Free online courseREST API

Course Description

Strong REST APIs are the backbone of modern web and mobile products. This free online course helps you build the skills to design and implement a RESTful service from the ground up using Node.js, with an approach that stays practical and focused on how real backend systems behave in production. You will move from understanding what a RESTful API is and why it exists to creating endpoints that feel consistent, predictable, and easy for other developers to consume.

As you progress, you will get comfortable structuring an API with Express, expanding it with clean routing, and handling common pitfalls such as invalid input, unexpected failures, and response patterns that can break client applications. You will also learn how to work efficiently during development by using tools that improve your feedback loop, and how to correctly parse and validate request bodies so your API behaves reliably across different clients.

Data persistence is a key step in any backend workflow, and you will connect your API to MongoDB with Mongoose, creating schemas that reflect real application needs. You will practice applying validation rules, modeling relationships, and managing scenarios like orders tied to products. You will also work with richer queries, including populating related data to return useful, readable responses that reduce the amount of client-side stitching.

To make the API suitable for real applications, you will add features that go beyond basic CRUD. You will handle image uploads, learn how multipart form data differs from JSON requests, and implement authentication flows such as signup and login. The course clarifies the difference between sessions and tokens, then guides you through using JWTs for protecting routes so only authorized users can access sensitive operations.

By the end, you will have a clearer understanding of how to plan a backend service, organize logic with controllers, and make design choices that lead to maintainable code. Whether you are aiming for a backend development role, building your own app, or strengthening your full-stack profile, this course provides a hands-on path to creating REST APIs that are secure, structured, and ready to integrate with real frontends.