Building a decentralized application dapp with web3 ?
Published: 2023-04-18 06:28:19

Building a decentralized application (dapp) with web3 involves several steps, from designing the smart contract to deploying it on the Ethereum blockchain. Here is a more detailed guide on how to build a dapp with web3:

The core Web 3.0 applications depend on the decentralization of the applications and advanced technologies like blockchain, AI, AR, VR, and others. As a leading [Web 3.0 development company](https://blockchainatic.com/web3-development-company/), we have been working with blockchain-based products and applications for a long time now.

**1. Choose a development framework: **As mentioned earlier, you can choose a web3 development framework such as Truffle, Embark, or Brownie. For this example, we will use Truffle.

**2. Install the necessary software:** To use Truffle, you need to install Node.js and the Truffle CLI. You can do this by running the following commands in your terminal:

```
$ sudo apt-get update
$ sudo apt-get install nodejs
$ sudo npm install -g truffle

```

**3. Create a new project:** Once you have installed Truffle, you can create a new project by running the following command in your terminal:

```
$ truffle init

```
This will create a new Truffle project with a basic directory structure.

**4. Write your smart contract:** The smart contract is the core of your dapp, and it defines the rules and logic of your application. You can write your contract using Solidity, the most popular programming language for Ethereum smart contracts. For this example, we will create a simple smart contract that stores a string:

```
pragma solidity ^0.8.0;

contract MyContract {
  string private data;

  function setData(string memory _data) public {
    data = _data;
  }

  function getData() public view returns (string memory) {
    return data;
  }
}

```

**5. Compile and deploy your smart contract:** To compile your smart contract, run the following command in your terminal:

```
$ truffle compile

```


This will create a compiled version of your contract in the build/contracts directory.

To deploy your contract on the Ethereum blockchain, you need to create a migration script. Create a new file called 2_deploy_contracts.js in the migrations directory, and add the following code:


```
const MyContract = artifacts.require("MyContract");

module.exports = function (deployer) {
  deployer.deploy(MyContract);
};

```

**6. Build the frontend:** After deploying your contract, you can build the frontend of your dapp. For this example, we will create a simple HTML page with a form to set and get the stored data:

```
<!DOCTYPE html>
<html>
  <head>
    <title>My Dapp</title>
    <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
  </head>
  <body>
    <h1>My Dapp</h1>
    <form>
      <input type="text" id="inputData" placeholder="Enter data">
      <button type="button" onclick="setData()">Set Data</button>
      <button type="button" onclick="getData()">Get Data</button>
    </form>
    <p id="outputData"></p>
    <script>
      const contractAddress = "0x1234567890123456789012345678901234567890";
      const abi = [
        {
          "inputs": [],
          "name": "getData",
          "outputs": [
            {
              "internalType": "string",
              "name": "",
              "type": "string"
            }
          ],
          "stateMutability": "view",
          "type": "function"
        },
        {
          "inputs": [
            {
              "internalType": "string",
              "name": "_data",
              "type": "string"
            }
          ],
          "name": "setData",
          "outputs": [],
          "state

```