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

# dev

> Start development environments for Mega projects

# mega dev

The `dev` command starts development environments for your Mega blockchain project.

## Usage

```bash theme={null}
mega dev [options]
```

## Options

| Option       | Description                                   |
| ------------ | --------------------------------------------- |
| `--foundry`  | Start only the Foundry/Anvil local blockchain |
| `--frontend` | Start only the Next.js frontend               |

## Description

This command detects and starts the appropriate development environments for your Mega project. By default, if both environments are detected, it starts both the Foundry/Anvil local blockchain and the Next.js frontend development server.

The command automatically:

* Detects Foundry and Next.js projects in the current directory or subdirectories
* Starts Anvil with appropriate configurations for local blockchain development
* Determines and uses the right package manager (npm, yarn, or pnpm) for the frontend
* Provides convenient output with contract addresses and private keys

## Examples

### Start both environments

```bash theme={null}
mega dev
```

### Start only the Foundry/Anvil local blockchain

```bash theme={null}
mega dev --foundry
```

### Start only the Next.js frontend

```bash theme={null}
mega dev --frontend
```

## Notes

* Press Ctrl+C to stop the development servers
* For cleaner logs, consider running the environments in separate terminals
* The Anvil blockchain runs on port 8545 by default
* The Next.js server typically runs on port 3000

## Related

* [init](/commands/init) - Create a new Mega project
* [compile](/commands/compile) - Compile contracts before development
* [deploy](/commands/deploy) - Deploy contracts to your development environment