What you will be building, see the at Bitfinity test network and the . live demo git repo Introduction Welcome to this comprehensive guide where we'll build a Web3 Decentralized Charity Platform using Next.js, Solidity, and TypeScript. By the end of this tutorial, you'll have a clear understanding of: Building dynamic interfaces with Next.js Crafting Ethereum smart contracts with Solidity Incorporating static type checking using TypeScript Deploying and interacting with your smart contracts Understanding the fundamentals of blockchain-based charity platforms As a bonus for partaking in this tutorial, you can easily win a copy of our prestigious book on becoming an in-demand developer. This offer is free for the first , for instructions on how to win watch the short video below. solidity 300 people Prerequisites You will need the following tools installed to build along with me: Node.js Yarn Git Bash MetaMask Next.js Solidity Redux Toolkit Tailwind CSS To set up MetaMask for this tutorial, please watch the instructional video below: https://www.youtube.com/watch?v=qV1mbFOtkxo&embedable=true Once you have completed the setup, you are eligible to receive a free copy of our book. To claim your book, . please fill out the form to submit your proof-of-work Watch the following to receive up to 3-months of free premium courses on instructional videos Dapp Mentors Academy, including: Fullstack NFT Minting Course Fullstack NFT Marketplace Course Fullstack Blockchain Course etc. Start your journey with Bitfinity today. Experience a fast, simple, and hassle-free development process as you build your first Charity Donation Tracking dApp. Deploy your smart contracts to the Bitfinity network and make a positive impact. With that said, let’s jump into the tutorial and set up our project. Setup We'll start by cloning a prepared frontend repository and setting up the environment variables. Run the following commands: git clone https://github.com/Daltonic/dappFundsX
cd dappFundsX
yarn install
git checkout no_redux_no_blockchain Next, create a file at the root of the project and include the following keys: .env NEXT_PUBLIC_RPC_URL=http://127.0.0.1:8545
NEXT_PUBLIC_ALCHEMY_ID=<YOUR_ALCHEMY_PROJECT_ID>
NEXT_PUBLIC_PROJECT_ID=<WALLET_CONNECT_PROJECT_ID>
NEXTAUTH_URL=http://localhost:3000
NEXTAUTH_SECRET=somereallysecretsecret Replace and with your respective project IDs. <YOUR_ALCHEMY_PROJECT_ID> <WALLET_CONNECT_PROJECT_ID> : : YOUR_ALCHEMY_PROJECT_ID Get Key Here WALLET_CONNECT_PROJECT_ID Get Key Here Finally, run to start the project. yarn dev Our frontend for this project is solid and ready for some smart contract integration, but we will need Reduxify our application to enable a shared data space. Building the Redux Store The above image represents the structure of our Redux store, it will be simple since we are not creating some overly complex project. We'll set up Redux to manage our application's global state. Follow these steps: Create a folder at the project root. store Inside , create two folders: and . store actions states Inside , create a file. states globalStates.ts https://gist.github.com/Daltonic/157a49fef39e3a1ac8b9a8883c6213f8?embedable=true Inside , create a file. actions globalActions.ts https://gist.github.com/Daltonic/c2217eff616b28a2261888ba77c236e7?embedable=true Create a file inside the folder. globalSlices.ts store https://gist.github.com/Daltonic/69a29357cf1b9484425776a6ad4b26dd?embedable=true Create an file inside the folder. index.ts store https://gist.github.com/Daltonic/7b3a9db8902d8ce831384ad42ca7231b?embedable=true Update the file with the Redux provider. pages/_app.ts https://gist.github.com/Daltonic/ef67f453bc38c4038edc627644d25e2a?embedable=true Our application has been wrapped with Redux toolkit, and we will revisit Redux when integrating the backend with the frontend. Smart Contract Development Next, we'll develop the smart contract for our platform: Create a folder at the project root. contracts Inside , create a file and add the contract code below. contracts DappFund.sol https://gist.github.com/Daltonic/4e3f367d2b3a2227c951e74f4d58cbe8?embedable=true The contract will facilitate the creation, update, and donation to charities, as well as administrative functions like changing the charity tax and banning a charity. DappFund Here is a function-by-function breakdown: : This function sets the initial charity tax when the contract is deployed. It's executed only once during the contract's deployment. constructor() : This function allows users to create a new charity. It requires several parameters such as the name, description, image, profile, and