ChainId is returning NaN

[harshuo2]

ChainId is returning an error saying it is 'undefined.' When I ran the code 15 mins ago, it was working absolutely fine. I literally didn't touch the code on this end, and started getting this error all of a sudden... How can I mitigate it?

const {chainId: chainIdHex, isWeb3Enabled } = useMoralis()
    const chainId2 = parseInt(chainIdHex)
    console.log(`Chain ID is ${chainId2}`)
    const raffleAddress= chainId2 in contractAddresses ? contractAddresses[chainId][0] : null

Error Code:

TypeError: Cannot use 'in' operator to search for 'NaN' in undefined
   9 |     const chainId2 = parseInt(chainIdHex)
  10 |     console.log(`Chain ID is ${chainId2}`)
> 11 |     const raffleAddress= chainId2 in contractAddresses ? contractAddresses[chainId][0] : null

[krakxn]

Which lesson is this precisely?

[krakxn]

You have to focus, it is because when you comment that part out - chainId2 is only declared, and when we declare a variable without any value whatsoever, it assigns a null value to it. So if you console.log it out it will result in null.

[harshuo2]

    const { chainId: chainIdHex} = useMoralis()
    const { Moralis, isWeb3Enabled } = useMoralis()
    console.log(`Chain ID is ${chainIdHex}`)

This is my new code snippet... Even here I am getting the result:
Chain ID is null.

[krakxn]

Of course, it is because there is no chains connected haha. We do it with a front-end which connects your Metamask wallet (configured w chainId)

I have quoted from Patrick below:

yarn hardhat node
Add hardhat network to your metamask/wallet
Get the RPC_URL of your hh node (usually http://127.0.0.1:8545/)
Go to your wallet and add a new network. See instructions here.
Network Name: Hardhat-Localhost
New RPC URL: http://127.0.0.1:8545/
Chain ID: 31337
Currency Symbol: ETH (or GO)
Block Explorer URL: None
Ideally, you'd then import one of the accounts from hardhat to your wallet/metamask.

[harshuo2]

Silly me, I just ran a node but didn't connect it to the metamask wallet :). Thanks

[krakxn]

It is okay, all the best

[alymurtazamemon]

@harshuo2 you should console log the chainId and contract address, it looks like one is NaN and the other is undefined.

[harshuo2]

Hey @ali-thegilfoyle I've tried to console log it, but the console is not really showing me any logs since I'm getting this error... How do I get past that?

[alymurtazamemon]

@harshuo2 so it means the program is not able to reach this point, the issue could be before it. Try console.log anything (any message) before useMoralis() call.

[harshuo2]

Hey, So I've figured out what the problem is. My program is unable to read the chainId. So when I try to console.log it, be it in Hex form or Int form, I'm unable to do so. What do you think went wrong?

[harshuo2]

Its telling me that chainId is null. I have my node up and running but I'm still getting this error...