CODEWITHSUNDEEP
javascriptnode.jsfloating-pointtype-conversionhex
Jay Bhatt
Jay Bhatt

Reputation: 41

How to convert 4 byte Hex to floating-point number in Node.js

I have four bytes of Hex data, I am trying to convert it to floating-point number in Node.js.

i.e.

0x58 0x86 0x6B 0x42 --> 58.8812
0x76 0xD6 0xE3 0x42 --> 113.9189
0x91 0x2A 0xB4 0x41 --> 22.52078

I have tried to convert from different functions found on the internet, But unfortunately not getting the desired outcome. On https://www.scadacore.com/tools/programming-calculators/online-hex-converter/ link I am getting proper value in "Float - Little Endian (DCBA)" cell by entering Hex string, But do not know how to do it in node js. I think maybe I am searching the wrong thing or I have understood it wrong.

Thank You.

Upvotes: 2

Views: 1429

Answers (1)

Befeepilf
Befeepilf

Reputation: 647

Given that you have a string representation of your hex data (e.g. '58866B42' regarding your first example) do the following to convert it to a floating point number:

let myNumber = Buffer.from(hexString, 'hex').readFloatLE()

The LE in readFloatLE stands for Little Endian.

Upvotes: 1

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