I am creating a NFT minter website using the following tutorial https://docs.alchemy.com/alchemy/tutorials/nft-minter . I have followed the tutorial to the last step. I experience an error "tokenURI' is not defined no-undef" when I am trying to run this code in localhost. Do you have any suggestions to resolve the issue?
import React from 'react';
import ReactDOM from 'react-dom';
import {pinJSONToIPFS} from './pinata.js'
require('dotenv').config();
const alchemyKey = process.env.REACT_APP_ALCHEMY_KEY;
const { createAlchemyWeb3 } = require("@alch/alchemy-web3");
const web3 = createAlchemyWeb3(alchemyKey);
const contractABI = require('../contract-abi.json')
const contractAddress = "0x4C4a07F737Bf57F6632B6CAB089B78f62385aCaE";
export const mintNFT = async(url, name, description) => {
//error handling
if (url.trim() == "" || (name.trim() == "" || description.trim() == "")) {
return {
success: false,
status: "❗Please make sure all fields are completed before minting.",
}
}
//make metadata
const metadata = new Object();
metadata.name = name;
metadata.image = url;
metadata.description = description;
//make pinata call
const pinataResponse = await pinJSONToIPFS(metadata);
if (!pinataResponse.success) {
return {
success: false,
status: "😢 Something went wrong while uploading your tokenURI.",
}
}
const tokenURI = pinataResponse.pinataUrl;
}
window.contract = await new web3.eth.Contract(contractABI, contractAddress);
//set up your Ethereum transaction
const transactionParameters = {
to: contractAddress, // Required except during contract publications.
from: window.ethereum.selectedAddress, // must match user's active address.
'data': window.contract.methods.mintNFT(window.ethereum.selectedAddress, tokenURI).encodeABI()//make call to NFT smart contract
};
//sign the transaction via Metamask
try {
const txHash = await window.ethereum
.request({
method: 'eth_sendTransaction',
params: [transactionParameters],
});
return {
success: true,
status: "✅ Check out your transaction on Etherscan: https://ropsten.etherscan.io/tx/" + txHash
}
} catch (error) {
return {
success: false,
status: "😥 Something went wrong: " + error.message
}
}
export const connectWallet = async () => {
if (window.ethereum) {
try {
const addressArray = await window.ethereum.request({
method: "eth_requestAccounts",
});
const obj = {
status: "👆🏽 Write a message in the text-field above.",
address: addressArray[0],
};
return obj;
} catch (err) {
return {
address: "",
status: "😥 " + err.message,
};
}
} else {
return {
address: "",
status: (
<span>
<p>
{" "}
🦊{" "}
<a target="_blank" href={`https://metamask.io/download.html`}>
You must install Metamask, a virtual Ethereum wallet, in your
browser.
</a>
</p>
</span>
),
};
}
};
export const getCurrentWalletConnected = async () => {
if (window.ethereum) {
try {
const addressArray = await window.ethereum.request({
method: "eth_accounts",
});
if (addressArray.length > 0) {
return {
address: addressArray[0],
status: "👆🏽 Write a message in the text-field above.",
};
} else {
return {
address: "",
status: "🦊 Connect to Metamask using the top right button.",
};
}
} catch (err) {
return {
address: "",
status: "😥 " + err.message,
};
}
} else {
return {
address: "",
status: (
<span>
<p>
{" "}
🦊{" "}
<a target="_blank" href={`https://metamask.io/download.html`}>
You must install Metamask, a virtual Ethereum wallet, in your
browser.
</a>
</p>
</span>
),
};
}
};
After checking the docs you linked, it seems you're putting this code outside the function, when instead it should be inside.
import React from 'react';
import { pinJSONToIPFS } from './pinata.js'
require('dotenv').config();
const alchemyKey = process.env.REACT_APP_ALCHEMY_KEY;
const { createAlchemyWeb3 } = require("@alch/alchemy-web3");
const web3 = createAlchemyWeb3(alchemyKey);
const contractABI = require('../contract-abi.json')
const contractAddress = "0x4C4a07F737Bf57F6632B6CAB089B78f62385aCaE";
let tokenURI;
export const mintNFT = async (url, name, description) => {
//error handling
if (url.trim() == "" || (name.trim() == "" || description.trim() == "")) {
return {
success: false,
status: "❗Please make sure all fields are completed before minting.",
}
}
//make metadata
const metadata = new Object();
metadata.name = name;
metadata.image = url;
metadata.description = description;
//make pinata call
const pinataResponse = await pinJSONToIPFS(metadata);
if (!pinataResponse.success) {
return {
success: false,
status: "😢 Something went wrong while uploading your tokenURI.",
}
}
const tokenURI = pinataResponse.pinataUrl;
window.contract = await new web3.eth.Contract(contractABI, contractAddress);
//set up your Ethereum transaction
const transactionParameters = {
to: contractAddress, // Required except during contract publications.
from: window.ethereum.selectedAddress, // must match user's active address.
'data': window.contract.methods.mintNFT(window.ethereum.selectedAddress, tokenURI).encodeABI()//make call to NFT smart contract
};
//sign the transaction via Metamask
try {
const txHash = await window.ethereum
.request({
method: 'eth_sendTransaction',
params: [transactionParameters],
});
return {
success: true,
status: "✅ Check out your transaction on Etherscan: https://ropsten.etherscan.io/tx/" + txHash
}
} catch (error) {
return {
success: false,
status: "😥 Something went wrong: " + error.message
}
}
}
export const connectWallet = async () => {
if (window.ethereum) {
try {
const addressArray = await window.ethereum.request({
method: "eth_requestAccounts",
});
const obj = {
status: "👆🏽 Write a message in the text-field above.",
address: addressArray[0],
};
return obj;
} catch (err) {
return {
address: "",
status: "😥 " + err.message,
};
}
} else {
return {
address: "",
status: (
<span>
<p>
{" "}
🦊{" "}
<a target="_blank" href={`https://metamask.io/download.html`}>
You must install Metamask, a virtual Ethereum wallet, in your
browser.
</a>
</p>
</span>
),
};
}
};
export const getCurrentWalletConnected = async () => {
if (window.ethereum) {
try {
const addressArray = await window.ethereum.request({
method: "eth_accounts",
});
if (addressArray.length > 0) {
return {
address: addressArray[0],
status: "👆🏽 Write a message in the text-field above.",
};
} else {
return {
address: "",
status: "🦊 Connect to Metamask using the top right button.",
};
}
} catch (err) {
return {
address: "",
status: "😥 " + err.message,
};
}
} else {
return {
address: "",
status: (
<span>
<p>
{" "}
🦊{" "}
<a target="_blank" href={`https://metamask.io/download.html`}>
You must install Metamask, a virtual Ethereum wallet, in your
browser.
</a>
</p>
</span>
),
};
}
};
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