How to initiate a transaction with address and privateKey using web3js

Question

I have a list of ethereum addresses and private keys, I need to write an automation script which checks for the balance in each address and transfer the balance funds to another ethereum address. My question is how I perform the fund transfer with address and privateKey using web3js

Thanks in Advance

Answer 1

If you want to programmatically create transactions for accounts where you have the private key, you can call the web3.eth.accounts.signTransaction function to create a transaction using web3.js:

web3.eth.accounts.signTransaction(tx, privateKey [, callback]);

This will return a rawTransaction string which can be directly sent to the network using web3.eth.sendSignedTransaction:

web3.eth.sendSignedTransaction(signedTransactionData [, callback])

Getting the balance of the account should be even simpler. Just call web3.eth.getBalance for the public address you have for that account:

web3.eth.getBalance(address [, defaultBlock] [, callback])

I hope this helps!