Backend environment - Indian Market Trading Platform

Configuration file: nifty_fifty_bank_nifty_NodeJS/.env Load order: dotenv.config() in src/env.ts and scripts.

Core server

Variable	Example	Purpose
`PORT`	`3005`	HTTP + Socket.IO port
`MONGO_URI`	`mongodb://127.0.0.1:27017/Nifty50`	MongoDB connection
`SECRET_KEY`	(secret)	JWT signing
`TOKEN_EXPIRATION`	`12h`	JWT lifetime
`FRONTEND_URL`	`http://localhost:3000`	CORS origin
`DATA_PROVIDER`	`zerodha`	Market data backend

Auth / admin bootstrap

Variable	Purpose
`salt`	Bcrypt salt reference
`ADMIN_EMAIL`	Default admin email for `createAdminUser` script
`ADMIN_PASSWORD`	Default admin password for script

Market hours (IST)

Variable	Purpose
`TIMEZONE`	`Asia/Kolkata`
`START_HOUR`, `START_MINUTE`	Cash session open
`END_HOUR`, `END_MINUTE`	Cash session close
`NFO_*`	NFO extended close
`MCX_`, `CDS_`	Commodity/currency hours

TrueData (optional / legacy)

Variable	Purpose
`TRUE_DATA_USER`, `TRUE_DATA_PASSWORD`	Feed credentials
`TRUE_DATA_PORT`	`8084` live, `8082` replay
`TRUE_DATA_REPLAY`	`0` live, `1` replay
`TRUE_DATA_URL`	`push` or `replay`

Zerodha

Variable	Purpose
`ZERODHA_API_KEY`	Kite app key
`ZERODHA_API_SECRET`	Kite app secret
`ZERODHA_USER_ID`	Login id (auto-login)
`ZERODHA_PASSWORD`	Password (auto-login)
`ZERODHA_TOTP_SECRET`	Base32 TOTP secret

Never commit real .env files to git. Use placeholders in documentation and store secrets in a secure vault for production.

SMTP (optional)

SMTP_HOST, SMTP_PORT, SMTP_USER, SMTP_PASSWORD, SMTP_FROM for email features.

Frontend pairing

Ensure:

PORT === VITE_APP_SOCKET_URL port
http://localhost:{PORT}/api/ === VITE_APP_BASEURL