### Setup react-native-quick-crypto for iOS

Source: https://docs.web3js.org/guides/resources_and_troubleshooting

Run `pod install` in the `ios` directory after installing `react-native-quick-crypto` to link the native dependencies for iOS.

```bash
cd ios && pod install
```

--------------------------------

### Start the React Development Server

Source: https://docs.web3js.org/guides/dapps/metamask-react

This command starts the development server for your React application. Ensure MetaMask is installed and unlocked in the browser where the app will open.

```bash
npm start

```

--------------------------------

### Install Viem

Source: https://docs.web3js.org/guides/migration_viem

Install the Viem package to begin the migration process.

```bash
npm install viem@2  

```

--------------------------------

### Install Web3Modal and Web3.js

Source: https://docs.web3js.org/guides/dapps/web3_modal_guide

Install the necessary packages for Web3Modal and Web3.js using npm. This is the first step before implementation.

```bash
npm install web3modal-web3 web3js  

```

--------------------------------

### web3.eth.getProof Example

Source: https://docs.web3js.org/guides/web3_upgrade_guide/web3_eth_migration_guide

This example demonstrates the expected output format for web3.eth.getProof, showing the key, value, and proof array for different entries.

```javascript
//     {
//       key: '0x0000000000000000000000000000000000000000000000000000000000000000',
//       value: '0x736f6c79656e7420677265656e2069732070656f706c6500000000000000002e',
//       proof: [Array]
//     },
//     {
//       key: '0x0000000000000000000000000000000000000000000000000000000000000001',
//       value: '0x0',
//       proof: [Array]
//     }
//   ]
// }
```

--------------------------------

### Install Ethers.js

Source: https://docs.web3js.org/guides/migration_ethers

Install the ethers.js package to begin the migration process.

```bash
npm install ethers@6  
  

```

--------------------------------

### Install Web3.js with NPM

Source: https://docs.web3js.org/guides/getting_started/quickstart

Install the Web3.js library using NPM for your project. This command installs all sub-packages.

```bash
npm i web3
```

--------------------------------

### Import and Use Web3Eth Directly

Source: https://docs.web3js.org/guides/web3_eth/eth

Import the Web3Eth package directly to reduce build size. This example shows how to get account balances.

```javascript
import { Web3Eth } from 'web3-eth';  
  
const eth = new Web3Eth('http://localhost:7545');  
  
async function test() {  
	const accounts = await eth.getAccounts();  
	const currentBalance = await eth.getBalance(accounts[0]);  
	console.log('Current balance:', currentBalance);  
	// 115792089237316195423570985008687907853269984665640564039437613106102441895127n  
}  
  
(async () => {  
	await test();  
})();  

```

--------------------------------

### Get Account and Storage Proofs with Custom Formatting

Source: https://docs.web3js.org/api/web3-eth/class/Web3Eth

This example demonstrates how to retrieve account and storage proofs with custom formatting for numbers and bytes. By setting `bytes: FMT_BYTES.HEX` and `number: FMT_NUMBER.NUMBER`, you ensure the output is in hexadecimal for bytes and as a BigNumber for numbers. Passing `undefined` for the block parameter defaults to the latest state.

```javascript
web3.eth.getProof(  
    "0x1234567890123456789012345678901234567890",  
    ["0x0000000000000000000000000000000000000000000000000000000000000000","0x0000000000000000000000000000000000000000000000000000000000000001"],  
    undefined,  
    { number: FMT_NUMBER.NUMBER , bytes: FMT_BYTES.HEX }  
).then(console.log);
```

--------------------------------

### Start Local HTTP Server

Source: https://docs.web3js.org/guides/dapps/metamask-vanilla

This command starts a local HTTP server to serve your project files. Ensure you run this in your project directory. The server will automatically refresh the webpage upon detecting changes.

```bash
npx watch-http-server .

```

--------------------------------

### Install web3.js

Source: https://docs.web3js.org/guides/ens

Install web3.js version 4 in your project using npm.

```bash
npm install web3  
```

--------------------------------

### Install Web3.js and Hardhat

Source: https://docs.web3js.org/guides/smart_contracts/smart_contracts_guide

Installs the necessary packages for Web3.js and Hardhat development.

```bash
npm i web3 hardhat  
```

--------------------------------

### Install Web3.js with Yarn

Source: https://docs.web3js.org/guides/getting_started/quickstart

Install the Web3.js library using Yarn for your project. This command installs all sub-packages.

```bash
yarn add web3
```

--------------------------------

### Install Solidity Compiler (solc)

Source: https://docs.web3js.org/guides/smart_contracts/smart_contracts_guide

Install the solc package using npm. Ensure the version is compatible with your Solidity code's pragma directive.

```bash
npm i solc@^0.8.0  

