My question is nearly identical to: how to parse the value returned by truffle ?

Except that when I run:


i get

'[object Promise]'

but then if I treat as a promise and run:


I get

balance1.toString(...).then is not a function

I am running Truffle v4.1.12 (core: 4.1.12). I am trying to get the value out of the BigNumber. Can anyone help?

  • I am running my code from a truffle test script. IE with the command "truffle test /path/to/my/file.js" --network ganache" – Test1 Test2 Jul 17 '18 at 16:00

bigNumberValue is a Promise as you state also in your question. However, the way you're handling the Promise is wrong.

This should work:

balance1.then(a => {
| improve this answer | |
  • Sorry I should have made it clear that I am working in a truffle test script. Your solution works perfectly in the truffle console. But when I do the same thing in a truffle test script, I get "balance0.then is not a function". I also tried balance0.get() but I get the error "balance0.get is not a function" – Test1 Test2 Jul 17 '18 at 15:58
  • It seems that balance1.toString() works from the truffle test script. Here is what confuses me: if I console.log(balance1) either from the truffle console or truffle test script I get "{ s: 1, e: 0, c: [ 0 ] }". But balance.toString() works from the test script, but does not work from the console... I don't understand the difference – Test1 Test2 Jul 17 '18 at 16:14

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