NodeJS parseInt() function does not return correct HEX value

Question

I have the following code to convert a binary to a hex in NodeJS:

const bin = "1011100100001011101010100011100100001001101000100011101110110101101111011000001111111100010010111110001110101011100111101101110101100110110111000001111010101010110001110001110000110101001111111101000100110011111000010111110011001011000000001001010000100100"
const hex = parseInt(bin, 2).toString(16).toUpperCase();
console.log(hex)

and it only return:

B90BAA3909A23800000000000000000000000000000000000000000000000000

Im not sure, but this could be possible a "out of range" error. I think the number/input that parseInt returns is to big/long.With a smaler input, it works. — Marc
– Marc, Commented Jul 31, 2021 at 13:12
I looked a the source from "rapidtables.com/convert/number/binary-to-hex.html" they use the "BigNumber" pacakge on npm. console.log((new BigNumber(bin, 2)).toString(16).toUpperCase()) Perhaps this works without "BigNumber" and instead of use developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Marc
– Marc, Commented Jul 31, 2021 at 13:34

vsemozhebuty · Accepted Answer · 2021-07-31 15:08:19Z

1

As maximum safe integer in JavaScript is just 2^53 - 1 or 0b11111111111111111111111111111111111111111111111111111 (see Number.MAX_SAFE_INTEGER), you need BigInt here:

const bigIntFromBin = BigInt("0b1011100100001011101010100011100100001001101000100011101110110101101111011000001111111100010010111110001110101011100111101101110101100110110111000001111010101010110001110001110000110101001111111101000100110011111000010111110011001011000000001001010000100100");
const bigIntHex = bigIntFromBin.toString(16).toUpperCase();
console.log(bigIntHex);

answered Jul 31, 2021 at 15:08

vsemozhebuty

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