```

--------------------------------

### Install Web3.js and Hardhat

Source: https://docs.web3js.org/guides/transactions/transactions

Install the necessary packages, Web3.js and Hardhat, using npm. These are required for interacting with the blockchain and setting up the development environment.

```bash
npm i web3 hardhat
```

--------------------------------

### Create Tutorial Directory

Source: https://docs.web3js.org/guides/dapps/metamask-vanilla

Create a new directory for the tutorial and navigate into it. This sets up the project structure.

```bash
mkdir web3js-metamask-tutorial
cd web3js-metamask-tutorial
```

--------------------------------

### Initialize and Set Up Web3.js dApp

Source: https://docs.web3js.org/guides/dapps/lightweight-dapp

Install the create-web3js-dapp utility globally, initialize a new minimal React dApp, and navigate into the project directory. This sets up the basic structure for your dApp.

```bash
npm install -g create-web3js-dapp
npx create-web3js-dapp --framework react --template minimal
cd web3js-react-dapp-min
```

--------------------------------

### Get Network ID using web3-net Package

Source: https://docs.web3js.org/api/web3/class/Net

Install the 'web3-net' package and instantiate the Net class directly with your provider URL to get the network ID.

```javascript
import {Net} from 'web3-net';

 const net = new Net('https://mainnet.infura.io/v3/<YOURPROJID>');
 console.log(await net.getId());
```

--------------------------------

### Initialize React Project and Add Dependencies

Source: https://docs.web3js.org/guides/dapps/intermediate-dapp

Set up a new React project with TypeScript and install necessary libraries like Web3.js and Hardhat.

```bash
npx create-react-app web3-intermediate-dapp --template typescript
cd web3-intermediate-dapp

npm i web3

npm i -D hardhat
```

--------------------------------

### Create and Navigate to Project Directory

Source: https://docs.web3js.org/guides/smart_contracts/smart_contracts_guide

Create a new directory for your smart contract project and navigate into it using the command line.

```bash
mkdir smart-contract-tutorial
cd smart-contract-tutorial
```

--------------------------------

### Using personal.getAccounts() from web3-eth-personal

Source: https://docs.web3js.org/libdocs/Personal

This example shows how to get accounts using the dedicated `web3-eth-personal` package.

```APIDOC
## Using personal.getAccounts() from web3-eth-personal

### Description
Retrieves a list of accounts from the Ethereum node using the `Personal` class from `web3-eth-personal`.

### Method
```
personal.getAccounts()
```

### Parameters
None

### Response
#### Success Response
- `Array<string>`: A list of Ethereum account addresses.

### Request Example
```javascript
import { Personal } from 'web3-eth-personal';
const personal = new Personal('http://127.0.0.1:7545');
console.log(await personal.getAccounts());
```
```

--------------------------------

### Get Node Version

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving the version of the Ethereum node software. This can be helpful for debugging and compatibility checks.

```javascript
web3.eth.getNodeInfo().then(console.log);
```

--------------------------------

### Get Gas Price

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving the current gas price on the network. This is essential for estimating transaction fees.

```javascript
web3.eth.getGasPrice().then(console.log);
```

--------------------------------

### Set up web3 and ENS

Source: https://docs.web3js.org/guides/ens

Initialize web3 and access the ENS functionality. Ensure you replace the provider URL with your actual Web3 provider.

```typescript
import Web3 from 'web3';  
  
// Assuming you have a provider, replace 'http://localhost:8545' with your Web3 provider  
const web3 = new Web3('http://localhost:8545');  
  
// You can use ENS with web3 object:  
const ens = await web3.eth.ens.getAddress('alice.eth');  
```

--------------------------------

### Get Balance

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving the Ether balance of a specific account. This is a fundamental operation for checking account funds.

```javascript
web3.eth.getBalance("0x0000000000000000000000000000000000000000").then(console.log);
```

--------------------------------

### Get Transaction

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving details of a specific transaction using its hash. This provides information about the transaction before it was mined.

```javascript
web3.eth.getTransaction("0x95222290dd544201079744315052409217339714073784306917207940132132").then(function(tx){
    console.log(tx);
});
```

--------------------------------

### Initialize and Use Wallet for Transactions

Source: https://docs.web3js.org/libdocs/Wallet

Demonstrates initializing a wallet with multiple accounts and using an account to sign data and send a transaction. Ensure accounts are funded before sending transactions.

```javascript
import { Web3 } from 'web3';
const web3 = new Web3('http://127.0.0.1:7545');

const wallet = await web3.eth.accounts.wallet.create(2);

const signature = wallet.at(0).sign("Test Data"); // use wallet

// fund account before sending following transaction ...

const receipt = await web3.eth.sendTransaction({ // internally sign transaction using wallet
   from: wallet.at(0).address,
   to: "0xdAC17F958D2ee523a2206206994597C13D831ec7",
   value: 1
   //....
});
```

