> ## Documentation Index
> Fetch the complete documentation index at: https://developers.upmarket.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Development

> Install the Mintlify CLI to preview changes locally

<Tabs>
  <Tab title="npm">
    Using the [npm](https://www.npmjs.com) package manager

    ```bash theme={null}
    npm i -g mintlify
    ```
  </Tab>

  <Tab title="yarn">
    Using the [yarn](https://yarnpkg.com) package manager

    ```bash theme={null}
    yarn global add mintlify
    ```
  </Tab>
</Tabs>

## Previewing Changes Locally

Run the following command at the root of your documentation where `mint.json` is located. Mintlify will open at `localhost:3000`.

```bash Terminal theme={null}
mintlify dev
```

## Troubleshooting

Here's how to solve some common problems when working with the CLI.

<AccordionGroup>
  <Accordion title="Mintlify is not loading">
    Update to Node v18 and the latest version of Git.
  </Accordion>

  <Accordion title="Mintlify is not loading after updating Node and Git">
    Run `mintlify install` and try again.
  </Accordion>

  <Accordion title="Port 3000 is already taken">
    The Mintlify CLI will automatically move to the next port if you were already running something at `localhost:3000`. For example, if you were running two documentation sites, they would be at `localhost:3000` and `localhost:3001`.
  </Accordion>
</AccordionGroup>