeployer } from '@mastra/deployer-vercel'

export const mastra = new Mastra({
  deployer: new VercelDeployer(),
})
```

## Constructor options

The deployer accepts the following options:

- `studio?: boolean` — Deploy [Studio](https://mastra.ai/docs/studio/overview) alongside your API as static assets served from Vercel's Edge CDN. Defaults to `false`.
- `maxDuration?: number` — Function execution timeout (in seconds)
- `memory?: number` — Function memory (in MB)
- `regions?: string[]` — Regions to deploy the function (e.g. `['sfo1','iad1']`)

The `maxDuration`, `memory`, and `regions` options are merged into `.vercel/output/functions/index.func/.vc-config.json` while preserving default fields (`handler`, `launcherType`, `runtime`, `shouldAddHelpers`).

### Example with overrides

```typescript
import { Mastra } from '@mastra/core'
import { VercelDeployer } from '@mastra/deployer-vercel'

export const mastra = new Mastra({
  deployer: new VercelDeployer({
    studio: true,
    maxDuration: 600,
    memory: 1536,
    regions: ['sfo1', 'iad1'],
  }),
})
```

## Build output

After running `mastra build`, the deployer generates a `.vercel/output` directory conforming to Vercel's [Build Output API (v3)](https://vercel.com/docs/build-output-api/v3). This directory contains routing configuration and serverless function bundles that Vercel deploys directly, bypassing framework detection.

The output contains:

- **config.json** — Routing configuration that directs requests to the appropriate handler
- **functions/** — Your Mastra server bundled as a serverless function
- **static/** — Studio SPA assets (only when `studio: true`)

Without studio:

```bash
.vercel/
└── output/
    ├── config.json
    └── functions/
        └── index.func/
            ├── .vc-config.json
            ├── index.mjs
            └── node_modules/
```

With `studio: true`:

```bash
.vercel/
└── output/
    ├── config.json
    ├── static/
    │   ├── index.html
    │   └── assets/
    │       ├── *.js
    │       └── *.css
    └── functions/
        └── index.func/
            ├── .vc-config.json
            ├── index.mjs
            └── node_modules/
```

When studio is enabled, the routing is configured so that `/api/*` requests are handled by the serverless function, static assets (JS, CSS) are served from Vercel's Edge CDN with no function invocations, and all other paths fall back to `index.html` for client-side routing.

This folder is generated during build and shouldn't be committed to version control.