--------------------------------

### Get Network ID

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving the network ID of the connected Ethereum node. This is useful for ensuring the correct network is being interacted with.

```javascript
web3.eth.net.getId().then(console.log);
```

--------------------------------

### Get Accounts

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving a list of accounts available to the Web3 provider. This is typically used with browser-based wallets like MetaMask.

```javascript
web3.eth.getAccounts().then(console.log);
```

--------------------------------

### Initialize web3-eth-accounts Package

Source: https://docs.web3js.org/libdocs/Accounts

Import and use specific functions from the `web3-eth-accounts` package for a more efficient and lightweight application. This is recommended for smaller projects.

```javascript
import {create,hashMessage} from 'web3-eth-accounts';  
  
const account = create();  
const result = hashMessage("Test Message");  
  

```

--------------------------------

### Initialize Web3 Eth with Web3 Package

Source: https://docs.web3js.org/api/web3-eth/class/Web3Eth

Instantiate the Web3 Eth object using the main Web3 package. This approach is suitable when you need access to all Web3 functionalities. Ensure you replace '<YOURPROJID>' with your actual project ID.

```javascript
import { Web3 } from 'web3';
const web3 = new Web3('https://mainnet.infura.io/v3/<YOURPROJID>');

const block = await web3.eth.getBlock(0);
```

--------------------------------

### Get Latest Block Number

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving the number of the most recent block on the chain. This is useful for tracking the current state of the blockchain.

```javascript
web3.eth.getBlockNumber().then(console.log);
```

--------------------------------

### Initialize Web3 and Use ENS

Source: https://docs.web3js.org/api/web3-eth-ens/class/ENS

Instantiate the Web3 class with a provider and then access ENS functionalities through `web3.eth.ens`. This approach is suitable when you are already using the main Web3 instance.

```javascript
import { Web3 } from 'web3';

const web3 = new Web3('https://127.0.0.1:4545');

console.log(await web3.eth.ens.getAddress('ethereum.eth'))
```

--------------------------------

### Get Block By Hash

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving a block's details using its hash. This allows direct access to specific blocks on the chain.

```javascript
web3.eth.getBlock("0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").then(console.log);
```

--------------------------------

### Importing the Entire Web3 Library

Source: https://docs.web3js.org/guides/web3_utils_module

Demonstrates how to import the entire web3 library and access its utility functions, both before and after initializing a provider.

```javascript
// import web3 module  
import { Web3 } from 'web3';  
  
// no need to initialize a provider  
Web3.utils.toHex('web3');  
//=> 0x77656233  
  
// initializing  a provider  
const web3 = new Web3('https:// eth.llamarpc.com');  
  
// access the utils package  
web3.utils.toHex('web3');  
//=> 0x77656233  
```

--------------------------------

### Get Transaction Receipt

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving the receipt for a specific transaction using its hash. The receipt contains information about the transaction's execution.

```javascript
web3.eth.getTransactionReceipt("0x95222290dd544201079744315052409217339714073784306917207940132132").then(function(receipt){
    console.log(receipt);
});
```

--------------------------------

### Initialize Web3 Eth with web3-eth Package

Source: https://docs.web3js.org/api/web3-eth/class/Web3Eth

Instantiate the Web3 Eth object using the dedicated 'web3-eth' package for more lightweight applications. This is efficient for projects that only require Ethereum-specific functionalities. Replace '<YOURPROJID>' with your project ID.

```javascript
import { Web3Eth } from 'web3-eth';

const eth = new Web3Eth('https://mainnet.infura.io/v3/<YOURPROJID>');
const block = await eth.getBlock(0);
```

--------------------------------

### Set and Get Provider in Web3.js

Source: https://docs.web3js.org/api/web3/class/Web3EthPluginBase

Demonstrates how to set and retrieve the current provider for Web3.js. This includes examples of using both HTTP and WebSocket providers.

```javascript
const web3 = new Web3Context("http://localhost:8545");  
console.log(web3.provider);
> HttpProvider {
    clientUrl: 'http://localhost:8545',
    httpProviderOptions: undefined
 }
```

```javascript
const web3Context = new web3ContextContext("http://localhost:8545");  
web3Context.provider = "ws://localhost:8545";  
console.log(web3Context.provider);
> WebSocketProvider {
_eventEmitter: EventEmitter {
_events: [Object: null prototype] {},
_eventsCount: 0,
...
}

}
```

--------------------------------

### Initialize Web3 and Accounts

Source: https://docs.web3js.org/libdocs/Accounts

Instantiate the Web3 library and access accounts functions. This approach uses the full web3 package.

```javascript
import {Web3} from 'web3';  
  
const web3 = new Web3();  
const account = web3.eth.accounts.create();  
const result = web3.eth.accounts.hashMessage("Test Message");  
  

