You can use the following methods to scale your Node JS application
1. Decomposing (AKA 'microservicing'): Involves juggling with multiple microservices
2. Splitting (Sharding/Horizontal Partitioning): Involves splitting your app into multiple instances, each one responsible for a single, specific part of your app�s data
3. Cloning: Clone your Node.js back-end application, multiple times, and assign a specific part of the workload to each cloned instance