eth_estimateGas
Estimate gas needed for execution of given contract
web3.eth.estimateGas(callObject [, callback])
Parameters
A transaction object.
(optional) Optional callback, returns an error object as first parameter and the result as second.
Returns
the used gas for the simulated call/transaction.
Example
web3.eth.estimateGas({
from : account1,
to : account2
}).then(console.log);
> 21000
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