```

--------------------------------

### Instantiate IpcProvider with Options (v4)

Source: https://docs.web3js.org/guides/web3_upgrade_guide/providers_migration_guide

Demonstrates instantiating an IpcProvider in v4, including optional client and reconnection configurations.

```javascript
import { IpcProvider } from 'web3-providers-ipc';  

const provider = new IpcProvider(  
	`path.ipc`,  
	{  
		writable: false,  
	},  
	{  
		delay: 500,  
		autoReconnect: true,  
		maxAttempts: 10,  
	},  
);
```

--------------------------------

### Get Block Transaction Hashes

Source: https://docs.web3js.org/libdocs/Web3Eth

Example of retrieving an array of transaction hashes included in a specific block. This can be used to list all transactions within a block.

```javascript
web3.eth.getBlockTransactionCount("0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef").then(console.log);
```

--------------------------------

### Get Block Information

Source: https://docs.web3js.org/libdocs/Web3Eth

Retrieves detailed information about a specific block on the Ethereum blockchain. This example shows how to fetch block details and format the output.

```javascript
web3.eth.getBlock(
     "0x7dbfdc6a7a67a670cb9b0c3f81ca60c007762f1e4e598cb027a470678ff26d0d",  
     false,
     { number: FMT_NUMBER.NUMBER , bytes: FMT_BYTES.HEX }
).then(console.log);
```

--------------------------------

### Get Ethereum Accounts using Web3.js

Source: https://docs.web3js.org/api/web3/class/Personal

Use the `web3.eth.personal.getAccounts()` method to retrieve a list of accounts managed by the Ethereum node. Ensure you have the Web3 package installed.

```javascript
import { Web3 } from 'web3';
const web3 = new Web3('http://127.0.0.1:7545');
console.log(await web3.eth.personal.getAccounts());
```

--------------------------------

### Get Network ID using Web3.js

Source: https://docs.web3js.org/api/web3/class/Net

Instantiate Web3 with your project ID and use `web3.eth.net.getId()` to retrieve the network ID. Ensure you have installed the Web3 package.

```javascript
import { Web3 } from 'web3';
const web3 = new Web3('https://mainnet.infura.io/v3/<YOURPROJID>');

console.log(await web3.eth.net.getId());
```

--------------------------------

### Example Plugin Package.json

Source: https://docs.web3js.org/guides/web3_plugin_guide/plugin_users

Shows how a plugin is added as a dependency in a project's package.json file.

```json
{
	"dependencies": {
		"web3-plugin-example": "0.1.0"
	}
}
```

--------------------------------

### Get Message to Sign for Signing

Source: https://docs.web3js.org/api/web3-eth-accounts/class/AccessListEIP2930Transaction

Retrieve the serialized unsigned transaction message, which can be used for signing, for example, when sending to a hardware wallet. The raw message format is already serialized and does not require RLP encoding.

```javascript
const serializedMessage = tx.getMessageToSign(false) // use this for the HW wallet input  
```

--------------------------------

### Instantiate IpcProvider with Options (v1.x vs. v4)

Source: https://docs.web3js.org/guides/web3_upgrade_guide/providers_migration_guide

Shows how to instantiate an IpcProvider in version 1.x with a network path and in v4 with client and reconnect options.

```javascript
var net = require('net');  
new Web3.providers.IpcProvider('/Users/myuser/Library/Ethereum/geth.ipc', net); // mac os path  
// on windows the path is: "\\\\.\\pipe\\geth.ipc"  
// on linux the path is: "/users/myuser/.ethereum/geth.ipc"  

// in v4  
let clientOptions: SocketConstructorOpts = {  
	allowHalfOpen: false;  
	readable: true;  
	writable: true;  
};  
  
const reconnectOptions: ReconnectOptions = {  
	autoReconnect: true,  
	delay: 5000,  
	maxAttempts: 5,  
};  
```

--------------------------------

### Initialize Web3 with Web3Eth

Source: https://docs.web3js.org/api/web3/class/Web3Eth

Import the entire Web3 package and initialize it with a provider URL. This makes all Web3 Eth functions available.

```javascript
import { Web3 } from 'web3'; 
const web3 = new Web3('https://mainnet.infura.io/v3/<YOURPROJID>'); 

const block = await web3.eth.getBlock(0);  
```

--------------------------------

### Get Transaction from Block (Custom Format)

Source: https://docs.web3js.org/libdocs/Web3Eth

Fetches a transaction from a specified block, allowing custom formatting for bytes and numbers. This example uses `hexToBytes` for the block hash and specifies `NUMBER` and `HEX` formats for the return data.

```javascript
web3.eth.getTransactionFromBlock(
    hexToBytes("0x30755ed65396facf86c53e6217c52b4daebe72aa4941d89635409de4c9c7f9466d4e9aaec7977f05e923889b33c0d0dd27d7226b6e6f56ce737465c5cfd04be400"),
    0,
    { number: FMT_NUMBER.NUMBER , bytes: FMT_BYTES.HEX }
).then(console.log);
```

