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· 15 min read
Phil Leggetter

The MERN Stack - a web technology stack consisting of MongoDB, Express.js, React, and Node.js - was introduced around 2018 as a popular set of technologies to enable end-to-end development in JavaScript. Although the popularity of fullstack frameworks such as Next.js means that MERN isn't as popular as it once was, it is still a viable and productive choice with its decoupled architecture providing more flexibility than you'll get with a fullstack framework.

Today, I'd like to introduce the TERN (Tigris, Express.js, React, and Node.js) stack which replaces MongoDB with Tigris.

Migrating from MERN to TERN

In this post, you'll learn about MERN and TERN and why you should migrate from MERN to TERN. We'll cover all the steps involved in migrating a MERN application to TERN (Tigris, Express.js, React, and Node.js); first using Tigris MongoDB compatibility to get your existing application working with Tigris instead of MongoDB without any code changes (⚠️ spoiler: it's as simple as updating the MongoDB connection string). Then, we'll make a few changes to get the application using the Tigris SDK instead of the MongoDB Node.js driver, completing the migration.