how to convert hexadecimal value expected output using JavaScript

Question

I tried a lot of ways, but none give the expected result.

Input: 04:3d:54:a2:68:61:80

Expected output: 01193333618139520

How would I go about this in JS?

const value = `04:3d:54:a2:68:61:80`
const barcode = parseInt(value.replace(':', ''), 16)
console.log(barcode) // 1085

please make an attempt and share minimal reproducible example before asking for help. — depperm
– depperm, Commented Jan 13, 2023 at 15:07
how-do-i-replace-all-occurrences-of-a-string-in-javascript, also someone has to mention, that you are barely below Number.MAX_SAFE_INTEGER, at 51 bits. If your input would start with 2 instead of 0, that would already cause issues. — ASDFGerte
– ASDFGerte, Commented Jan 13, 2023 at 15:36

Yedidya Rashi · Accepted Answer · 2023-01-13 15:33:06Z

3

The problem is that you are using replace instead of replaceAll

const value = `04:3d:54:a2:68:61:80`
const barcode = parseInt(value.replaceAll(':', ''), 16)
console.log(barcode)

As Lian suggests, you can also achieve that with replace(/:/g, '')

And therefore get better browser compatibility

const value = `04:3d:54:a2:68:61:80`
const barcode = parseInt(value.replace(/:/g, ''), 16)
console.log(barcode)

edited Jan 13, 2023 at 15:33

answered Jan 13, 2023 at 15:16

Yedidya Rashi

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1 Comment

Lain Over a year ago

For completeness and legacy sake: .replace(/:/g, '')

korlend · Accepted Answer · 2023-01-13 15:13:56Z

1

First remove colons, then use parseInt(myHex, 16).

const myHex = '04:3d:54:a2:68:61:80';

function hexToDecimal(hexadecimal) {
  return parseInt(hexadecimal.replaceAll(':', ''), 16);
}

console.log(hexToDecimal(myHex));

answered Jan 13, 2023 at 15:13

korlend

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Comments

SeaJay76 · Accepted Answer · 2023-01-13 15:25:23Z

-1

Use the parseInt function, passing your input as the first parameter and 16 (since hexadecimal is base-16) as the second.

let input = '04:3d:54:a2:68:61:80';
const inputParsed = parseInt(input.replace(/:/g, ''), 16); // 1193333618139520

If you need the leading zero for some reason you can do something like this:

const inputParsedStr = `${inputParsed.toString().startsWith('0') ? '' : '0'}${inputParsed}`; // '01193333618139520'

answered Jan 13, 2023 at 15:25

SeaJay76

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