# Server Script

The server script, `script.js` defines what libraries are imported and is what will get us to our end goal

## Before You Start - **Dev Mode**

Before you start, make sure you have an exchange running in [dev mode](/developers/run-dev-mode.md) on your machine. It is important to have the exchange running in dev mode instead of a standard production CLI setup.

Dev mode exchange has live code updates and any changes in the code will get immediately applied which will make your development experience much better as a developer.

## Create the Script

Looking inside the `plugins/src/plugins/<YOUR_PLUGIN>` you will see that the [initialization](/plugins/develop-plugins/advanced/initialization.md) created a server folder for us. This is the folder where the `config.json` was made.

1. Create a new file in this server folder called `script.js`&#x20;
2. Code `script.js` to whatever goal you have in mind for the plugin (I recommended here looking below at the hello-exchange walkthrough to get an idea of how a script can look)&#x20;

`script.js` is the server-side code that runs during runtime into the server's plugin container. The server script has access to many [libraries](#plugin-libraries) available in the HollaEx Kit.&#x20;

The most important library of all is the [HollaEx Tools Library](https://github.com/hollaex/hollaex-kit/tree/master/server/utils/hollaex-tools-lib) which has all the main features you need.

{% hint style="info" %}
If at any point, you become unsure of the structure of either your plugin's folders or the code within the files themselves, take a look at the [*hello-exchange*](https://github.com/hollaex/hollaex-kit/tree/master/plugins/src/plugins/hello-exchange) example on GitHub to see how plugin structure should be organized.
{% endhint %}

## Run the Script

{% hint style="warning" %}
Ensure you have executed `npm install` before running the command below.&#x20;

You may also need to add `sudo` at the beginning of the command above depending on your OS.

**In addition**, make sure **CORS has been disabled** on your browser (this can be tricky in Firefox, so Chrome may be easier to work with).command

Finally, for the run comand to work, you will need python 2 on your machine, this can be installed for Linux with sudo apt install python
{% endhint %}

To run the script on your dev mode exchange, you need to go to `/plugins` and run:

```
npm start --plugin=<PLUGIN_NAME>
```

{% hint style="info" %}
Remember this will need to be done in a **new** **terminal** as dev mode will block any input on the terminal it was started on
{% endhint %}

To see if this has worked try accessing localhost:8080/config.json, and you will see the config file of the plugin


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