Byte Code Format to deploy the contract in frontend

I am trying to deploy the nft contract from the front end.
I am building the contract using forc build command from the backend and sending the abi and .bin files to the frontend.
What should be the format of that binary file sent from the backend to the frontend to use that in the code below

const factory = new ContractFactory(byteCode, abi, wallet/provider);
const contract = await factory.deployContract();

The factory will accept a hex string or a byte array. You can use arrayify or hexlify on the .bin file to use it in the FE. Alternatively you can build the project with typegen and it’ll be readily importable to the factory.

I am following this Fuel TS SDK | Fuel Docs

Ah that should be fine then, all doc snippets are taken from a feature test. What problem are you having?

const abi = value?.data?.abi;
        const byteCode = Buffer.from(value?.data.byteCode, "hex");

        const wallet = Wallet.fromAddress(


        const factory = new ContractFactory(byteCode, abi, wallet);

        const contract = await factory.deployContract();

this is the error I am facing

Also, according to the docs

const PRIVATE_KEY = "..."
const provider = await Provider.create(FUEL_NETWORK_URL);
const wallet = Wallet.fromPrivateKey(PRIVATE_KEY, provider);

If I use the fuel wallet extension to make the user connect to the application, is there any other way to create a wallet instance where I can get the unlocked version of fuel wallet


@danielbate Any suggestions how can I solve this.

 "dependencies": {
    "@fuels/connectors": "^0.5.0",
    "axios": "^1.7.2",
    "fuels": "^0.89.2",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
    "react-hot-toast": "^2.4.1",
    "react-icons": "^5.2.1"

these are versions of the fuel related packages

Please could you share the full repo? So the issue is that you are attempting to pass a LockedWallet? For unlocked we need the private key, using the extension we need the user to authorise access using the UI.

@Nazeeh21 @danielbate any suggestions?