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Abi Decoder

Abi Decoder is a JavaScript library that decodes Ethereum transaction method input and transaction-receipt logs into structured values using contract ABIs supplied by the developer.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Abi Decoder — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when an application has Ethereum transaction input or receipt logs and the matching contract ABI, and needs to present decoded method or event data.

Who it is for

  • JavaScript and Node.js developers building Ethereum transaction viewers or dApp debugging interfaces.
  • Developers who need to inspect method input or event logs for contracts whose ABIs they can provide.

Documented uses

  • Decode encoded Ethereum transaction input into method details.
  • Convert transaction-receipt logs into decoded event data.
  • Add decoding to a Node.js utility or browser-based inspection interface.
Before you choose

Requirements & limits

  • The contract ABI must be supplied manually before decoding.
  • The documented examples cover method input and logs from a transaction receipt.
  • The README documents npm and Bower installation and Node.js and browser-script use.
  • The repository specifies a GPL-3.0 license.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Decode Ethereum transaction method input

Set up Abi Decoder with a contract ABI and pass transaction input data to its method decoder.

Before you start

  • Node.js or a browser JavaScript setup
  • Abi Decoder installed through npm or Bower, or loaded from the documented Bower browser script
  • The relevant contract ABI and encoded transaction input

Steps

  1. Install the library with npm or Bower, or load its browser script.

  2. Import or instantiate the library in the chosen environment.

  3. Pass the contract ABI to addABI.

  4. Pass the encoded transaction input to decodeMethod.

Expected outcome

The library returns decoded method data for the supplied transaction input.

Guide limitations

  • The relevant ABI must be provided manually.
  • The example documents decoding input data, not submitting or retrieving transactions.
Documentation 1 ↗
Source-based practical guide

Decode logs from a transaction receipt

Pass receipt logs to Abi Decoder to obtain decoded event records.

Before you start

  • Abi Decoder installed and instantiated in Node.js or a browser JavaScript setup
  • The relevant contract ABI added manually
  • A transaction receipt with logs, obtained through a Web3 call as in the repository example

Steps

  1. Add the contract ABI with addABI.

  2. Obtain the transaction receipt and its logs.

  3. Pass the receipt logs to decodeLogs.

Expected outcome

The library returns decoded log data for the supplied receipt logs.

Guide limitations

  • The documented example uses Web3 to obtain the receipt; receipt retrieval is a separate step.
  • The relevant ABI must be provided manually.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
14 October 2026
Original website title
Consensys/abi-decoder · Official homepage title · retained in its source language
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