csv2json | gem useful for converting CSV files | JSON Processing library

I am a newbie to json and I tried what has been proposed here. But I failed.

My original file (abbreviated) is called test.csv and looks like this:

The first API request successfully send a response. However, when I do another GET request the error "write after end" is given.

When I turn off .pipe(addThing) then it does work on consecutive calls.

Is the through2-map function ending the connection or response somehow?

I learned how to write JSON object from local csv file. However, I am designing a simple check-in web application with javascript and I want to update json file locally. I asked SO community how to update json object in javascript and people suggests using NodeJS express framework which is totally new and complicated to me. I am thinking what if I can simply update json object locally, and want to learn efficient javascript solution on this task.

Basically I have local mother json file use it as simple database to check the record, and I have source csv file that can be written as new json object, so my program want to compare the record in new json object from mother json file.

here is what I tried:

in this script, I am able to write and print out JSON object on the console from local csv file, and I am able to check whether manually entered record are in json object or not.

Unsure on this one - any help hugely appreciated!

Using ideally just an online converter, or if not perhaps a node package, I'm trying to convert a CSV file like this:

I am trying to create a dataframe from RDD in order to be able to write to a json with following format A sample json is as shown below(expected output)

"1234":[ { loc:'abc', cost1:1.234, cost2:2.3445 }, { loc:'www', cost1:1.534, cost2:6.3445 } ]

I am able to generate the json with cost1 and cost2 in String format. But I want cost1 and cost2 to be double. I am getting error while creating data frame from rdd using schema defined. Somehow the data is being considered as String instead of double. Can someone help me to get this right? Below is my scala code of my sample implementation

My algorithm for converting CSV to JSON data works but when I click "Download JSON" it gives me a CSV file. Does anyone know what the issue is?

Also, the "convert to CSV" button is not outputting anything!

You don't need to pay attention to the Highcharts code even though I included it.

Does anyone know how to fix this? The code is here (some of the code belongs to Sturtevant from JSFiddle. Credits to him):

I have a CSV that looks like this (below is the header column and one sample row).

I have this code which just reads in data from a .csv file and converts it to json and logs the data: