CSV to JSON conversion using Bash

Sample Input:
========
h1,h2,h3,h4,h5,h6
1,2,3,4,5,6
11,12,13,14,15,16
21,22,23,24,25,26

Sample Output:
=========
{
{h1:1,h2:2,h3:3,h4:4,h5:5,h6:6},
{h1:11,h2:12,h3:13,h4:14,h5:15,h6:16},
{h1:21,h2:22,h3:23,h4:24,h5:25,h6:26}
}

Code:
===
Code courtesy: Thanks to EnDeR for the code
Scripting languages used: bash, awk

#!/bin/bash


###Read first line to get headings
read first_line < sampleInput.csv


#################Start reading headings into array##############################
a=0

###Read number of headings in line by getting number of field separators(which here is ,)###
headings=`echo $first_line | awk -F, {'print NF'}`

###Read number of lines by wc -l###
lines=`cat test.csv | wc -l`

while [ $a -lt $headings ]
do
#Read ($a + 1) value into x as awk prints columns in 1-n order
#Read each column element into headings array
head_array[$a]=$(echo $first_line | awk -v x=$(($a + 1)) -F"," '{print $x}')
a=$(($a+1))
done
####################End reading headings into array##############################


c=0
echo "{"
while [ $c -lt $lines ] #Loop on number of lines
do
read each_line
if [ $c -ne 0 ] #$c = 0 is the headings line.skip it
then
d=0
echo -n "{"
while [ $d -lt $headings ] #Loop on number of headings
do

#Same logic as reading each heading.Read each element to print it with its heading
each_element=$(echo $each_line | awk -v y=$(($d + 1)) -F"," '{print $y}')

if [ $d -ne $(($headings-1)) ] #print comma only if its not the last element
then
echo -n ${head_array[$d]}":"$each_element","
else
echo -n ${head_array[$d]}":"$each_element
fi
d=$(($d+1))
done
if [ $c -eq $(($lines-1)) ] #skip , for the last block
then
echo "}" 
else
echo "},"
fi
fi
c=$(($c+1))
done < test.csv
echo "}"