Javascript: Convert a hexadecimal encoded String to a hexadecimal byte

Question

Now I have to convert the hexadecimal encoded in a String to a byte hexadecimal.

var str = "5e" 

var b = // Should be 0x5e then.

if str = "6b", then b = 0x6b and so on.

Is there any function in javascript, like in java

Byte.parseByte(str, 16)

Thanks in advance

You can use Int8Array (signed) or Uint8Array (unsigned) types with the native function parseInt(hexString, 16) — rm4
– rm4, Commented Aug 20, 2016 at 6:19

hugomg · Accepted Answer · 2016-08-20 07:07:02Z

1

The function you want is parseInt

parseInt("6b", 16) // returns 107

The first argument to parseInt is a string representation of the number and the second argument is the base. Use 10 for decimal and 16 for hexadecimal.

edited Aug 20, 2016 at 7:07

user663031

answered Aug 20, 2016 at 6:17

hugomg

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5 Comments

user3898336 Over a year ago

No, it gives the value 107

hugomg Over a year ago

0x6b is just another way to write 107

rm4 Over a year ago

Use Int8Array or Uint8Array to store as byte.

user3898336 Over a year ago

The problem is that I expect an output of 0x6b which can be used to pass as a buffer.

hugomg Over a year ago

I don't understand. In Javascript (and most other programming languages), 0x6b is just another way to write 107. They are the same thing.

Zack · Accepted Answer · 2016-08-20 07:14:00Z

1

From your comment, if you expect "an output of 0x6b" from the string "6b" then just prepend "0x" to your string, and further manipulate as you need. There is no Javascript type that will output a hexadecimal in a readable format that you'll see prefixed with '0x' other than a string.

answered Aug 20, 2016 at 7:14

Zack

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Comments

user3898336 · Accepted Answer · 2017-07-21 08:06:32Z

1

I solved it by using just

new Buffer("32476832", 'hex')

this solved my problem and gave me the desired buffer

<Buffer 32 47 68 32>

answered Jul 21, 2017 at 8:06

user3898336

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