--------------------------------

### Initialize Public Client with HTTP Provider

Source: https://docs.web3js.org/guides/migration_viem

Replace Web3.js provider initialization with Viem's `createPublicClient` for network interaction.

```javascript
import Web3 from 'web3';  
  
const web3 = new Web3(providerURL);  

```

```javascript
import { createPublicClient, http } from 'viem';  
  
const client = createPublicClient({ transport: http(providerURL) });  

```

--------------------------------

### Get Proof with Custom Formatting

Source: https://docs.web3js.org/api/web3/interface/Web3EthInterface

Fetches the proof for a given account address and storage keys, specifying custom formatting for number and bytes types. This allows control over how the returned data is represented, for example, as hex strings.

```javascript
web3.eth.getProof(  
    "0x1234567890123456789012345678901234567890",  
    ["0x0000000000000000000000000000000000000000000000000000000000000000","0x0000000000000000000000000000000000000000000000000000000000000001"],  
    undefined,  
    { number: FMT_NUMBER.NUMBER , bytes: FMT_BYTES.HEX }  
).then(console.log);  
```

--------------------------------

### Initialize Hardhat Project

Source: https://docs.web3js.org/guides/hardhat_tutorial

Initializes a new Hardhat project, setting up the basic file structure and configuration.

```bash
npx hardhat init
```

--------------------------------

### Constructor

Source: https://docs.web3js.org/api/web3-eth-accounts/class/Wallet

Initializes a new Wallet instance with a given account provider.

```APIDOC
## Constructor

### `__new Wallet <T>(accountProvider: Web3AccountProvider<T>): Wallet<T>`

#### Type parameters
* **T** : Web3BaseWalletAccount = Web3BaseWalletAccount
#### Parameters
* `accountProvider`: Web3AccountProvider<T>
#### Returns Wallet<T>
```

--------------------------------

### CommonOpts Initialization

Source: https://docs.web3js.org/api/web3-eth-accounts/interface/CommonOpts

Demonstrates how to initialize a Common instance with custom chain configurations.

```APIDOC
## CommonOpts

Options for instantiating a Common instance.

### Properties

*   **chain** (string | number | bigint | object) - Required - Chain name, id, or Chain enum. Can be a supported chain or a custom chain provided via `customChains`.
*   **customChains** (ChainConfig[]) - Optional - Initialize with selected custom chains in addition to supported chains. Custom genesis state should be passed to the Blockchain class if used.
    *Usage Example:*
    ```javascript
    import myCustomChain1 from '[PATH_TO_MY_CHAINS]/myCustomChain1.json'
    const common = new Common({ chain: 'myCustomChain1', customChains: [ myCustomChain1 ]})
    ```
*   **eips** (number[]) - Optional - Selected EIPs to activate. Use an array for instantiation (e.g., `eips: [ 2537, ]`). Currently supported: EIP-2537 - BLS12-381 precompiles.
*   **hardfork** (string) - Optional - String identifier for a hardfork or Hardfork enum. Defaults to `Hardfork.London`.
```

--------------------------------

### Instantiate Web3 with Context Options

Source: https://docs.web3js.org/api/web3/changelog

The Web3 constructor now accepts Web3ContextInitOptions as an alternative to undefined, string, or SupportedProviders.

```javascript
Web3 constructor accepts `Web3ContextInitOptions<EthExecutionAPI, CustomRegisteredSubscription>` as alternative to the still supported `undefined`, `string`, and `SupportedProviders<EthExecutionAPI>` (#6262).
```

--------------------------------

### Instantiate IpcProvider with Options

Source: https://docs.web3js.org/api/web3-providers-ipc/class/IpcProvider

Demonstrates how to instantiate the IpcProvider with a socket path, socket options, and reconnection options. The second and third parameters are optional.

```javascript
const provider = new IpcProvider(
        `path.ipc`,
        {
            writable: false,
        },
        {
            delay: 500,
            autoReconnect: true,
            maxAttempts: 10,
        },
    );
```

--------------------------------

### Create and Add Account to Wallet

Source: https://docs.web3js.org/guides/wallet

Demonstrates how to create a new Ethereum account using web3.eth.accounts.create() and add it to an existing wallet instance. The console output shows the structure of the wallet after the addition.

```javascript
// create a new account and add it to the wallet  
const newAccount = web3.eth.accounts.create();  
wallet.add(newAccount);  
  
console.log(wallet);
```

