# Installation

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***

**License:** `Dual-license`

The EventCatalog Federation plugin is designed for your [main catalog](/docs/plugins/eventcatalog-federation/configuration.md).

This plugin will allow you to merge multiple EventCatalog instances into a single catalog.

## Prerequisites[​](#prerequisites "Direct link to Prerequisites")

* [Installed EventCatalog](/docs/development/getting-started/installation.md)

## Installation[​](#installation "Direct link to Installation")

Run the command below to install the EventCatalog Federation plugin.

```
npm i @eventcatalog/generator-federation
```

## Configuration[​](#configuration "Direct link to Configuration")

Configure the plugin in your `eventcatalog.config.js` file.

Add the plugin to the `generators`.

eventcatalog.config.js

```
// ...
generators: [
    [
      '@eventcatalog/generator-federation',
      {
        // Pulling information from a GitHub repository, (generator supports any Git source e.g GitLab, Bitbucket, etc)
        source: 'git@github.com:event-catalog/generators.git',

        // specifying the branch to pull from (default is main)
        branch: 'main',

        // optional (specify which files you want to copy from the repository)
        copy: [
          {
            // importing content from the customer-experience-team catalog
            content: 'examples/generator-federation/basic/customer-experience-team/services',
            // specify the target path in your main catalog, here we are importing the services from the customer-experience-team catalog
            destination: path.resolve(__dirname, 'services')
          },
          {
            // importing content from the customer-experience-team catalog
            content: 'examples/generator-federation/basic/customer-experience-team/teams',
            // specify the target path in your main catalog, here we are importing the services from the customer-experience-team catalog
            destination: path.resolve(__dirname, 'teams')
          },
          {
            // importing content from the customer-experience-team catalog
            content: 'examples/generator-federation/basic/customer-experience-team/users',
            // specify the target path in your main catalog, here we are importing the services from the customer-experience-team catalog
            destination: path.resolve(__dirname, 'users')
          }
        ],

        // optional, if you want to merge and override any conflicts then set to true (default is false)
        override: true,

        // optional, if you want the plugin to error 
        // if there are duplicate resources in your 
        // main catalog then set to true (default is false)
        enforceUniqueResources: true
      },
    ],
    // Payment Team
    // When no `copy` values are provided, the plugin will copy eventcatalog files for you.
    [
      '@eventcatalog/generator-federation',
      {
        // Pulling information from a GitHub repository
        source: 'git@github.com:event-catalog/generators.git',

        // specifying the directory of the eventcatalog in your project (default it the root directory)
        // This example clones the generators repository, and looks for the eventcatalog in the my-project-eventcatalog directory
        sourceRootDir: 'my-project-eventcatalog'

        // specifying the branch to pull from (default is main)
        branch: 'main',

        // optional, if you want to merge and override any conflicts then set to true (default is false)
        override: true,

        // optional, if you want the plugin to error 
        // if there are duplicate resources in your 
        // main catalog then set to true (default is false)
        enforceUniqueResources: true
      },
    ],
  ],
```

### Configure license key[​](#configure-license-key "Direct link to Configure license key")

The EventCatalog Federation plugin requires a license key to work with EventCatalog.

You can get a trial license key from [EventCatalog Cloud](https://eventcatalog.cloud).

You have a few options for setting the license key:

1. [Setting license key in `.env` file (recommended)](#setting-license-key-in-env-file-recommended)
2. [Setting license key in eventcatalog.config.js](#setting-license-key-in-eventcatalogconfigjs)

#### 1. Setting license key in `.env` file (recommended)[​](#1-setting-license-key-in-env-file-recommended "Direct link to 1-setting-license-key-in-env-file-recommended")

**Added in** `eventcatalog@2.35.4`

Create a `.env` file in the root of your project and add the following:

.env

```
EVENTCATALOG_LICENSE_KEY_FEDERATION=your-license-key
```

Using an older version of EventCatalog?

If you are using an older version of EventCatalog that does not support the `.env` file, you can just export the license key as an environment variable.

Setting license key in environment variables

```
export EVENTCATALOG_LICENSE_KEY_FEDERATION=your-license-key
```

#### 2. Setting license key in eventcatalog.config.js[​](#2-setting-license-key-in-eventcatalogconfigjs "Direct link to 2. Setting license key in eventcatalog.config.js")

If you prefer, you can set the license key in the `eventcatalog.config.js` file using the `licenseKey` property in the EventCatalog Federation plugin.

eventcatalog.config.js

```
export default {
  generators: [
    [
      '@eventcatalog/generator-federation',
      {
        licenseKey: '[INSERT_YOUR_LICENSE_KEY]', // or process.env.EVENTCATALOG_LICENSE_KEY_FEDERATION
      },
    ],
  ],
};
```

#### White listing EventCatalog domains[​](#white-listing-eventcatalog-domains "Direct link to White listing EventCatalog domains")

If you are behind a firewall you will need to white list the domain `https://api.eventcatalog.cloud` in your firewall. This is because the plugin needs to verify your license key.

## Run the generator[​](#run-the-generator "Direct link to Run the generator")

Once you have configured the plugin and license key you can run the generator.

```
npm run generate
```

## View your catalog[​](#view-your-catalog "Direct link to View your catalog")

Run your catalog locally to see the changes.

```
npm run dev
```

## Any questions or need help?[​](#any-questions-or-need-help "Direct link to Any questions or need help?")

If you get stuck, find an issue or need help, please raise an issue on [GitHub](https://github.com/event-catalog/eventcatalog/issues) or join our [Discord community](https://eventcatalog.dev/discord).