If you have worked in building software for some years, possibly more than once the work has been either "some changes" on an existing project or a completely new greenfield project. Already working a.k.a brownfield products have users using it whereas new projects don't have the volume of users till it goes fully on production in some way. In this post, we will evaluate the differences in the mindset software engineers need to have for a stable software product vs a new greenfield project. Let's get started!

There are multiple ways to read a file line by line with Node.js. In Node.js files can be read in sync way or in an async way. With the async path, it is possible to read large files without loading all the content of the file into memory.

Reading the whole file at once will make the process memory intensive. With the ability to load and read a file line by line it enables us to stop the process at any step as per need. In this post, we will look into 3 ways to read a file line by line using Node.js with memory usage comparison.