--------------------------------

### Install Hardhat

Source: https://docs.web3js.org/guides/hardhat_tutorial

Installs the Hardhat development environment in your project using npm.

```bash
npm install hardhat
```

--------------------------------

### Deploy Contract with Viem

Source: https://docs.web3js.org/guides/migration_viem

Example of deploying a contract using Viem's `deployContract` function. Requires a wallet client and provides bytecode, ABI, and constructor arguments.

```javascript
import { createWalletClient, custom } from 'viem';
import { mainnet } from 'viem/chains';

const walletClient = createWalletClient({
	chain: mainnet,
	transport: custom(window.ethereum),
});

const hash = await walletClient.deployContract({
	abi,
	account,
	args: ['constructor param'],
	bytecode: bytecode,
});
```

--------------------------------

### Install TypeScript and Node Types

Source: https://docs.web3js.org/guides/web3_eth/eth

Installs TypeScript and Node.js type definitions for your project.

```bash
npm i typescript @types/node
```

--------------------------------

### Install web3.js ENS package

Source: https://docs.web3js.org/guides/ens

Install the dedicated web3-eth-ens package for direct ENS interactions.

```bash
npm install web3-eth-ens  
```

--------------------------------

### Deploying a Smart Contract Instance

Source: https://docs.web3js.org/guides/smart_contracts/mastering_smart_contracts

Use this to deploy a new contract instance. Ensure you have the contract's bytecode and constructor arguments ready. The default account is obtained from the connected provider.

```javascript
// this will give you the accounts from the connected provider  
// For example, if you are using MetaMask, it will be the account available.  
const providersAccounts = await web3.eth.getAccounts();  
const defaultAccount = providersAccounts[0];  
console.log('deployer account:', defaultAccount);  
  
// NOTE: If you want to manually unlock an account with a private key, you can use wallet.add(privateKey).  
// however, exercise caution and ensure the security of your private keys.  
  
// this is how to obtain the deployer function,  
// so you can estimate its needed gas and deploy it.  
const contractDeployer = myContract.deploy({  
	data: bytecode, // prefix the bytecode with '0x' if it is note already  
	arguments: [1], // provide the parameters in an array; in this case, it's the number `1`.  
});  
  
// optionally, estimate the gas that will be used for development and log it  
const gas = await contractDeployer.estimateGas({  
	from: defaultAccount,  
});  
console.log('estimated gas:', gas);  
  
// Deploy the contract to the Ganache network  
const tx = await contractDeployer.send({  
	from: defaultAccount,  
	gas,  
	gasPrice: 10000000000,  
});  
console.log('Contract deployed at address: ' + tx.options.address);  
```

--------------------------------

### Initialize Web3Eth with Web3 Package

Source: https://docs.web3js.org/libdocs/Web3Eth

Instantiate the Web3 Eth object using the main Web3 package. This requires installing the 'web3' package and initializing it with a provider URL.

```javascript
import { Web3 } from 'web3';
const web3 = new Web3('https://mainnet.infura.io/v3/<YOURPROJID>');

const block = await web3.eth.getBlock(0);

```

--------------------------------

### Instantiate Contract with Individual Packages

Source: https://docs.web3js.org/api/web3/class/Contract

For a more lightweight approach, install and use the `web3-eth-contract` and `web3-core` packages. This is efficient for applications where only contract functionality is needed.

```javascript
import { Web3Context } from 'web3-core';
import { Contract } from 'web3-eth-contract';

const abi = [...] as const; // your contract ABI

let contract = new web3.eth.Contract(
    abi,
    '0xdAC17F958D2ee523a2206206994597C13D831ec7'
     new Web3Context('http://127.0.0.1:8545'));

await contract.methods.balanceOf('0xdAC17F958D2ee523a2206206994597C13D831ec7').call();
```

--------------------------------

### Install Web3.js and Hardhat Plugin

Source: https://docs.web3js.org/guides/hardhat_tutorial

Installs the Web3.js library (version 4) and the hardhat-web3-v4 plugin as development dependencies.

```bash
npm install --save-dev @nomicfoundation/hardhat-web3-v4 'web3@4'
```

--------------------------------

### Instantiate a Smart Contract

Source: https://docs.web3js.org/guides/getting_started/quickstart

Shows how to instantiate a smart contract using its ABI and address. The ABI should contain the function signatures for the methods you intend to call.

```javascript
// Uniswap token smart contract address (Mainnet)  
const address = '0x1f9840a85d5af5bf1d1762f925bdaddc4201f984';  
  
// you can find the complete ABI on etherscan.io  
// https://etherscan.io/address/0x1f9840a85d5af5bf1d1762f925bdaddc4201f984#code  
const ABI = [  
	{
		name: 'symbol',
		outputs: [{ type: 'string' }],
		type: 'function',
	},
	{
		name: 'totalSupply',
		outputs: [{ type: 'uint256' }],
		type: 'function',
	},
];  
  
// instantiate the smart contract  
const uniswapToken = new web3.eth.Contract(abi, address);  

