ethereumjs-monorepo

EthereumJS Monorepo

Modular TypeScript libraries for Ethereum execution-layer protocol work.

Composable, spec-tested building blocks for the Ethereum execution layer: EVM execution, transactions, blocks, state, tries, and chain configuration. Use them in Node.js or the browser — tree-shakeable, Noble crypto by default, WASM-free unless you opt in.

• Spec-tested execution — tracks mainnet hardforks (status ↓)
• Composable primitives — mix tx, block, mpt, statemanager, and friends instead of pulling in a full client
• Browser-ready — controlled dependency set; package READMEs cover bundler and KZG setup where needed

Maintained by former members of the Ethereum Foundation JavaScript team and the broader Ethereum community.

Hardfork status

What do you want to do?

Quick start

Install the VM (includes EVM, tx, and state wiring):

npm install @ethereumjs/vm @ethereumjs/common @ethereumjs/tx @ethereumjs/util

Run a simple signed transfer against an in-memory state (adapted from packages/vm/examples/runTx.ts):

import { Common, Hardfork, Mainnet } from '@ethereumjs/common'
import { createLegacyTx } from '@ethereumjs/tx'
import {
  createAccount,
  createAddressFromPrivateKey,
  createZeroAddress,
  hexToBytes,
} from '@ethereumjs/util'
import { createVM, runTx } from '@ethereumjs/vm'

const common = new Common({ chain: Mainnet, hardfork: Hardfork.Prague })
const vm = await createVM({ common })

const senderKey = hexToBytes(`0x${'20'.repeat(32)}`)
const sender = createAddressFromPrivateKey(senderKey)
await vm.stateManager.putAccount(sender, createAccount({ nonce: 0n, balance: BigInt(1e18) }))

const tx = createLegacyTx({
  gasLimit: 21000n,
  gasPrice: 1_000_000_000n,
  value: 1n,
  to: createZeroAddress(),
}).sign(senderKey)

const res = await runTx(vm, { tx })
console.log(res.totalGasSpent) // 21000n

For bytecode-only execution use @ethereumjs/evm (examples). For blob (EIP-4844) transactions you need a separate KZG library — see KZG setup in the tx README.

Package map

Active packages (published in sync on v10; see scripts/release-npm.ts):

Codec and primitives

Package	Role	Docs
@ethereumjs/rlp	RLP encode/decode	README
@ethereumjs/util	Bytes, accounts, addresses, signatures	README

Configuration

Package	Role	Docs
@ethereumjs/common	Chains, hardforks, EIP parameters	README
@ethereumjs/genesis	Genesis state for known chains	README
@ethereumjs/beacon-light	Consensus light-client sync committee verifier	README

Protocol types

Package	Role	Docs
@ethereumjs/tx	Legacy, 1559, 2930, 4844, 7702 transactions	README
@ethereumjs/block	Blocks, headers, withdrawals	README

State

Package	Role	Docs
@ethereumjs/mpt	Merkle Patricia Trie and proofs	README
@ethereumjs/binarytree	EIP-7864 binary tree	README
@ethereumjs/statemanager	Merkle, RPC, and binary-tree state backends	README

Execution

Package	Role	Docs
@ethereumjs/evm	EVM interpreter, opcodes, precompiles	README
@ethereumjs/vm	runTx, runBlock, block building	README

Chain storage

Package	Role	Docs
@ethereumjs/blockchain	Canonical chain storage and validation	README

Networking

Package	Role	Docs
@ethereumjs/devp2p	devp2p DPT discovery, RLPx, ETH/SNAP wire protocols	README

Other packages

Package	Role	Notes
@ethereumjs/e2store	Era / Era1 / E2HS archive formats	Deprecation under consideration
@ethereumjs/ethash	Ethash PoW verification	Maintained for deps; not in active release round

How packages fit together

Full responsibility matrix, execution flow (runBlock → runTx → evm), and release notes: ARCHITECTURE.md.

Contribute

Releases: active development on master (v10). Maintenance branches and breaking-release policy: DEVELOPER.md § Releases.

Clone and build:

git clone https://github.com/ethereumjs/ethereumjs-monorepo.git
cd ethereumjs-monorepo
npm install

Tooling, CI, conventions, and release process: DEVELOPER.md · CONTRIBUTING.md.

Community

The EthereumJS GitHub organization is maintained by the former Ethereum Foundation JavaScript team and contributors. Join Discord for questions and follow the Code of Conduct.

Related: Lodestar — TypeScript consensus client and SSZ tooling for the Ethereum consensus layer.

License

Most packages are MPL-2.0 licensed; see each package folder for its license file.