This tutorial provides a comprehensive guide for developing a CRUD RESTful API using Node.js, Express, and PostgreSQL, detailing each step from setting up the environment to implementing CRUD operations. The process begins with installing PostgreSQL and creating a database, followed by setting up a Node.js application and Express server. The tutorial explains how to use the node-postgres module to interface with the PostgreSQL database and outlines the creation of routes and functions to handle GET, POST, PUT, and DELETE HTTP requests. It also addresses common API development issues such as CORS and middleware order and offers solutions for securing the API through authentication, authorization, input validation, and the use of Helmet middleware. Additionally, the tutorial suggests further enhancements, including integrating with frontend frameworks, containerizing the API, implementing tests, and setting up CI/CD pipelines, to expand upon the basic API functionality established.