I see this document.
But I don't understand what is an index position of an uncle.

I'd like to get informations of uncle blocks like etherscan.io

However I don't know a value of the index position what should be set.

1 Answer 1


In a block multiple uncles can be included. This method returns only one uncle.

web3.eth.getUncle(blockHashOrBlockNumber, uncleIndex [, callback])

uncleIndex is a number starting from 0 which represents which uncle will be returned.

If for example a block has 2 uncles, the first uncle has uncleIndex=0 while the second uncle has uncleIndex=1.


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