Function takes a CSV (header + data) string as input and gives back a JS object.

csv2js.js

// Start from https://gist.github.com/iwek/7154578#file-csv-to-json-js
// and fix the issue with double quoted values

function csvTojs(csv) {
  var lines=csv.split("\n");
  var result = [];
  var headers = lines[0].split(",");

  for(var i=1; i<lines.length; i++) {
    var obj = {};

    var row = lines[i],
      queryIdx = 0,
      startValueIdx = 0,
      idx = 0;

    if (row.trim() === '') { continue; }

    while (idx < row.length) {
      /* if we meet a double quote we skip until the next one */
      var c = row[idx];

      if (c === '"') {
        do { c = row[++idx]; } while (c !== '"' && idx < row.length - 1);
      }

      if (c === ',' || /* handle end of line with no comma */ idx === row.length - 1) {
        /* we've got a value */
        var value = row.substr(startValueIdx, idx - startValueIdx).trim();

        /* skip first double quote */
        if (value[0] === '"') { value = value.substr(1); }
        /* skip last comma */
        if (value[value.length - 1] === ',') { value = value.substr(0, value.length - 1); }
        /* skip last double quote */
        if (value[value.length - 1] === '"') { value = value.substr(0, value.length - 1); }

        var key = headers[queryIdx++];
        obj[key] = value;
        startValueIdx = idx + 1;
      }

      ++idx;
    }

    result.push(obj);
  }
  return result;
}

what if the csv file is more than 1 GB

You can use a dedicated Web Worker for that operation: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers

have bugs, and return [{"Header Name" :value, Header1 Name : value, ..]

There is a bug:
var value = row.substr(startValueIdx, idx - startValueIdx).trim();
In the condition 'idx === row.length - 1', value lost a character.

I fix this bug:
if (c === ',' || /* handle end of line with no comma / idx === row.length - 1) {
let length = idx - startValueIdx;
if(idx === row.length -1) {
length++;
}
/ we've got a value */
var value = row.substr(startValueIdx, length).trim();

function csvTojs(csv) {
how to pass csv object to function?

Hello,
It's not working for me.
@hoist1999 could you provide the full code to fix it ?

Tks