Deploy a contract

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Deploy a contract

This document describes deploying an ERC721 contract to an Ethereum testnet.
Ensure you installed the NFT SDK, and have your Infura Web3 authentication details available.
Prerequisites
dotenv
Use the dotenv library to manage authentication credentials.
npm install dotenv
Authentication
Create a .env file at the project root and add the following data:
INFURA_PROJECT_ID=<API-KEY>
INFURA_PROJECT_SECRET=<API-KEY-SECRET>
WALLET_PUBLIC_ADDRESS=<WALLET-PUBLIC-ADDRESS>
WALLET_PRIVATE_KEY=<WALLET-PRIVATE-KEY>
Replace the Infura project credential placeholders with your own. 
Add a public and private Ethereum address for testing on the supported network the application will run on.
Fund your Ethereum account
Make sure you have enough test ETH to pay the fees.
Try the https://faucet.paradigm.xyz/ faucet to get test ETH.
Create NFT content
Every contract and minted NFT has metadata that describes it.
Metadata information must be accessible via a public URI and resolve to a well-formed json file.
Metadata
The ERC721 contract metadata file contains store-front information for NFT collections.
Create a new file, e.g. metadata.json, and add the details. For example:
{
	"name": "ConsenSys NFT SDK contract demo",
	"description": "Welcome to the ConsenSys NFT SDK demo store-front.",
	"image": "https://bafybeih6oxo5mbvqibbvji3cj7tqs7sitktkeatqwtiynv6ppkze7m6rui.ipfs.infura-ipfs.io/",
	"external_link": "https://consensys.net/"
}
NFT content and metadata
Use Infura to add the NFT metadata and image content to IPFS.
Image
We have used the following image for our store-front: https://bafybeih6oxo5mbvqibbvji3cj7tqs7sitktkeatqwtiynv6ppkze7m6rui.ipfs.infura-ipfs.io/ and added the details to the metadata.json file above.
For more information on ERC721 metadata json schemas, check out the OpenZeppelin docs.
metadata.json
We uploaded the metadata.json file to Infura IPFS in the same way:
https://bafybeiesrdovwqtcueo2cflwtgkurjkvvvnufwwp2dlnnbsxmnwezdrali.ipfs.infura-ipfs.io/​
Deploy the contract
Create a new script
From the project root, create a new script.
touch index.js
Import the libraries and load the environment variables
import { config as loadEnv } from 'dotenv';
import { SDK, Auth, TEMPLATES } from '@infura/sdk';
​
loadEnv();
Create an Auth object
The SDK wraps authentication parameters in an Auth object which is passed to the constructor.
Check the documentation for the current list of supported networks and add the relevant chainId.
const auth = new Auth({
      projectId: process.env.INFURA_API-KEY,
      secretId: process.env.INFURA_API-KEY_SECRET,
      privateKey: process.env.WALLET_PRIVATE_KEY,
      chainId: 5,
    });
Instantiate the SDK
The SDK constructor takes an Auth object.
const sdk = new SDK(auth);
Deploy the NFT contract
The SDK uses the ERC721Mintable contract template to deploy the NFT contract.
const newContract = await sdk.deploy({
   template: TEMPLATES.ERC721Mintable,
   params: {
     name: 'NFT contract',
     symbol: 'CNSYS',
     contractURI: 'https://bafybeiesrdovwqtcueo2cflwtgkurjkvvvnufwwp2dlnnbsxmnwezdrali.ipfs.infura-ipfs.io/',
   },
 });
console.log(`Contract address is: ${newContract.contractAddress}`);
Run with Node
node index.js
Example output:
Contract address is: 0x5C6464F1a1e9cB4c895F6A85691A80d230d605d4