Node.js Backend Upgrade & Fixes

My site’s admin portal has stopped processing business logic after a recent host update. The full codebase is in hand, but it is running on an outdated Node.js version and now throws errors that keep the dashboard from loading... (Budget: ₹1500 - ₹12500 INR, Jobs: AngularJS, API, Backend Development, Debugging, JavaScript, Node.js, NoSQL Couch & Mongo, Performance Tuning, Version Control Git, Web Development)