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I have a separate .json file, I need to iterate over the file or read through the file and do some stuff. How exactly do I do this in Javascript?

I have a folder with an html, css, json, and js file. The js file are a list of person's and what they do. I need to analyze the json file contents using javacript. I know that in C or C++ you can open the file for reading and analyze it, then close it. So, how do I do this in Javascript? And do I need to add the name of the JSON array in the .json file, or should i leave the contents as it is?
JSON screenshot image
Nothing online have worked thus far. Hopefully Stackoverflow can help.

Let's assume you're using nodeJS, you can import the json file using require .
After you've imported the json file, you can access the object as it would be a JS object.
const jsonFile = require("./pathtofile.json")
for(let obj in jsonFile) {
console.log(obj)
}

Can javascript acess data from a csv file in the same directory and turn it into a javascript object which it can work with?

I have a html, javascript and csv file in the same directory. I would like javascript to take the data from the csv file and show it as a tabel in html. Is this possible to do? how can you use javascript to store data from a csv file into a javascript object.

Batch processing JS code on a Adobe PDF and saving result to a file or csv

What I'd like to do is run a batch process on a bunch of PDF files in a folder. This process would execute a piece of javascript who's result would then be saved in a file/csv along with all of the other responses. Is doing something like this possible?
I've researched batch processes and I know how to create one but I can't figure out how to save data into a file using Adobe JS, and then save EVERY output from EVERY pdf into the same file.

Yes. It's possible... indirectly. Acrobat won't let you just write a CSV file out to disk. However, it will allow you to create a new PDF file and add the CSV string as a file attachment to it. You can then use JavaScript to export the attachment. Part of your batch script will be to open the PDF that holds the CSV output (the "storage" file), get the current CSV attachment as a string, append your data, save it back as an attachment and close the file. You will need to "disclose" the storage file in order to manipulate it via JavaScript from another file. That's all documented in the JavaScript API.

Getting CSV Columns' name using JavaScript

I must upload large files (+1GB) in CSV format. I must check the column names, and I want to do it before upload process. So, I am trying to read the CSV using JavaScript, following
http://www.html5rocks.com/en/tutorials/file/dndfiles/
and
https://developer.mozilla.org/en-US/docs/Web/API/FileReader.readAsBinaryString
It work! But I have to read the complete file, and believe me, the files are too large.
My question is: How can I get the CSV columns' name using JavaScript, without reading the entire file?

You can access all kinds of data about a file without passing it to a FileReader. You can get the size of a file by checking file.size.
Check the documentation for File and Blob (File inherits Blob) to see what else is available to you.

How to export a .xls file from a website as a CSV file?

I am trying to export self updating .xls file from other website to mine as csv, so that I will be able to create "Live data graphs" using Highcharts JS for different parameters from this , which also update automatically according to the file.
OR
I have another method, same self updating data is on a website in form of table which gets updated with time. So , is it possilble to pull data from there for specific parameters and generate live data graphs?
Please Help.....

How about using a Google spreadsheet?
http://dataist.wordpress.com/2012/11/23/using-google-spreadsheet-as-a-database/

If I got you right, you want to convert an .xls file to .csv ?
Then you'll want to look at this article:
http://www.c-sharpcorner.com/uploadfile/yuanwang200409/how-to-convert-xls-file-into-csv-file-in-c-sharp/
As well as consider some answers on SO:
Is there any simple way to convert .xls file to .csv file? (Excel)
C# converting .xls to .csv without Excel
Personally I like the solution to extract .xls into dataset and then generate you .csv from datatble. (see c# datatable to csv)