Node.js is a good choice for building real-time web applications, such as chat applications, online games, and streaming platforms. It is also well-suited for building server-side applications and APIs (Application Programming Interfaces).

The time it takes to build a Node.js application can vary significantly depending on the complexity of the project. Factors that can impact the timeline include the size and scope of the project, the number of features and modules that need to be implemented, and the number of developers working on the project. In general, larger and more complex projects will take longer to develop than smaller, simpler ones.

The cost of building a Node.js application can vary based on the complexity of the project and the hourly rate of the development team. In general, you can expect to pay more for a larger, more complex project than you would for a smaller, simpler one. It’s also worth noting that the cost of development can vary based on the location of the development team and the specific skills and experience of the developers.