Backend wallet with SDK (Node.js)

Use a backend wallet to mint an asset with NodeJS.

You can use backend wallets via Openfort's NodeJS Server SDK (or .net). Follow the instructions below to configure your desired integration.

Set up Openfort Node.js SDK

Open your project in the Openfort Dashboard.

The latest version of the Openfort Node.js server-side SDK supports Node.js versions 14+.

Terminal

mkdir openfort-tutorial
cd openfort-tutorial
npm init -y
npm install @openfort/openfort-node --save
touch index.js

Declare Openfort Environment Variables

After your project is ready, grab your secret_key from the project settings.

Create a .env file and populate it with your project's secret key.

.env

YOUR_SECRET_KEY=sk_test_...

package.json

{
  "name": "node",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "node index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@openfort/openfort-node": "^0.6.10"
  }
}

Create a backend wallet

Backend wallet (dac) can be used for escrow, minting, and transferring assets. You can create a new custodial backend wallet or add your own external account by providing a signature and address.

index.js

const Openfort = require('@openfort/openfort-node').default;
const openfort = new Openfort(process.env.YOUR_SECRET_KEY);
const main = async () => {
  // Create a new custodial backend wallet
  const developerAccount = await openfort.settings.createDeveloperAccount({
    name: "Minting Account"
  });
  
  console.log("Success! Here is your backend wallet id: " + developerAccount.id);
};
main().then(() => process.exit(0));

Add a contract to Openfort

We'll use a simple ERC-721 contract on the Polygon Amoy network.

Once added, Openfort will return a contract id that starts with con_.

Terminal

curl https://api.openfort.xyz/v1/contracts \
  -H "Authorization: Bearer $YOUR_SECRET_KEY" \
  -d chainId=80002 \
  -d address="0x2522F4Fc9aF2E1954a3D13f7a5B2683A00a4543A" \
  -d abi=[
      {
      "inputs": [
        {
          "internalType": "address",
          "name": "_to",
          "type": "address"
        }
      ],
      "name": "mint",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
      }
    ] \
  -d name="Simple NFT"

Mint an NFT using the backend wallet

Use your backend wallet to mint an NFT. The wallet will be used to pay for gas fees.

Make sure to replace the contract id with your own.

index.js

const Openfort = require('@openfort/openfort-node').default;
const openfort = new Openfort(process.env.YOUR_SECRET_KEY);
const main = async () => {
  const developerAccount = await openfort.settings.createDeveloperAccount({
    name: "Minting Account"
  });
  
  const contractId = "con_...";
  const chainId = 80002;
  const optimistic = false;
  const tokenId = '1'; // Token ID to mint, should be unique
  
  const interaction_mint = {
    contract: contractId,
    functionName: "mint",
    functionArgs: [developerAccount.address, tokenId],
  };
  const transactionIntent = await openfort.transactionIntents.create({
    "account": developerAccount.id,
    "chainId": chainId,
    "optimistic": optimistic,
    "interactions": [interaction_mint]
  });
  
  console.log("Success! Here is your transactionIntent id: " + transactionIntent.id);
};
main().then(() => process.exit(0));

Run the script

You're all set! Run the development server on your Terminal.

You can check the transaction details in your dashboard.

Terminal

npm run dev