Dockerization of node js application

I am new to docker.

I have node js application working with no-sql db. My application has several atomic APIs (written in node js) which contains the business logic which does UI or DB work. These APIs can be packaged to form different re-usable blocks. It is envisioned to have several concurrent users, I need to make a strategy in docker. How should best should I proceed,

a. Do we need to create images of all APIs/Packages in docker (APIs will be 1000) b.Should i keep few node images with entire application.

Please help me out.

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