How do I convert the result returned from a JSON-RPC eth_call from my geth client?

This is the call: curl -X POST --data '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x86312d97c0dd3fd9202fdbdec434f36ee1b30720", "data":"0x18160ddd"}, "latest"],"id":1}'

This is the return: {"jsonrpc":"2.0","id":1,"result":"0x00000000000000000000000000000000000000000000000000000000000f4240"}

How to convert: 0x00000000000000000000000000000000000000000000000000000000000f4240 back to human readable characters?

  • use toasci funtion – Etherkimist Jul 14 '17 at 13:53
  • I've tried web3.toAscii("0x00000000000000000000000000000000000000000000000000000000000f4240") and this is what I get: "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0fB@" – Jupiter Jul 14 '17 at 13:56
  • 1
    it depends on the return of your function toasci will work only if it return a string – Etherkimist Jul 14 '17 at 13:57
  • Yes! that is the answer. Trivial actually. – Jupiter Jul 14 '17 at 14:00

Its Hex encoded string you can convert it in to Decimal.

For web3: web3.toDecimal('0x00000000000000000000000000000000000000000000000000000000000f4240')

For javascript: parseInt('0x00000000000000000000000000000000000000000000000000000000000f4240', 16);

For PHP: hexdec('0x00000000000000000000000000000000000000000000000000000000000f4240');

// result: 1000000

For other programming languages you can search for hextodecimal function for that particular programming language.

| improve this answer | |
  • Sometimes one needs to use bignumber.js - I've received the following result 2e+21 which wouldn't work with the functions above, would only work with BigNumber(2e+21).toString(10) – Asaf Apr 19 '18 at 12:44

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