Since the folder/file data structure is the same as before, nothing changes for passing the models as context to the Express routes.In this tutorial we’ll create a REST API using Node.js and Express. Now we are using the Mongoose models that connect us to the MongoDB database. Previously, these models have been sample data. In our src/index.js where we set up and start the Express application with the MongoDB database, we already have a Express middleware in place which passes the models as context to all of our Express routes. That's why we need to wire our Express routes to MongoDB via Mongoose to marry both worlds. Now we want to make sure that every CRUD operation going through this REST API reads or writes from/to the MongoDB database rather than using sample data as we did before for our Express routes.

Previously we have set up MongoDB in our Express.js application and seeded the database with initial data, but didn't use it in Express for the RESTful API yet. This section focuses first on connecting MongoDB to Express for our REST API. Everything that would be missing is the frontend application with React, Angular, Vue or something else. It's perfect for establishing a MERN (MongoDB, Express, React, Node), MEAN (MongoDB, Express, Angular, Node), or MEVN (MongoDB, Express, Vue, Node) tech stack. It gives you everything to expose an API (Express routes), to add business logic (Express middleware and logic within Express routes), and to use real data with a database (MongoDB). Node + Express + MongoDB is a powerful tech stack for backend applications to offer CRUD operations. Part 4: Setup MongoDB with Mongoose in Express.Part 3: How to create a REST API with Express.js in Node.js.Part 2: How to setup Express.js in Node.js.

Part 1: The minimal Node.js with Babel Setup.This tutorial is part 5 of 5 in this series.

Express mongodb