24 stable releases (8 major)

8.0.1 Aug 8, 2019
8.0.0 Jun 3, 2019
7.0.0 Apr 9, 2019
6.1.0 Oct 16, 2018
0.2.0 May 16, 2016

#1 in Cryptocurrencies

Download history 1306/week @ 2019-04-25 1214/week @ 2019-05-02 1090/week @ 2019-05-09 1128/week @ 2019-05-16 908/week @ 2019-05-23 1288/week @ 2019-05-30 1660/week @ 2019-06-06 1318/week @ 2019-06-13 913/week @ 2019-06-20 1389/week @ 2019-06-27 1193/week @ 2019-07-04 1136/week @ 2019-07-11 796/week @ 2019-07-18 1037/week @ 2019-07-25 1128/week @ 2019-08-01

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Used in 24 crates (13 directly)


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The ABI, Application Binary Interface, is basically how you call functions in a contract and get data back.

An ABI determines such details as how functions are called and in which binary format information should be passed from one program component to the next...

An Ethereum smart contract is bytecode, EVM, on the Ethereum blockchain. Among the EVM, there could be several functions in a contract. An ABI is necessary so that you can specify which function in the contract to invoke, as well as get a guarantee that the function will return data in the format you are expecting. read more

This library encodes function calls and decodes their output.



This library intends to support only valid ABIs generated by recent Solidity versions. Specifically, we don't intend to support ABIs that are invalid due to known Solidity bugs or by external libraries that don't strictly follow the specification. Please make sure to pre-process your ABI in case it's not supported before using it with ethabi.


  • via cargo

    cargo install ethabi-cli
  • via homebrew

    brew tap paritytech/paritytech
    brew install ethabi


Ethereum ABI coder.
  Copyright 2016-2017 Parity Technologies (UK) Limited

    ethabi encode function <abi-path> <function-name> [-p <param>]... [-l | --lenient]
    ethabi encode params [-v <type> <param>]... [-l | --lenient]
    ethabi decode function <abi-path> <function-name> <data>
    ethabi decode params [-t <type>]... <data>
    ethabi decode log <abi-path> <event-name> [-l <topic>]... <data>
    ethabi -h | --help

    -h, --help         Display this message and exit.
    -l, --lenient      Allow short representation of input params.

    encode             Encode ABI call.
    decode             Decode ABI call result.
    function           Load function from json ABI file.
    params             Specify types of input params inline.
    log                Decode event log.


ethabi encode params -v bool 1



ethabi encode params -v bool 1 -v string gavofyork -v bool 0



ethabi encode params -v bool[] [1,0,false]



ethabi encode function examples/test.json foo -p 1
	"inputs": [{
	"outputs": []



ethabi decode params -t bool 0000000000000000000000000000000000000000000000000000000000000001

bool true


ethabi decode params -t bool -t string -t bool 00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000096761766f66796f726b0000000000000000000000000000000000000000000000

bool true
string gavofyork
bool false


ethabi decode params -t bool[] 00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

bool[] [true,false,false]


ethabi decode function ./examples/foo.json bar 0000000000000000000000000000000000000000000000000000000000000001

bool true


ethabi decode log ./examples/event.json Event -l 0000000000000000000000000000000000000000000000000000000000000001 0000000000000000000000004444444444444444444444444444444444444444

a bool true
b address 4444444444444444444444444444444444444444

Alternative tools

Parity Ethereum toolchain

In addition to the Parity Ethereum client, there are additional tools in this repository available:

  • evmbin - EVM implementation for Parity Ethereum.
  • ethabi - Parity Ethereum function calls encoding.
  • ethstore - Parity Ethereum key management.
  • ethkey - Parity Ethereum keys generator.
  • whisper - Implementation of Whisper-v2 PoC.


~45K SLoC