```

--------------------------------

### Start Hardhat Development Network

Source: https://docs.web3js.org/guides/smart_contracts/smart_contracts_guide

Starts the Hardhat local development network. This command must remain running.

```bash
npx hardhat node  
```

--------------------------------

### Web3Eth Initialization and Usage

Source: https://docs.web3js.org/libdocs/Web3Eth

Demonstrates how to install and initialize the Web3Eth module, and use it to retrieve block information.

```APIDOC
## Installation

Install the Web3Eth package using npm or yarn:
```bash
npm i web3-eth
# or
yarn add web3-eth
```

## Initialization

Initialize Web3Eth with a provider URL.

### Example

```javascript
import { Web3Eth } from 'web3-eth';

const eth = new Web3Eth('https://mainnet.infura.io/v3/<YOURPROJID>');
const block = await eth.getBlock(0);
console.log(block);
```

## Accessors

### getBlock

Retrieves a block from the blockchain by its number or hash.

#### Parameters

- **blockNumberOrHash** (number | string): The block number or hash.

#### Returns

- **Promise<Block>** The block object.

### BatchRequest

• `get` **BatchRequest**(): `Object`

Will return the Web3BatchRequest constructor.

#### Returns

`Object`

#### Inherited from

Web3Context.BatchRequest

* * *

### blockHeaderTimeout

• `get` **blockHeaderTimeout**(): `number`

The blockHeaderTimeout is used over socket-based connections. This option defines the amount seconds it should wait for `'newBlockHeaders'` event before falling back to polling to fetch transaction receipt. Default is `10` seconds.

#### Returns

`number`

#### Inherited from

Web3Context.blockHeaderTimeout

• `set` **blockHeaderTimeout**(`val`): `void`

Will set the blockHeaderTimeout

#### Parameters

Name| Type  
---|---
`val`| `number`  

#### Returns

`void`

#### Inherited from

Web3Context.blockHeaderTimeout

* * *

### contractDataInputFill

• `get` **contractDataInputFill**(): `"input"` | `"data"` | `"both"`

The `contractDataInputFill` options property will allow you to set the hash of the method signature and encoded parameters to the property either `data`, `input` or both within your contract. This will affect the contracts send, call and estimateGas methods Default is `data`.

#### Returns

`"input"` | `"data"` | `"both"`

#### Inherited from

Web3Context.contractDataInputFill

• `set` **contractDataInputFill**(`val`): `void`

Will set the contractDataInputFill

#### Parameters

Name| Type  
---|---
`val`| `"input"` | `"data"` | `"both"`  

#### Returns

`void`

#### Inherited from

Web3Context.contractDataInputFill

* * *

### currentProvider

• `get` **currentProvider**(): `undefined` | `Web3BaseProvider`<`API`>

Will return the current provider. (The same as `provider`)

#### Returns

`undefined` | `Web3BaseProvider`<`API`>

Returns the current provider
**`Example`**
```javascript
const web3Context = new Web3Context("http://localhost:8545");
console.log(web3Context.provider);
// > HttpProvider {
// 	clientUrl: 'http://localhost:8545',
// 	httpProviderOptions: undefined
// }
```

#### Inherited from

Web3Context.currentProvider

• `set` **currentProvider**(`provider`): `void`

Will set the current provider. (The same as `provider`)

#### Parameters

Name| Type| Description  
---|---|---
`provider`| `undefined` | `string` | `LegacyRequestProvider` | `LegacySendProvider` | `LegacySendAsyncProvider` | `EIP1193Provider`<`API`> | `Web3BaseProvider`<`API`> | `SimpleProvider`<`API`> | `MetaMaskProvider`<`API`>| SupportedProviders The provider to set  

#### Returns

`void`
**`Example`**
```javascript
const web3Context = new Web3Context("http://localhost:8545");
web3Context.currentProvider = "ws://localhost:8545";
console.log(web3Context.provider);
// > WebSocketProvider {
// _eventEmitter: EventEmitter {
// _events: [Object: null prototype] {},
// _eventsCount: 0,
// ...
// }
```

#### Inherited from

Web3Context.currentProvider

* * *

### defaultAccount

• `get` **defaultAccount**(): `undefined` | `string`

This default address is used as the default `from` property, if no `from` property is specified in for the following methods:
  * web3.eth.sendTransaction()
  * web3.eth.call()
  * myContract.methods.myMethod().call()
  * myContract.methods.myMethod().send()


#### Returns

`undefined` | `string`

#### Inherited from

Web3Context.defaultAccount

• `set` **defaultAccount**(`val`): `void`

Will set the default account.

#### Parameters

Name| Type  
---|---
`val`| `undefined` | `string`  

#### Returns

`void`

#### Inherited from

Web3Context.defaultAccount

* * *

### defaultBlock

• `get` **defaultBlock**(): `BlockNumberOrTag`

The default block is used for certain methods. You can override it by passing in the defaultBlock as last parameter. The default value is `"latest"`.
  * web3.eth.getBalance()
  * web3.eth.getCode()
  * web3.eth.getTransactionCount()
  * web3.eth.getStorageAt()
  * web3.eth.call()
  * myContract.methods.myMethod().call()


#### Returns

`BlockNumberOrTag`

