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System design approach of a front-end web client which consumes a RESTful CRUD API back-end

When designing the front-end of a CRUD application that utilizes a RESTful backend API, my approach would involve the following steps:

1. First, I would choose a front-end framework that is well-suited for building dynamic, responsive user interfaces. In this case, I choose to use Node.js, Express.js, EJS and Axios and Bootstrap a css framework for responsive design.
2. Next, I would use EJS as the templating engine to create the layout and views of the application. EJS allows me to create reusable templates and easily integrate data from the backend API into the front-end.
3. I would use axios, a promise-based HTTP client, to make API calls to the backend, sending and receiving data in JSON format.
4. I would also handle the client-side validation and error messages to improve the user experience.
5. I would then implement the routes and controllers necessary to handle the CRUD operations on the front-end.
6. Once all the functionality has been implemented and tested, I would deploy the application to a web server for users to access.
7. I would also implement proper error handling and logging to make sure that any errors or issues are identified and resolved quickly.

Overall, I would choose to use Node.js, Express.js, EJS, Axios and Bootstrap for building the front-end of this application because they are powerful, easy-to-use technologies that are well-suited for building dynamic and responsive web applications.

High-level System Design:

1. Define the overall architecture of the system, including how the front-end and back-end will interact and communicate.
2. Identify the main components of the system, including the front-end application built with EJS and Axios, and the back-end API built with Node.js Express.
3. Incorporate Docker and Microservices in the design to containerize the application and break down the monolithic architecture.
4. Design the system to be scalable and easily extensible by keeping the front-end and back-end services separate.
5. Leverage the power of npm packages, middlewares and libraries like express-validator, cors and morgan for easier development and security.

Low-level System Design:

1. Define the specific routes and endpoints of the back-end API that the front-end application will interact with.
2. Design the front-end application layout and user interface using EJS, and implement axios to make API calls to the back-end.
3. Use Docker to containerize the application and create separate containers for the front-end and back-end services.
4. Use microservices architecture to break down the monolithic application into smaller, more manageable services.
5. Use npm packages like express-validator, cors and morgan to validate the requests and handle security issues.
6. Implement logging and monitoring system to trace the application's performance and troubleshoot issues.