Summary

As a summary, we have explained how various features in LoopBack core modules can be useful for our developers to build a scalable Node.js application.

• Inversion of Control and Dependency Injection serves as the foundation to manage artifacts within a Node.js application which keeps the construction of dependencies of a class separated from its behaviors.
• Extension points and extension framework help you to organize artifacts with loose coupling and promote extensibility.
• Observers and interceptors allows you to add logic as part of the application life cycle events.
• Configuration can be added to extension points, extensions and services which enables greater flexibility in your application.
• Boot by convention allows artifacts automatically discovered and loaded.

In addition, LoopBack can also be used as the framework to create microservices. The Twelve-Factor App methodology promotes some key architectural principles for building software-as-a-service applications. This section shows how the criteria of Twelve-Factor are satisfied by Node.js application powered by LoopBack.

• Codebase: LoopBack application code can be committed to GitHub for the version control.

• Dependencies: Dependency injection can be used to keep the construction of dependencies of a class or function separated from its behavior.

• Config: LoopBack provides context-based configuration and pluggable configuration resolver.

• Backing services: The concepts of services and datasources in LoopBack are the backing services for an application.

• Build, release, run: LoopBack applications which are scaffolded by the CLI contains npm scripts to build and run the applications.

• Processes: A LoopBack application can be deployed and run in a stateless Docker container. A Dockerfile is generated by default when scaffolding a LoopBack application.

• Port binding: Export services via port binding is possible through the HTTP/HTTPS server within a LoopBack application with additional configurations.

• Disposability: There are life cycle event observers and interceptors that you can add logic to maximize robustness.

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