• Introduction
• Packages Overview
• Getting Started
• Branches
• Packages Relationships
• EthereumJS
• License

This repository holds various protocol building blocks of the Ethereum blockchain execution layer and is managed by the Ethereum Foundation JavaScript team. There is a TypeScript implementation of the Ethereum Virtual Machine (EVM) ready to be used in Node.js or a browser environment, implementations of core structural blockchain building blocks like an Ethereum Tx, Block or Blockchain as well as a MPT (Merkle Patricia Tree) and devp2p (execution networking layer) implementation.

All libraries are bound together by the core Common library keeping track of chain specifics and hardfork changes. They are complemented by helper packages like RLP for data encoding/decoding or Util, providing helper functionalities like (byte) conversion, signatures, types and others.

Finally, the EthereumJS Execution Client (EthereumJS) has been in active development for some time now. It already serves a variety of purposes like testing, research (e.g. EIPs) and developer tooling to engage with the protocol.

Also to note: on the Ethereum Consensus side, the ChainSafe Lodestar repository complements this repository with an Ethereum Consensus Client implementation as well as various protocol implementations (like an SSZ library) developed in the context of Ethereum Consensus layer evolution.

Below you can find a list of the packages included in this repository.

package	npm	issues	tests	coverage
@ethereumjs/binarytree
@ethereumjs/block
@ethereumjs/blockchain
@ethereumjs/client
@ethereumjs/common
@ethereumjs/devp2p
@ethereumjs/ethash
@ethereumjs/evm
@ethereumjs/genesis
@ethereumjs/mpt
@ethereumjs/rlp
@ethereumjs/statemanager
@ethereumjs/tx
@ethereumjs/util
@ethereumjs/verkle
@ethereumjs/vm
@ethereumjs/wallet

If you're new to the EthereumJS monorepo, this section will help you get up and running quickly.

• Node.js (v18 or higher)
• npm (v8 or higher)
• Git

1. Clone the repository and initialize submodules:

git clone https://github.com/ethereumjs/ethereumjs-monorepo.git
cd ethereumjs-monorepo
git submodule init
git submodule update

2. Install dependencies:

npm install

See our Development docs for an overview on things like tooling or configuration if you want to contribute to the EthereumJS monorepo. 🙂

The following are our currently relevant main branches for active and former release series:

Breaking releases are mostly done in sync for all libraries (latest exceptions: VM v8, EVM v3). Starting with the spring 2025 release series, we have aligned all package versions to have the same major version number. This makes it easier to clearly identify package versions compatible with each other as well as reason about functionality or bugs for a certain release series.

Old release cycles up to the VM v7/v8 version were named after the @ethereumjs/vm version. In most cases PRs should be opened towards the current working branch. If there is no current working branch, please ask! 🙂

To inspect code related to a specific package version, refer to the tags.

 graph TD
   vm{vm}
   client{client}
   ethash --> blockchain
   ethash --> client
   devp2p --> client
   block --> client
   block --> blockchain
   block --> ethash
   block --> vm
   blockchain --> client
   mpt --> client
   mpt --> vm
   mpt --> blockchain
   mpt --> block
   mpt --> statemanager
   verkle --> vm
   verkle --> evm
   verkle --> statemanager
   binarytree --> vm
   binarytree --> statemanager
   util --> common
   common --> block
   common --> statemanager
   common --> tx
   common --> blockchain
   common --> vm
   common --> evm
   common --> client
   common --> devp2p
   common --> genesis
   evm --> vm
   evm --> client
   genesis --> client
   genesis --> statemanager
   genesis --> mpt
   tx --> block
   tx --> vm
   tx --> client
   vm --> client
   rlp --> util
   statemanager --> evm
   statemanager --> vm
   statemanager --> client

To update the diagram above edit the README file and open a new PR with the changes.

The EthereumJS GitHub organization and its repositories are managed by the Ethereum Foundation JavaScript team, see our website for a team introduction. If you want to join for work or carry out improvements on the libraries see the developer docs for an overview of current standards and tools and review our code of conduct.

Most packages are MPL-2.0 licensed, see package folder for the respective license.