amount of the charity. It checks that these parameters are valid and then creates a new and adds it to the mapping. createCharity() CharityStruct charities : This function allows the owner of a charity to update its details. It checks that the charity exists and that the sender is the owner of the charity before updating the charity's details. updateCharity() : This function allows the owner of a charity to mark it as deleted. It checks that the charity exists and that the sender is the owner of the charity before marking it as deleted. deleteCharity() : This function allows the contract owner to ban or unban a charity. It checks that the charity exists before toggling its banned status. toggleBan() : This function allows users to donate to a charity. It checks that the charity exists, is not banned, and has not yet reached its fundraising goal. It then increments the total donation count, creates a new , and adds it to the mapping. It also updates the raised amount and donation count of the charity. donate() SupportStruct supportersOf : This function allows the contract owner to change the charity tax. It checks that the new tax percentage is valid before updating the tax. changeTax() : This function allows anyone to get the details of a charity. It returns the associated with the given ID. getCharity() CharityStruct : This function allows anyone to get the details of all active charities. It returns an array of objects. getCharities() CharityStruct : This function allows a user to get the details of all their active charities. It returns an array of objects. getMyCharities() CharityStruct : This function allows anyone to get the details of all supporters of a specific charity. It returns an array of objects. getSupports() SupportStruct : This internal function is used to transfer funds. It sends the specified amount of Ether to the given address. payTo() : This internal function returns the current time in seconds since the Unix Epoch. It's used to timestamp donations and charity creations. currentTime() Contract Deployment and Seeding Now, let's deploy our smart contract and populate it with some dummy data: Create a folder at the project root. scripts Inside , create a and a file and add the following codes. scripts deploy.js seed.js Deploy Script https://gist.github.com/Daltonic/e4038d184c36bf69ac9b6b75da321ca1?embedable=true Seed Script https://gist.github.com/Daltonic/65ca0f2dfdf0ec91bfcf78f49654b36e?embedable=true Run the following commands to deploy the contract and seed it with data: yarn hardhat node # Run in terminal 1 
yarn hardhat run scripts/deploy.js # Run in terminal 2 
yarn hardhat run scripts/seed.js # Run in terminal 2 If you did that correctly, you should see a similar output like the one below: At this point we can start the integration of our smart contract to our frontend. https://www.youtube.com/watch?v=mVxRzkvX_w0&embedable=true Frontend Integration First, create a folder at the project root, and inside it, create a file. This file will contain functions to interact with our smart contract. services blockchain.tsx https://gist.github.com/Daltonic/449b493fe7492386f6221329f3ee918b?embedable=true The provided code is a TypeScript implementation of our blockchain service for interacting with our smart contract. This service enables users to perform actions on our charity platform, including creating and updating charities, making donations, and more. Here is a function-by-function breakdown: : This function gets the Ethereum contract instances that the service will interact with. It checks if the user has a connected Ethereum account and uses that to interact with the contract, otherwise, it uses a randomly created wallet. getEthereumContracts() : This function returns the owner of the contract. getAdmin() , , : These functions fetch all charities, the charities created by the current user, and a specific charity by its ID, respectively. getCharities() getMyCharities() getCharity() : This function fetches the supporters of a specific charity by its ID. getSupporters() , : These functions allow a user to create a new charity or update an existing charity, respectively. createCharity() updateCharity() : This function allows a user to make a donation to a specific charity. makeDonation() : This function allows the owner of a charity to delete it. deleteCharity() : This function allows the contract owner to ban a charity. banCharity() , : These are helper functions that structure the returned data from the contract into a more usable format. structuredCharities() structuredSupporters() Update the file inside to include the network using