> For the complete documentation index, see [llms.txt](https://docs.exsat.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.exsat.network/guides-of-data-consensus/others/operation-references/preparation-before-you-start/prerequisites.md).

# Prerequisites

Some commands may need the root account permission to execute, please use sudo as needed, or just start the client as root:

```
sudo -i
```

### Running from source code

If you wish to run the client from source code, please install the following dependences.

### Node.js

Running the Client requires installing Node.js. 

#### Check if Node.js is Installed

Open a terminal window.

To check if Node.js is installed, run the following command:

```
node -v
```

If Node.js is installed, the terminal will display the version number, such as `v20.15.1`.

1. If Node.js is installed, ensure that the version is `20.15.1` or higher.
2. If the installed version is lower than `20.15.1` or it is not installed, proceed to the installation below.

#### Install Node.js Version 20.15.1

To install Node.js version 20.15.1, first ensure your system is updated:

```
sudo apt update
```

Install Node.js from the NodeSource repository:

```
curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash -
sudo apt install -y nodejs
```

Verify the installation by checking the Node.js version again:

```
node -v
```

This should return v20.15.1 or a higher version if installed successfully.

### Git

#### Check if Git is Installed

To check if Git is installed, run the following command in the terminal:

```
git --version
```

If Git is installed, the terminal will display the version number, such as `git version 2.25.1`.

#### Install Git if Not Installed

If Git is not installed, you can install it by running the following commands:

```
sudo apt update
sudo apt install -y git
```

Verify the installation by checking the Git version:

```
git --version
```

This should return the version number of Git, confirming the installation.

​ 

### Yarn

#### Check if Yarn is Installed

Open a terminal window.

Check if Yarn is installed by running:

```
yarn -v
```

#### Install Yarn if Not Installed

If Yarn is not installed, add the Yarn repository and install it:

```
npm install -g yarn
```

Verify the installation by checking the Yarn version:

```
yarn -v
```

By following these steps, you will ensure that both Node.js (version `20.15.1` or higher) ,Git and Yarn are installed and properly configured on your system.

### Running with Docker

If you wish to run the client with docker, please install docker.

1. **Download and Run the Official Installation Script**

   Docker provides a convenient installation script that you can download and run with the following commands:

   ```sh
   curl -fsSL https://get.docker.com -o get-docker.sh
   sh get-docker.sh
   ```
2. **Verify the Docker Installation**

   Check the Docker version to confirm that the installation was successful:

   ```sh
   docker --version
   ```