Decentralized News Service Tutorial

Building a decentralized news service with Chainlink Functions and Hacker News API

(Block Magic Hackathon Session)

Instructor

Richard Gottleber - @thergdev

YouTube

https://www.youtube.com/watch?v=8iLuNx9jYSo

Written Tutorial: "Blockchain Masterclass for JavaScript Developers"

https://cll-devrel.gitbook.io/javascript-for-blockchain-master-class/decentralized-news-service-contract

JavaScript code in Functions Playground

https://functions.chain.link/playground/b44eba0d-4498-48c5-a675-81780fc6873e

Smart Contract

Solidity code

functions.sol

Contract Address

0xb835b0F63F411482B4EA0cfbD47Fe6BD6949AD70

Chainlink Functions Subscription

https://functions.chain.link/sepolia/2489

How to run the frontend?

0. Prerequisite: Have the smart contract deployed and run sendRequest a few times
1. Clone the repository
2. Run npm install within the frontend folder
3. Create a .env file in the project root folder with the following content:

# RPC for sepolia (Change this if you want to use a different chain)
PROVIDER_URL="https://rpc.sepolia.org"

# CHANGE THIS TO YOUR CONTRACT ADDRESS!
CONTRACT_ADDRESS="0xb835b0F63F411482B4EA0cfbD47Fe6BD6949AD70"

4. Run npm run dev in the terminal from the frontend folder
5. Open page at http://localhost:4321 or with the given port if you changed it