title: EthereumJS / EF Javascript

description: Ethereum Layer 1 Protocol Implementations in TypeScript.

background-color: #fff;

The <b>JavaScript team</b> is a team within the <a href="https://ethereum.foundation/">Ethereum Foundation</a>.

See the <a href="https://github.com/ethereumjs/"><b>EthereumJS</b></a> GitHub as a main entrypoint to our code or reach out to us directly on <a href="https://github.com/ethereumjs/"><b>Discord</b></a>.

<h1>Who we are?</h1>

<p>We are currently a team of 7 - see <a href="https://x.com/0xstark/status/1922642395654394082" target="_blank">org chart</a> aside - doing both "everyday" Ethereum Layer 1 coding as well as EIP research and specification work.</p>

<p>Due to the nature of our work, our team is placed very much at the crossroads of developer tooling and the Ethereum Layer 1 protocol. If this resonates with you and you look for an exchange or cooperation, please reach out!</p>

<img src="/assets/images/ef_org.jpg" alt="Ethereum Foundation - Org Chart">

</div>

<h1>What we do?</h1>

<h3>Pectra-Ready Protocol Stack</h3>

<p>We provide an up-to-date Ethereum Layer 1 protocol implementation for the TypeScript

and browser community. This includes a Pectra-ready EVM but also other secure and

browser-ready libraries for dApps, tools and websites. Main code entrypoint here is the EthereumJS

<a href="https://github.com/ethereumjs/ethereumjs-monorepo">monorepo</a>.

</p>

<img src="/assets/images/evm_example.png" alt="TypeScript EVM - Code Example">

</div>

<h3>Protocol R&D</h3>

<p>We do various early-on EIP code integrations, see e.g. <a href="https://github.com/ethereumjs/ethereumjs-monorepo/pull/3976">PeerDAS</a>, <a href="https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/binarytree">Binary Tree</a> or native <a href="https://github.com/ethereumjs/ethereumjs-monorepo/pull/3849">SSZ</a> as examples. Along the way we engage in research calls and help with spec refinements on the EIP GitHub like <a href="https://github.com/ethereum/EIPs/pull/9460">here</a> and do coverage work and contribute test cases to the execution-spec-tests GitHub like <a href="https://github.com/ethereum/execution-spec-tests/pull/1371">here</a>. Our EthereumJS <a href="https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/client" alt="GitHub URL">research client</a> is an important enabler for this work.

</p>

<img src="/assets/images/debug.png" alt="TypeScript EVM - Code Debugging">

<h3>Portal Network</h3>

<p>Beside we have our own TypeScript implementation - called <a href="https://github.com/ethereumjs/ultralight">Ultralight</a> - for the <a href="https://github.com/ethereum/portal-network-specs">Portal Network</a>, which now gets its first production usage as a decentralized distributing system for historical block data to enable EIP-4444 history data expiry. We will continue to actively contribute to specification and testing for upcoming network types like the Portal state network.

</p>

</div>

<div class="repo-group">

<img src="/assets/images/ultralight_github.png" alt="Ultralight - Ethereum Portal Network Client (GitHub)">

<h3>Dedicated Stateless Reserach</h3>

<p>We are engaged into research around statelessness for some time now and joined early Verkle/Stateless

<a href="https://github.com/ethpandaops/verkle-devnets">test networks</a> and contributed to both testing and research. We did both <a href="https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/verkle">Verkle</a> and

<a href="https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/binarytree">Binary Tree</a> TypeScript implementations and made our client ready for stateless execution.</p>

<img src="/assets/images/verkle_testnet.png" alt="Verkle Testnet Devnet 7 - Test Monitor">

</div>

Feel inspired? Again, get in touch!