🧠 1. System Architecture (Recommended) Frontend (UI Dashboard) React (best for real-time dashboards) Tailwind CSS (fast styling) WebSocket for live updates Backend (Core Engine) Node.js (Express) OR Python (FastAPI) Handles: API calls to brokers Data aggregation WebSocket server Data Sources Broker APIs: Shoonya API Angel One SmartAPI Optional: NSE unofficial APIs (for fallback) Realtime Flow Broker API → Backend → WebSocket → Frontend Dashboard 🧱 2. Project Structure option-dashboard/ │ ├── backend/ │ ├── server.js │ ├── routes/ │ │ └── optionChain.js │ ├── services/ │ │ ├── shoonya.js │ │ └── angel.js │ └── websocket.js │ ├── frontend/ │ ├── src/ │ │ ├── components/ │ │ │ ├── OptionChain.jsx │ │ │ ├── Dashboard.jsx │ │ │ └── SymbolSwitcher.jsx │ │ ├── App.jsx │ │ └── api.js │ └── README.md ⚙️ 3. Backend (Node.js Example) Install npm init -y npm install express axios ws cors 📡 server.js const express = require("express"); const cors = require("cors"); const { startWebSocket } = require("./websocket"); const app = express(); app.use(cors()); app.use(express.json()); app.get("/api/option-chain", async (req, res) => { const symbol = req.query.symbol || "NIFTY"; // mock for now (replace with broker API) const data = await getOptionChain(symbol); res.json(data); }); async function getOptionChain(symbol) { // Replace with Shoonya / Angel API return { symbol, strikePrices: [22000, 22100, 22200], CE: [100, 80, 60], PE: [90, 110, 130], }; } app.listen(5000, () => console.log("Server running")); startWebSocket(); 🔌 websocket.js (Live Updates) const WebSocket = require("ws"); function startWebSocket() { const wss = new WebSocket.Server({ port: 5001 }); wss.on("connection", (ws) => { console.log("Client connected"); setInterval(() => { ws.send(JSON.stringify({ nifty: Math.random() * 100 + 22000, banknifty: Math.random() * 200 + 48000 })); }, 1000); }); } module.exports = { startWebSocket }; 🎨 4. Frontend (React) Install npx create-react-app frontend npm install axios 📊 Dashboard.jsx import React, { useEffect, useState } from "react"; export default function Dashboard() { const [data, setData] = useState({}); useEffect(() => { const ws = new WebSocket("ws://localhost:5001"); ws.onmessage = (event) => { setData(JSON.parse(event.data)); }; }, []); return (

NIFTY: {data.nifty}

BANKNIFTY: {data.banknifty}

); } 🔘 SymbolSwitcher.jsx (1-click buttons) export default function SymbolSwitcher({ setSymbol }) { return (

); } 📈 OptionChain.jsx import axios from "axios"; import { useEffect, useState } from "react"; export default function OptionChain({ symbol }) { const [data, setData] = useState([]); useEffect(() => { axios.get(`http://localhost:5000/api/option-chain?symbol=${symbol}`) .then(res => setData(res.data)); }, [symbol]); return ( {data.strikePrices?.map((strike, i) => ( ))}

Strike	CE	PE
{strike}	{data.CE[i]}	{data.PE[i]}

); } 🔐 5. Broker Login Integration ⚠️ Important Reality: You CANNOT directly embed login pages of Shoonya / Angel inside your app (security restrictions). ✅ Correct Way (OAuth / API login) Shoonya / Angel Flow: Redirect user to broker login page User logs in Broker returns: request_token / access_token Store token in backend Use token for API trading Example Redirect app.get("/login/angel", (req, res) => { const url = "https://smartapi.angelbroking.com/publisher-login"; res.redirect(url); }); 🔁 6. Alternative (Better Way) Instead of redirect: 👉 Use API key + session generation Example flow: User enters API key → Backend generates session → Token stored ⚡ 7. Advanced Features You Can Add 🔥 Must-have Open Interest (OI) change PCR (Put Call Ratio) IV (Implied Volatility) ATM auto-detection Greeks (Delta, Theta) 📊 UI Enhancements Heatmap (like Sensibull) Strike highlighting Auto refresh toggle 🤖 Algo Features Strategy builder Auto order execution Alerts (Telegram API) 🚀 8. Tech Stack Summary Layer Tech Frontend React + Tailwind Backend Node.js / FastAPI Realtime WebSocket Broker Shoonya / Angel API DB MongoDB / Redis ⚠️ 9. Key Challenges Broker API rate limits WebSocket stability NSE data reliability Authentication handling

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