GGMU GGMU - 6 months ago 21
Javascript Question

convert CSV lines into Javascript objects

I have a simple csv file

people.csv:

fname, lname, uid, phone, address
John, Doe, 1, 444-555-6666, 34 dead rd
Jane, Doe, 2, 555-444-7777, 24 dead rd
Jimmy, James, 3, 111-222-3333, 60 alive way


What I want to do it get each line of the CSV, convert it to a JavaScript object, store them into an array, and then convert the array into a JSON object.

server.js:

var http = require('http');
var url = require('url');
var fs = require('fs');

var args = process.argv;
var type = args[2] || 'text';
var arr = [];
var bufferString;

function csvHandler(req, res){
fs.readFile('people.csv',function (err,data) {

if (err) {
return console.log(err);
}

//Convert and store csv information into a buffer.
bufferString = data.toString();

//Store information for each individual person in an array index. Split it by every newline in the csv file.
arr = bufferString.split('\n');
console.log(arr);

for (i = 0; i < arr.length; i++) {
JSON.stringify(arr[i]);
}

JSON.parse(arr);
res.send(arr);
});
}

//More code ommitted


My question is if I am actually converting that CSV lines into Javascript objects when I call the .split('\n') method on bufferString or is there another way of doing so?

Answer

By doing this:

arr = bufferString.split('\n'); 

you will have an array containing all rows as string

["fname, lname, uid, phone, address","John, Doe, 1, 444-555-6666, 34 dead rd",...]

You have to break it again by comma using .split(','), then separate the headers and push it into an Javascript Object:

var jsonObj = [];
var headers = arr[0].split(',');
for(var i = 1; i < arr.length; i++) {
  var data = arr[i].split(',');
  var obj = {};
  for(var j = 0; j < data.length; j++) {
     obj[headers[j].trim()] = data[j].trim();
  }
  jsonObj.push(obj);
}
JSON.stringify(jsonObj);

Then you will have an object like this:

[{"fname":"John",
  "lname":"Doe",
  "uid":"1",
  "phone":"444-555-6666",
  "address":"34 dead rd"
 }, ... }]

See this FIDDLE