How to convert ETH ethereum transaction value to decimal in javascript

Question

Example value: 0x2c1c986f1c48000

from: here

Expected value back: 0.19866144 Eth

score 2 · Answer 1 · answered Dec 28 '21 at 04:20

2

ethers.utils.formatEther('1000000000000000000') // return 1.0

answered Dec 28 '21 at 04:20

Kyeson

121
4

score 1 · Accepted Answer · answered Oct 19 '17 at 19:57

1

Ether fixed point numbers are higher precision than javascript floats, so you will need to use a library that supports those bigger values.

In Web3 you can simply do:

let bigNumber = web3.toBigNumber('0xFFFFFF')
web3.fromWei(bigNumber)

answered Oct 19 '17 at 19:57

OneChillDude

342
1
12

I come up with: parseInt(0x2c1c986f1c48000, 16) / Math.pow(10, 18) link – Sunny Oct 20 '17 at 06:48

score 1 · Answer 3 · edited Oct 20 '17 at 12:46

You can use the BigNumber library:

var value_wei = "0x2c1c986f1c48000";
var value_ether = new BigNumber(value_wei).dividedBy(new BigNumber("1000000000000000000");

To explain: Ethereum works with units of wei. 1 ether is 1e18 wei, so you have to deal numbers that are too large to be handled by javascript. The BigNumber library accepts representation of numbers a strings, so you can go around this problem.

Note that all functions in web3.js always return values in wei as a BigNumber object, so the return of web3.eth.getBalance(...) can be directly used with the lines above, for example.

How to convert ETH ethereum transaction value to decimal in javascript

3 Answers3