[Ethereum] BigNumber string error when passed as uint256

soliditytruffleweb3js

I get the following error when passing (new BigNumber('2')).exponentiatedBy(100) big number value as uint256

Error: invalid BigNumber string value (arg="value", value="1.267650600228229401496703205376e+30", version=4.0.28)

I am using Truffle, but seems like a web3 issue? I'm not sure. Anyone seen this before. Wouldn't a valid uint256 go up to 2^255 ?

Best Answer

I'm not sure what BigNumber version you have installed as part of your project.

But Truffle exposes a global Web3 instance called web3, which exposes big-number functionality.

Therefore:

If you're using Truffle v4.x, then you may as well do web3.toBigNumber(2).pow(100).
If you're using Truffle v5.x, then you may as well do web3.utils.toBN(2).pow(100).

Related Solutions

[Ethereum] Solidity error when encoding arguments to call a function with Bytes32 Type Parameters

You need to convert the value in hex to be passed. neo is 0x6e656f in hex. If you try to pass '0x6e656f' it will work (don't forget the quote).

[Ethereum] Web3 js 1.0 is throwing big number error while transfering tokens

If you are using Web3.js and your token is using the standard 10¹⁸ decimal, then you can also use web3.utils.toWei() and web3.utils.fromWei() to get to and from the big numbers you want pretty easy.

In this situation you can try this:

var amount = 1000
var tokens = web3.utils.toWei(amount.toString(), 'ether')

"1000000000000000000000"

You can then easily convert that to a BN:

var bntokens = web3.utils.toBN(tokens)

Best Answer

Related Solutions

[Ethereum] Solidity error when encoding arguments to call a function with Bytes32 Type Parameters

[Ethereum] Web3 js 1.0 is throwing big number error while transfering tokens

Related Topic