[SOLVED] How to use Moralis.Unit on undefined values?

Moralis General
#1

Hey guys,

I’m currently trying to convert a value in Wei to a MATIC value in my front end. I get the numbers from my database, so they are undefined at first. This stops me from using .toString. If I were able to use .toString, I would use:

const tokenValue = Moralis.Units.FromWei(balance.toString)

However, I’m not able to use this.

How can I represent a number in MATIC on my front end, assuming my database stores values in wei?

Thanks!

#2

it looks like you have to get the balance first somehow from the database to display it in frontend, after that you can convert it

how do you get that balance?

#3

I get the balance using Moralis Query and pass it in to a component as a prop. That’s not where the issue is. Do you know how I can convert it?

#4

can you display it in the first place without to convert it?
what type of column is the data that contains that balance?

did you try JSON.stringify?

#5

Yep, I can display it correctly. Everything is working correctly, the only issue is I need to get from a number like: 1000000000000000000 wei to a number in matic.

I would simply divide it, however you can’t divide by such large values in js.

#6

try something like this:

const tokenValue = Moralis.Units.FromWei(balance) + 0

and then try to convert it to string

#7

This gives invalid BigNumber value error.

#8

Try to add so logging to see what happens. What is the type of the parameter

#9

It’s saved as a string in the database (just checked, I thought it was saved as a number). However, if I try const tokenValue = Moralis.Units.FromWei(balance) I get Error: invalid BigNumber string (argument="value", value="NaN", code=INVALID_ARGUMENT, version=bignumber/5.7.0). I get the same even if I add + 0

Also, balance works if I pass it in regularly, so I don’t know why it says ‘value=NaN’ in that line.

#10

Just got it. I used const tokenValue = Moralis.Units.FromWei(balance == undefined ? '0' : balance)

I think it takes sometime to receive the value from the database, but this works like a charm.

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