the following codes. provider.tsx services bitfinity https://gist.github.com/Daltonic/88476a8b642f0d1f879644ce7521e735?embedable=true Page Interacting with Smart Contract Next, we'll link the functions in the blockchain service to their respective interfaces in the frontend: Update to get data from the function. No 1:  Displaying all Charities pages/index.tsx getCharities() https://gist.github.com/Daltonic/c7b5205c0a352e715ea6d369c4c5a739?embedable=true Notice how Redux is used to store blockchain data before it is displayed on the screen. Update to use the hook to get the current user’s charities. No 2: Displaying User’s Charities pages/projects.tsx useEffect() https://gist.github.com/Daltonic/55de269f6d41727ad2ca283adfea241e?embedable=true Please note the use of the hook to retrieve the current user's charities and how Redux is used to handle and display data from the blockchain across multiple components. This will be a repeated pattern across the pages and components. useEffect() Update to use the function for form submission. No 3: Creating New Charities pages/donations/create.tsx createCharity() https://gist.github.com/Daltonic/58f3f813b5ee8bad45815545734c7410?embedable=true Update to use the , and functions to retrieve charity and supporters by Id. No 4: Displaying Single Charity pages/donations/[id].tsx getServerSideProps() getCharity() getSupporters() https://gist.github.com/Daltonic/96c4908e8a5406ab4e85822bb16a4b6f?embedable=true Update to use the function to retrieve charity by Id and populate the form fields. No 5: Editing Existing Charities pages/donations/edit/[id].tsx getCharity() https://gist.github.com/Daltonic/045ec20e60ba4aaac4d9ae62620bff51?embedable=true Did you see how the function was used to retrieve charity by Id and also how it was used to populate the form fields? getCharity() Components with Smart Contract Like we did with the pages above, let’s Update the following components to interact with the smart contract: Update to use the function to call the function. No 1: Handling Charity Banning components/Ban.tsx handleBanning() banCharity() https://gist.github.com/Daltonic/3890759a4c5a9d83b292c1e8cbb31d91?embedable=true Update file to use the and functions to execute a charity unlisting procedure. No 2: Handling Charity Deletion components/Delete.tsx handleDelete() deleteCharity() https://gist.github.com/Daltonic/a9dd133448062c32990435e9a762d17d?embedable=true Update file to use the function to send the payment to the smart contract using the function. No 3: Making Donations to Charities components/Donor.tsx handleSubmit() makeDonation() https://gist.github.com/Daltonic/9e82883fd17884330d2a82d5cf641eae?embedable=true Other Components Here are the rest of the components you should also update because the integration of Redux in them. Review and update the component that enables users to navigate, delete, and edit charity information. Utilize Redux to trigger the delete modal upon clicking. The NavBtn Component https://gist.github.com/Daltonic/38280dec93f6046187f4e438dbbb9007?embedable=true Review and update the implementation of Redux to trigger the donation, supporters, and ban modals upon clicking their respective buttons. The Payment Component https://gist.github.com/Daltonic/37f2724bec3380f9ff6dbf7771278541?embedable=true Review and update the implementation of Redux to close the supporters modal when the close button is clicked. The Supports Component https://gist.github.com/Daltonic/59c6788386f9e0bc28b93094da25fa14?embedable=true By implementing these updates, all components and pages are now connected to the smart contract, marking the completion of the project. If your server was down all this while, you can spin it up again by running . Nextjs yarn dev For further learning, we recommend watching the full video of this build on our . YouTube channel Conclusion In this tutorial, we've built a Decentralized Charity Platform using Next.js, Solidity, and TypeScript. We set up the development environment, built the Redux store, and deployed the smart contract to the blockchain. By integrating the smart contract with the frontend, we created a seamless user experience. Throughout the tutorial, you gained valuable skills in building Web3 applications, crafting smart contracts, and incorporating static type checking. Now, you're ready to create your own Decentralized Charity Platform. Happy coding and unleash your innovation in the world of Web3!

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How to Build a Decentralized Charity Platform with Next.js, TypeScript, and Solidity

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