# Minting with viem

For developers who prefer granular control over the minting process, you can use vanilla TypeScript with [viem](https://viem.sh/), a TypeScript interface for EVM-based projects. The [Ethers.js library](https://ethers.org/) is also a robust approach.

Going *vanilla* requires you to perform a bit more work than when relying on frameworks such as thirdweb. For instance, unless you run your own IPFS node, you will need to rely on an NFT storage platforms, which are for-pay.

{% hint style="success" %}
This example uses [Pinata](https://pinata.cloud/) as an IPFS host.\
You will also need to deploy an [OpenZeppelin ERC-721 contract](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol) on Chiliz Chain yourself. [Remix IDE](https://remix.ethereum.org/) gives you an in-browser to do it. Don't forget to verify the contract using a block explorer!
{% endhint %}

Now, let's install `viem`, the `Pinata SDK`, and the `dotenv` module:

```bash
npm i viem pinata dotenv
```

Configure your `.env` file to work with your needs:

```
# Wallet / contract
PRIVATE_KEY=0xabc...                      # server-side only
CONTRACT_ADDRESS=0xYourErc721Address
RECIPIENT=0xRecipientOrLeaveEmpty         # optional; defaults to minter

# Pinata
PINATA_JWT=eyJhbGciOi...                  # JWT from Pinata dashboard
PINATA_GATEWAY=your-subdomain.mypinata.cloud

# Single mint
IMAGE_PATH=./art/image.png
NAME=My Chiliz NFT
DESCRIPTION=Minted on Chiliz with viem

# Batch mint
IMAGES_DIR=./art
NAME_PREFIX=My Chiliz NFT
BATCH_DESCRIPTION=Batch minted on Chiliz with viem
```

Now, let's dive into the code.\
\&#xNAN;*Take inspiration from it, don't use as-is!*

## Minting a single NFT

{% code overflow="wrap" lineNumbers="true" fullWidth="true" %}

```typescript
import 'dotenv/config';
import fs from 'fs';
import path from 'path';

import { createWalletClient, createPublicClient, http, parseEventLogs } from 'viem';
import { privateKeyToAccount } from 'viem/accounts';
import type { Address } from 'viem';
import { chiliz, spicy } from 'viem/chains';
import { PinataSDK } from 'pinata';

// Minimal ABI: safeMint(to, uri) + tokenURI + Transfer
const abi = [
  { type: 'function', name: 'safeMint', stateMutability: 'nonpayable',
    inputs: [{ name: 'to', type: 'address' }, { name: 'uri', type: 'string' }], outputs: [] },
  { type: 'function', name: 'tokenURI', stateMutability: 'view',
    inputs: [{ name: 'tokenId', type: 'uint256' }], outputs: [{ type: 'string' }] },
  { type: 'event', name: 'Transfer',
    inputs: [
      { name: 'from', type: 'address', indexed: true },
      { name: 'to', type: 'address', indexed: true },
      { name: 'tokenId', type: 'uint256', indexed: true },
    ]},
] as const;

function guessMime(p: string) {
  const ext = path.extname(p).toLowerCase();
  if (ext === '.png') return 'image/png';
  if (ext === '.jpg' || ext === '.jpeg') return 'image/jpeg';
  if (ext === '.webp') return 'image/webp';
  if (ext === '.gif') return 'image/gif';
  if (ext === '.mp4') return 'video/mp4';
  if (ext === '.webm') return 'video/webm';
  return 'application/octet-stream';
}

async function main() {
  // Choose your network: use `spicy` for Chiliz testnet, switch to `chiliz` for Chiliz Chain Mainnet.
  const chain = spicy; // Change to `chiliz` for Mainnet

  const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
  const walletClient = createWalletClient({ account, chain, transport: http() });
  const publicClient = createPublicClient({ chain, transport: http() });

  const address = process.env.CONTRACT_ADDRESS as Address;
  const recipient = (process.env.RECIPIENT as Address) || account.address;

  // IPFS upload (Pinata)
  const pinata = new PinataSDK({
    pinataJwt: process.env.PINATA_JWT!,
    pinataGateway: process.env.PINATA_GATEWAY!,
  });

  const filePath = process.env.IMAGE_PATH!;
  const fileBlob = new Blob([fs.readFileSync(filePath)], { type: guessMime(filePath) });
  const fileObj = new File([fileBlob], path.basename(filePath), { type: guessMime(filePath) });

  const up = await pinata.upload.public.file(fileObj);
  const imageUri = `ipfs://${up.cid}`;

  const meta = await pinata.upload.public.json({
    name: process.env.NAME!,
    description: process.env.DESCRIPTION!,
    image: imageUri,
  });
  const metadataUri = `ipfs://${meta.cid}`;

  // Mint on-chain via viem
  const txHash = await walletClient.writeContract({
    address,
    abi,
    functionName: 'safeMint',
    args: [recipient, metadataUri],
  });

  const receipt = await publicClient.waitForTransactionReceipt({ hash: txHash });

  const ZERO = '0x0000000000000000000000000000000000000000';
  const logs = parseEventLogs({ abi, logs: receipt.logs, eventName: 'Transfer' });
  const mintLog = logs.find(l => (l.args as any).from?.toLowerCase?.() === ZERO);
  const tokenId = mintLog ? (mintLog.args as any).tokenId : undefined;

  console.log('tx:', txHash, '| tokenId:', tokenId ?? '(not parsed)', '| tokenURI:', metadataUri);
}

main().catch(err => (console.error(err), process.exit(1)));

