MongoDB — project some fields instead of all inside $lookup

I am working with MongoDB aggregation and I need to use $lookup to lookup another collection. After the $lookup stage, I only want some fields from another collection, so I look for a solution to project inside the $lookup…

React — how to cancel previous axios request

I have to implement a search functionality and it will trigger the search api in…

How to kill the process on localhost 3000 port on window

I ran a Node.js application on localhost:3000 but it was crashed. When I tried to run it again and the old process was still there and I needed to kill it in order to run my node application.

Create pdf and upload it to AWS S3 (React, NodeJS)

Node.js — transform file buffer to array of object from html file input (json, csv)

MongoDB — aggregate array of values instead of array of objects

I am working with Mongodb aggregation and I want one field to be an array of values instead of array of objects.

"fruits" : [
    {
        "name" : "Apple"
    }, 
    {
        "name" …

React-redux — mapStateToProps didn’t trigger render

MongoDB — Losing records when unwind results of lookup operation

I am using the $lookup in the MongoDB aggregation, and I lose a lot of records after I unwind the field after the $lookup stage.

Use special character ( , and /)for api path params in NodeJS

I need to pass the path params with special character /, like ABC/20

The parameter need to be URL encoded

encodeURIComponent("ABC/20") => "ABC%2F20"