Blog | Ranjan Yadav https://ranjanyadav.com.np/blog Writing about code, design, and everything in between. Install PostgreSQL 18 on Ubuntu — PGDG Repository, Security, First Steps https://ranjanyadav.com.np/blog/install-postgresql-18-ubuntu-vps A production-focused guide to installing PostgreSQL 18 on Ubuntu 24.04 using the official PGDG apt repository — covering the repo setup, post-install security, remote access, and the configuration decisions most tutorials gloss over. 2026-06-26T00:00:00.000Z Integrating ConnectIPS with Go — RSA Tokens, Validation https://ranjanyadav.com.np/blog/connectips-payment-gateway-golang A production-grade guide to wiring ConnectIPS — NCHL's account-to-account payment rail for Nepal — into a Go backend. SHA256withRSA token signing straight from a PKCS12 keystore, the redirect flow, server-to-server transaction validation, and the idempotency and amount checks most guides leave out. 2026-06-22T00:00:00.000Z Integrating ConnectIPS with NestJS — RSA Tokens, Validation https://ranjanyadav.com.np/blog/connectips-payment-gateway-nodejs A production-grade guide to wiring ConnectIPS — NCHL's account-to-account payment rail for Nepal — into a NestJS (TypeScript) backend. SHA256withRSA token signing from a PKCS12 keystore, the redirect flow, server-to-server transaction validation, and the idempotency and amount checks most guides leave out. 2026-06-21T00:00:00.000Z Integrating Fonepay with Go — QR, Web Redirect https://ranjanyadav.com.np/blog/fonepay-payment-gateway-golang A production-grade guide to wiring Fonepay — Nepal's interbank QR and payment network — into a Go backend on the standard library alone. Constant-time HMAC-SHA512 signing, dynamic QR with real-time confirmation, the web-redirect flow, and the server-side verification, idempotency, and amount checks most guides leave out. 2026-06-20T00:00:00.000Z Integrating Fonepay with NestJS — QR, Web Redirect https://ranjanyadav.com.np/blog/fonepay-payment-gateway-nodejs A production-grade guide to wiring Fonepay — Nepal's interbank QR and payment network — into a NestJS (TypeScript) backend. HMAC-SHA512 signing done right, dynamic QR with real-time WebSocket confirmation, the web-redirect flow, and the server-side verification, idempotency, and amount checks most guides leave out. 2026-06-20T00:00:00.000Z Deploy a Node.js App on an Ubuntu VPS with Nginx, PM2, and Let's Encrypt https://ranjanyadav.com.np/blog/deploy-nodejs-vps-nginx A modern step-by-step guide for deploying a Node.js application on an Ubuntu VPS using Nginx as a reverse proxy, PM2 for process management, pnpm for package management, and Let's Encrypt for free SSL. 2026-06-16T00:00:00.000Z Hello — I'm Ranjan https://ranjanyadav.com.np/blog/welcome A quick introduction to who I am, what I build, and why this blog exists. 2026-04-14T00:00:00.000Z