How to organize data upload on Node.js?

Question

MongoDB

There is an API on Express.js (database on MongoDB) and a client - CMS on Angular.js. It is necessary to organize on the client the unloading of data from one of the collections (about 100k records) with saving to a CSV file. How best to implement this?

Answer 1

We read from mongi with a stream (like this: MyCollection.find({}).sort({}).stream()), then after simple transformations, we either write to a file (also with a stream) and then give it to nginx, or immediately give it to the browser. The first option is good because the result can be cached, and nginx is still more efficient than the node in such things, the second is stupidly simpler.
PS in principle, it is possible without streams - if there is a lot of memory on the server :)

Answer 2

With mongoexport you can export to csv
i.e. start the process, and send the resulting file.