Expected value back:
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You can use the BigNumber library:
var value_wei = "0x2c1c986f1c48000"; var value_ether = new BigNumber(value_wei).dividedBy(new BigNumber("1000000000000000000");
Note that all functions in web3.js always return values in wei as a BigNumber object, so the return of web3.eth.getBalance(...) can be directly used with the lines above, for example.