> For the complete documentation index, see [llms.txt](https://opnet-testnet.gitbook.io/start/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://opnet-testnet.gitbook.io/start/deploying-a-token.md).

# Deploying a Token

To deploy a token, you can visit the link below to view an overview of what to do, or view the guide below the link.

{% embed url="<https://github.com/btc-vision/OP_20>" %}

### **Prerequisites**

* Have node.js installed (<https://nodejs.org/en/download>)
* Have npm (Node package manager) installed (<https://docs.npmjs.com/downloading-and-installing-node-js-and-npm>)
* Have OP\_Wallet installed (<https://chromewebstore.google.com/detail/opwallet/pmbjpcmaaladnfpacpmhmnfmpklgbdjb>)
* Have an IDE such as VS Code, (you can use textedit or notepad but an IDE is recommended)

### **Downloading the template to edit the contract**

Head to the github link at the top of the page, and either clone the github repo in your selected directory:

`git clone https://github.com/btc-vision/OP_20.git`

or download directly by clicking the green "code" button and downloading as ZIP:

<figure><img src="/files/Tx710JqxJq9SvttNiIxA" alt="" width="563"><figcaption></figcaption></figure>

If you're using an IDE, open the OP20 folder and navigate to src/contracts/MyToken.ts. If you're going to use a text editor, find the MyToken.ts file and open it in a text editor.

<figure><img src="/files/T5ggd8R6M5f7XkkM6wRx" alt=""><figcaption></figcaption></figure>

### **Editing the parameters and building the contract**

This step is crucial for customizing your OP\_20 token. You will need to adjust several key properties such as `maxSupply`, `decimals`, `name`, and `symbol`.

Here’s what each property means and how you can customize it:

1. **`maxSupply`**:

* This defines the total supply of your token.
* It’s a `u256` value representing the maximum number of tokens that will ever exist.
* The number should include the full number of decimals.
* **Example**: If you want a total supply of 1,000,000 tokens with 18 decimals, the value should be `1000000000000000000000000`.

```
const maxSupply: u256 = u128.fromString('1000000000000000000000000').toU256(); // 1,000,000 tokens with 18 decimals
```

2. **`decimals`**:

* This property defines how divisible your token is.
* A value of `18` means the token can be divided down to 18 decimal places, similar to how Ethereum handles its tokens.

```
const decimals: u8 = 18; // Your decimals
```

3. **`name`**:

* The `name` is a string representing the full name of your token.
* This will be displayed in wallets and exchanges.

```
const name: string = 'YourTokenName'; // e.g., 'My Custom Token'
```

4. **`symbol`**:

* The `symbol` is a short string representing the ticker symbol of your token.
* Similar to how "BTC" represents Bitcoin.

```
const symbol: string = 'SYM'; // e.g., 'MYT'
```

**Modifying the Contract Code**

Open the `OP_20` template repository in your IDE or text editor and navigate to `src/contracts/MyToken.ts`. Look for the following section in the `onInstantiated` method:

```
const maxSupply: u256 = u128.fromString('1000000000000000000000000').toU256(); // Your max supply
const decimals: u8 = 18; // Your decimals
const name: string = 'YourTokenName'; // Your token name
const symbol: string = 'SYM'; // Your token symbol
```

Modify the values as needed for your token.

### Install Dependencies and Build

After customizing your token's properties, build the contract:

* Open your terminal and navigate to the location of the downloaded `OP_20` template folder.
* Run the following commands:

  ```
  npm install
  npm run build
  ```
* After building, a `build` folder will be created in the root of the `OP_20` folder. Look for `[nameoftoken].wasm` for the compiled contract.

#### Deploy the Token Contract

* Open the OP\_WALLET extension and select the "deploy" option.

<figure><img src="/files/aMZ2X7xpdqEps0nnkXz3" alt="" width="267"><figcaption></figcaption></figure>

* Drag your `.wasm` file or click to choose and upload it.

<figure><img src="/files/lkR3kaQlnQZSocnHz5ET" alt="" width="563"><figcaption></figcaption></figure>

* Send your transaction to deploy the token contract.

### Minting tokens

After the deployment is completed, it should be visitble in your imported tokens list.&#x20;

To mint tokens, select the token, and click the Mint button.

<figure><img src="/files/Cqf5L2YyQ45UQYp9Ups5" alt="" width="260"><figcaption></figcaption></figure>

Then select the amount of tokens you wish to mint.

<figure><img src="/files/EpKTGYIOIxo9w2MCZezG" alt="" width="264"><figcaption></figcaption></figure>

Click Next, and then sign the transaction.