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# JavaScript Code for Binary to Hexadecimal - Hexadecimal to Binary Conversion

To be honest, you don't really need JavaScript to convert a binary number to a hexadecimal number. You simply go from right to left breaking the binary number into groups of four bits, and then use a binary to hexadecimal lookup table to replace each group with its respective hexadecimal digit.

 0000 0 0001 1 0010 2 0011 3 0100 4 0101 5 0110 6 0111 7 1000 8 1001 9 1010 A 1011 B 1100 C 1101 D 1110 E 1111 F

However, if you must use JavaScript, say to create a web application, the code to convert a binary number to hexadecimal number is shown below.

```<script>

var inBin = "111001100101";
var len = inBin.length;

// determine how many bits in first nibble
var firstBits = len % 4;

// if firstBits > 0 generate padding to make even nibbles
// increase len by number of padding bits
if(firstBits > 0)
{
for(var i = 0; i < 4 - firstBits; i++)
{
len++;
}
}
else
{
}

// Binary to hexadecimal lookup table in
// a multidimensional array
var hexDigits = [
["0000","0"],
["0001","1"],
["0010","2"],
["0011","3"],
["0100","4"],
["0101","5"],
["0110","6"],
["0111","7"],
["1000","8"],
["1001","9"],
["1010","A"],
["1011","B"],
["1100","C"],
["1101","D"],
["1110","E"],
["1111","F"]];

// grab the input bits nibble by nibble
// look up in array and fetch hexadecimal value
var nibble = "";
var outHex = "";
for(var start = 0; start <= len - 4; start += 4)
{
nibble = inPadded.substring(start, start + 4);
for(var j = 0; j < hexDigits.length; j++)
{
if(nibble == hexDigits[j][0])
{
outHex += hexDigits[j][1];
}
}
}