# ethereumjs/ethereumjs-monorepo

Ethereum L1 Protocol Stack and EVM in TypeScript

Repository: https://github.com/ethereumjs/ethereumjs-monorepo
Canonical: https://ross.abutalabs.com/products/ethereumjs-monorepo
Language: TypeScript
License Family: other
Topics: javascript, ethereum, ethereumjs, evm, virtual-machine, vm, bytecode, typescript, monorepo, client, mpt
Last push: 2026-08-25T11:06:06+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 86, longevity 100
- inputs: {"age_days": 4072, "days_push": 8, "days_rel": 12, "gap_med": 0, "n_releases_24m": 68}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2756, forks 852 (observed 2026-08-28T04:07:18.187106+00:00)

## What it is
A modular TypeScript monorepo of Ethereum execution-layer libraries including an EVM interpreter, transaction and block handling, Merkle Patricia Trie state, and chain configuration. Packages are composable, spec-tested against mainnet hardforks, and run in Node.js or the browser.

## Use cases
- execute ethereum smart contract bytecode in javascript
- run and replay ethereum transactions in nodejs
- build and validate ethereum blocks programmatically
- create sign and parse ethereum transactions
- generate merkle proofs for ethereum state
- embed an evm in a browser app
- test custom opcodes and precompiles
- build a lightweight ethereum client without running a full node

## When to choose
- you need programmatic access to ethereum execution semantics in TypeScript or JavaScript
- you want composable primitives instead of a full client
- you need browser-compatible ethereum tooling
- you are building tests, tooling, or simulations against specific hardforks

## When to avoid
- you need a production full node with JSON-RPC and peer-to-peer networking
- you work in a language other than JavaScript or TypeScript
- you need layer-2 or non-EVM chain support

## Facets
- artifact type: library
- maturity: active
- function: interpreter, serialization, cryptography, developer-tools, sdk
- domain: blockchain, developer-tools
- platform: browser, cross-platform
- tags: ethereum, evm, virtual-machine, merkle-trie, smart-contracts, execution-layer, monorepo, blockchain-client, cryptocurrency, algorithms, nodejs, typescript, javascript

## Member repositories
- ethereumjs/ethereumjs-monorepo (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:18.187106+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T08:18:50.900629+00:00, confidence not recorded.
  - readme: https://github.com/ethereumjs/ethereumjs-monorepo (fetched 2026-08-28T04:07:18.187106+00:00, sha 24c97d6054c1)
- Data as of 2026-08-30T08:39:29.467469+00:00.