# What is Database in Node.js? Beginner's Guide (2026)

Meta Description: Learn what a database is in Node.js, explore MySQL, PostgreSQL, MongoDB, and SQLite options, and build your first database connection with real code examples. (158 chars) You've built your first Node.js API. It works — but every time the server restarts, your data vanishes. That's the moment every developer realizes they need a database. Let's fix that, step by step. What is a Database? A database is an organized system for storing, retrieving, and managing data persistently. Think of it as a supercharged spreadsheet your application can read and write to — even after restarting. There are two major families: SQL (Relational): Data lives in tables with rows and columns. Strict schema. Examples: MySQL, PostgreSQL, SQLite. NoSQL (Non-relational): Flexible structure — documents, key-value pairs, or graphs. Examples: MongoDB, Redis. Quick rule of thumb: Structured, relational data (users, orders) → SQL Flexible, nested data (posts, logs, real-time feeds) → NoSQL Why Node.