Have you implemented all your projects using Node.js?

No, not all projects are implemented using Node.js. Node.js is a JavaScript runtime environment on the server, and it is well-suited for certain tasks, such as creating web servers, APIs, real-time applications.

However, the choice of technology depends on the project requirements, the team, and other factors. In some cases, other platforms and languages may be used, such as Java, Python, Go, Ruby, etc.

Speaking from my experience, I have used Node.js for projects that required high performance in handling a large number of concurrent connections, as well as for rapid prototyping. But I have also worked with other technologies depending on the task.