Building a Live Solana Devnet Explorer in 100 Lines of Vanilla JavaScript

Building a Live Solana Devnet Explorer in 100 Lines of Vanilla JavaScript No frameworks. No build tools. No wallet adapter. Just fetch() and Solana's JSON-RPC API. I added a live on-chain data section to my hackathon project's dashboard that fetches real program state from Solana devnet. Here's how it works and how you can do it too. The Problem Most hackathon dashboards are static demos. They look impressive but judges can't tell if the program actually works on-chain. I wanted my dashboard to prove it — by fetching real data from the deployed program. The Architecture Solana's devnet RPC is publicly accessible at https://api.devnet.solana.com . It accepts JSON-RPC 2.0 requests over HTTP POST. No API key required. No CORS issues from static sites. The three calls you need: getAccountInfo — read any account's data (your program, PDAs, etc.) getSignaturesForAddress — fetch recent transaction history getBalance — check SOL balance Step 1: The RPC Helper const DEVNET_RPC = ' https://api.d