data-splitter.js

let fund = require("./data/dreaminvest-data-fund.json");
let plan = require("./data/dreaminvest-data-plan.json");

let records = fund.records;
let i,j,temparray = [],chunk = 200;
let fname = `data/dreaminvest-data-fund${i}d.json`;

let writeFile = function(name, contents) {
    var fs = require('fs');
    fs.writeFile(name, contents, function(err) {
        if(err) {
            return console.log(err);
        }
        console.log("The file was saved!");
    }); 
}

let writeDataFile = function(recordData) {
    writeFile("data/" + recordData.fileName, JSON.stringify(recordData.data));
    temparray.push(recordData.fileName);
}

for (i=0,j=records.length; i<j; i+=chunk) {
    writeDataFile(
        { "data": 
            { "records":records.slice(i,i+chunk)  }, 
        "fileName": `dreaminvest-data-fund${i}.json` 
        }
    );
}

plan[1].files = temparray;
writeFile("data/dreaminvest-data-plan.json", JSON.stringify(plan));