Blockchain Development: Convert An App To A Dapp (2025)

Install node package modules and Express, test with Posman, and use Bowsman with MySQL to fetch data for the browser; install node one to restart Narges on any coaching.

Install and configure MySQL and MySQL Workbench, connect to a local server, set a password, and prepare a database for future lectures.

Launch MySQL Workbench, create a database named Web app, paste the table creation statement, verify the table exists, and prepare to push data in the next lecture.

students write their first database query to save user information using promises and async/await, inserting email and password into a mysql table, and test with postman.

Add input fields for amount and email and a pay button to save funds to the database, while initializing total amount in state with a React constructor.

Post user data with axios from a browser form, capturing amount and email, and submit to the server to store in the database.

Set up a PayPal based funding gateway by creating a lottery manager and participant, obtaining sandbox REST API credentials, and integrating the PayPal SDK to connect to a sandbox environment.

Install the PayPal SDK with npm install and configure it using your client ID and secret from sandbox. Create payment, redirect to PayPal, confirm it in-app, and push to GitHub.

Implement the big winner functionality for a lottery dapp by fetching the total amount from participants, preparing a winner selection, and outlining the transfer to the winner’s wallet.

Learn to implement delete all users functionality in a dapp, export the function, and delete records where id > 0, then test by creating users and pushing code to GitHub.

Transform your app into a polished decentralized interface by applying bootstrap, adding the latest bootstrap scripts and a custom index.css, and sharing the code via GitHub for reuse.

Transition from a Web 2.0 lottery web application to a decentralized application, embracing Web 3.0 and inviting questions and feedback in the decentralized world.

Understand gas as the fee for using the Ethereum network. Learn how gas applies when deploying contracts or calling payable functions, and how miners validate and prioritize higher gas bids.

Enforce a minimum 0.01 ether entry in a lottery app using a Solidity require statement, inspect MSG value and sender, redeploy the contract, and debug failing transactions.

Use the remakes debugger to trace solidity contract errors, deploy iterations, and locate where the require statement crashes by stepping through functions with a slider.

Create a private sha-256 based random function using block difficulty and current time. Generate a long string and use modulus to select the winner.

Transfer the smart contract balance to the lottery winner and reset the participants array after payout, using index logic to select the winner and prepare for a test network rollout.

Set up the decentralized lottery project workspace, initialize folders and package.json, import Remix contracts, and install React, Next, wallet provider, to connect to a network and render pages.

Create a public Web 3.0 repository for the decentralized lottery app, push contracts, package.json, and lock files to GitHub, and run npm install to auto fetch node_modules.

Set up pages with next by creating a pages folder, building and exporting a lottery component, and running the app on localhost to prepare loading lottery contracts in next lecture.

Fund participants fund a lottery app using metamask by entering ether to participate, validate amounts, convert to wei with Web3 utils, and send to the contract with real-time status updates.