# Client Libraries

Metacces uses Geth which supports common smart contract and dapp development, deployment, and operational use cases, using tools such as Hardhat, web3.js and web3js-quorum. The client supports common JSON-RPC API methods, for example eth, net, web3, debug, and miner.

#### Prerequisites​ <a href="#prerequisites" id="prerequisites"></a>

* Node.js version 15 or later.
* The web3 library must be installed in your project.

**web3**[**​**](https://docs.goquorum.consensys.io/develop/client-libraries#web3)

The web3.js library is the most widely used for developing applications.

**Install web3 in your project**[**​**](https://docs.goquorum.consensys.io/develop/client-libraries#install-web3-in-your-project)

npm install web3

**Initialize the web3 client**[**​**](https://docs.goquorum.consensys.io/develop/client-libraries#initialize-the-web3-client)

Initialize your client where:

* <https://oli.accesscan.io> is the JSON-RPC HTTP endpoint of your Metacces node.
* HTTP example

Example connection

`const Web3 = require("web3");`

`const web3 = new Web3("http://oli.accesscan.io");`

### WS example <a href="#ws-example" id="ws-example"></a>

Example connection

const Web3 = require("web3");

const web3 = new Web3("<http://ws.accesscan.io>");

**Deploying a contract**[**​**](https://docs.goquorum.consensys.io/develop/client-libraries#deploying-a-contract)

To deploy a private contract, you need the contract binary. You can use Solidity to get the contract binary.

Copy

```
myContract.deploy({
   data: '0x12345...',
   arguments: [123, 'My String']
})
.send({
   from: '0x1234567890123456789012345678901234567891',
   gas: 1500000,
   gasPrice: '30000000000000'
}, function(error, transactionHash){ ... })
.on('error', function(error){ ... })
.on('transactionHash', function(transactionHash){ ... })
.on('receipt', function(receipt){
 console.log(receipt.contractAddress) // contains the new contract address
})
.on('confirmation', function(confirmationNumber, receipt){ ... })
.then(function(newContractInstance){
   console.log(newContractInstance.options.address) // instance with the new contract address
});
```

Alternatively, you can also deploy a contract using eth.sendSignedTransaction

Copy

```
const rawTxOptions = {
 nonce: "0x00",
 from: account.address,
 to: null, //public tx
 value: "0x00",
 data: "0x" + contractBin + contractConstructorInit,
 gasPrice: "0x0", //ETH per unit of gas
 gasLimit: "0x24A22", //max number of gas units the tx is allowed to use
};
console.log("Creating transaction...");
const tx = new Tx(rawTxOptions);
console.log("Signing transaction...");
tx.sign(Buffer.from(account.privateKey.substring(2), "hex"));
console.log("Sending transaction...");
var serializedTx = tx.serialize();
const pTx = await web3.eth.sendSignedTransaction(
 "0x" + serializedTx.toString("hex").toString("hex"),
);
console.log("tx transactionHash: " + pTx.transactionHash);
console.log("tx contractAddress: " + pTx.contractAddress);
return pTx;
```

**web3 methods**[**​**](https://docs.goquorum.consensys.io/develop/client-libraries#web3-methods)

For more information about the web3 methods, see the web3 reference documentation.


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