```

--------------------------------

### Custom RPC API Example

Source: https://docs.web3js.org/api/web3/class/Web3PluginBase

Example of defining a custom RPC API specification and extending Web3PluginBase with it for type support.

```APIDOC
## Custom RPC API Definition

### Description
Define a TypeScript interface to specify custom RPC methods and their signatures. This allows for type-safe interactions with RPC endpoints that support these custom methods.

### Usage
```typescript
type CustomRpcApi = {
    custom_rpc_method: () => string;
    custom_rpc_method_with_parameters: (parameter1: string, parameter2: number) => string;
};

class CustomPlugin extends Web3PluginBase<CustomRpcApi> { ... }
```

### Parameters
*   **CustomRpcApi** (type): An interface defining the custom RPC methods available.
    *   **custom_rpc_method**: A method that takes no arguments and returns a string.
    *   **custom_rpc_method_with_parameters**: A method that accepts a string and a number, returning a string.
```

--------------------------------

### Install rn-nodeify for BigInt Polyfill

Source: https://docs.web3js.org/guides/resources_and_troubleshooting

Install `rn-nodeify` as a development dependency to help resolve BigInt-related errors in React Native projects.

```bash
yarn add --dev rn-nodeify
```

--------------------------------

### Initialize Iban with Web3 Package

Source: https://docs.web3js.org/api/web3-eth-iban/class/Iban

Instantiate the Iban class using the Web3 package. Ensure Web3 is installed and configured with a provider.

```javascript
import { Web3 } from 'web3';
const web3 = new Web3('https://mainnet.infura.io/v3/<YOURPROJID>');
const iban = new web3.eth.Iban("XE81ETHXREGGAVOFYORK");
console.log(iban.checksum());
```

--------------------------------

### Initialize Web3Eth with web3-eth Package

Source: https://docs.web3js.org/libdocs/Web3Eth

Instantiate the Web3Eth object directly using the 'web3-eth' package for a more lightweight application. This requires installing 'web3-eth' and initializing it with a provider URL.

```javascript
import { Web3Eth } from 'web3-eth';

const eth = new Web3Eth('https://mainnet.infura.io/v3/<YOURPROJID>');
const block = await eth.getBlock(0);

```

--------------------------------

### Get Filter Changes - Web3.eth

Source: https://docs.web3js.org/api/web3/class/Web3Eth

Retrieves changes for a specific filter. Use this to get logs that have occurred since the last call.

```javascript
web3.eth.getFilterChanges(123).then(console.log);
> [{
      data: '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385',
      topics: ['0xfd43ade1c09fade1c0d57a7af66ab4ead7c2c2eb7b11a91ffdd57a7af66ab4ead7', '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385']
      logIndex: 0n,
      transactionIndex: 0n,
      transactionHash: '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385',
      blockHash: '0xfd43ade1c09fade1c0d57a7af66ab4ead7c2c2eb7b11a91ffdd57a7af66ab4ead7',
      blockNumber: 1234n,
      address: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'
  },
  {...}]
```

--------------------------------

### Create and Use Wallet Accounts

Source: https://docs.web3js.org/api/web3-eth-accounts/class/Wallet

Demonstrates creating a wallet with multiple accounts, signing data with a specific account, and sending a transaction using an account from the wallet. Ensure accounts are funded before sending transactions.

```javascript
import { Web3 } from 'web3';
const web3 = new Web3('http://127.0.0.1:7545');

const wallet = await web3.eth.accounts.wallet.create(2);

const signature = wallet.at(0).sign("Test Data"); // use wallet

// fund account before sending following transaction ...

const receipt = await web3.eth.sendTransaction({
   from: wallet.at(0).address,
   to: "0xdAC17F958D2ee523a2206206994597C13D831ec7",
   value: 1
   //....
});
```

--------------------------------

### Install react-native-quick-crypto

Source: https://docs.web3js.org/guides/resources_and_troubleshooting

Install `react-native-quick-crypto` as a dependency to resolve 'TypeError: Cannot read property \'prototype\' of undefined' errors when using Web3.js with React Native.

```bash
yarn add react-native-quick-crypto
```