```

{% endcode %}

## Minting a collection of NFTs

{% code overflow="wrap" lineNumbers="true" fullWidth="true" %}

```typescript
import 'dotenv/config';
import fs from 'fs';
import path from 'path';
// import { Blob } from 'buffer'; // Node 18: uncomment the next line to get Blob.

import { createWalletClient, createPublicClient, http, parseEventLogs } from 'viem';
import { privateKeyToAccount } from 'viem/accounts';
import type { Address } from 'viem';
import { chiliz, spicy } from 'viem/chains';
import { PinataSDK } from 'pinata';

// Minimal ABI: safeMint(to, uri) + tokenURI + Transfer
const abi = [
  { type: 'function', name: 'safeMint', stateMutability: 'nonpayable',
    inputs: [{ name: 'to', type: 'address' }, { name: 'uri', type: 'string' }], outputs: [] },
  { type: 'function', name: 'tokenURI', stateMutability: 'view',
    inputs: [{ name: 'tokenId', type: 'uint256' }], outputs: [{ type: 'string' }] },
  { type: 'event', name: 'Transfer',
    inputs: [
      { name: 'from', type: 'address', indexed: true },
      { name: 'to', type: 'address', indexed: true },
      { name: 'tokenId', type: 'uint256', indexed: true },
    ]},
] as const;

function guessMime(p: string) {
  const ext = path.extname(p).toLowerCase();
  if (ext === '.png') return 'image/png';
  if (ext === '.jpg' || ext === '.jpeg') return 'image/jpeg';
  if (ext === '.webp') return 'image/webp';
  if (ext === '.gif') return 'image/gif';
  if (ext === '.mp4') return 'video/mp4';
  if (ext === '.webm') return 'video/webm';
  return 'application/octet-stream';
}

async function main() {
  // Choose your network: use `spicy` for Chiliz testnet, switch to `chiliz` for Mainnet.
  const chain = spicy; // Change to `chiliz` for Mainnet

  const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
  const walletClient = createWalletClient({ account, chain, transport: http() });
  const publicClient = createPublicClient({ chain, transport: http() });

  const address = process.env.CONTRACT_ADDRESS as Address;
  const recipient = (process.env.RECIPIENT as Address) || account.address;

  // IPFS upload (Pinata)
  const pinata = new PinataSDK({
    pinataJwt: process.env.PINATA_JWT!,
    pinataGateway: process.env.PINATA_GATEWAY!, // optional; not needed for ipfs:// URIs
  });

  const filePath = process.env.IMAGE_PATH!;
  const fileBlob = new Blob([fs.readFileSync(filePath)], { type: guessMime(filePath) });

  // Pass a Blob directly
  const up = await pinata.upload.public.file(fileBlob);
  const imageUri = `ipfs://${up.cid}`;

  const meta = await pinata.upload.public.json({
    name: process.env.NAME!,
    description: process.env.DESCRIPTION!,
    image: imageUri,
  });
  const metadataUri = `ipfs://${meta.cid}`;

  // Mint on-chain via viem
  const txHash = await walletClient.writeContract({
    address,
    abi,
    functionName: 'safeMint',
    args: [recipient, metadataUri],
  });

  const receipt = await publicClient.waitForTransactionReceipt({ hash: txHash });

  const ZERO = '0x0000000000000000000000000000000000000000';
  const logs = parseEventLogs({ abi, logs: receipt.logs, eventName: 'Transfer' });
  const mintLog = logs.find(l => (l.args as any).from?.toLowerCase?.() === ZERO);
  const tokenId = mintLog ? (mintLog.args as any).tokenId : undefined;

  console.log('tx:', txHash, '| tokenId:', tokenId ?? '(not parsed)', '| tokenURI:', metadataUri);
}

main().catch(err => (console.error(err), process.exit(1)));

```

{% endcode %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.chiliz.com/develop/advanced/work-with-nfts/minting-with-viem.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.