In React, I use a Web3js call function to get a value. The returned value is in Wei. However, I want to render it in Ethers. What would be the best way to do it?


In web3.js 1.0, use this:

web3.utils.fromWei(number [, unit])



I think you're looking for fromWei. In web3.js 0.2x.x:

web3.fromWei(n, 'ether')
  • Thanks for the answer. For some reason, I'm getting "Cannot read property 'fromWei' of null" – Ruham Mar 5 '18 at 6:04
  • Is web3 null? – user19510 Mar 5 '18 at 6:05
  • No, the function returning Wei works. I imported Web3 from 'web3', and set a current provider. – Ruham Mar 5 '18 at 6:09
  • let web3 = new Web3(Web3.currentProvider) after which {web3.fromWei(price, 'ether')} – Ruham Mar 5 '18 at 6:10
  • And now, the error is: new BigNumber() not a number: [object Object] – Ruham Mar 5 '18 at 6:10

web3.utils.fromWei(yourValue, 'ether')

^^^ You must use the utils library. If you're getting the weird, TypeError: web3.fromWei is not a function and you're trying to console log the output, try setting the function call to a constant and then console logging that constant. Like so...

yourValue = returned amount of ether

returnValue = web3.utils.fromWei(yourValue, 'ether')


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