Tevm

JavaScript-Native Ethereum Virtual Machine

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Note: we are near the end of a large rewrite to zig. It is expected we get a new stable version of Tevm in November

🚀 The EVM for TypeScript, JavaScript, and the Modern Web

Tevm puts an Ethereum node anywhere JavaScript runs—Node, browser, serverless, edge, or desktop. Instantly fork mainnet, simulate complex contracts, and run full-stack devnets, all with TypeScript-first safety and blazing speed.

If you use **viem**, **wagmi**, **0x**, or build modern Ethereum apps, Tevm is the engine that powers next-level shipping, testing, and UX.

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✨ Why Tevm?

• ⚡ Ship at Lightspeed: Instant feedback. Test and deploy with no wait, no Docker, no slow subprocesses. Build and iterate like the Rust and Go elite—now in JS.
• 🚫 Goodbye, Loading Spinners: Deliver real optimistic UI. Run every contract locally for true instant dapp experiences—no more waiting on RPCs.
• 🔒 TypeScript-Native Confidence: End-to-end type safety and autocompletion. Import Solidity, call contracts, and simulate transactions with zero guesswork.
• 🌐 Mainnet-Grade Simulation: Fork any EVM chain—mainnet, L2, L3—and manipulate state locally with full fidelity.
• 🧪 Unmatched Testing Power: Write robust integration tests, simulate reorgs, verify gas, and check UX edge cases, all in one toolkit.
• 💻 True Local-First: Full EVM in Node, browser, or edge—offline or online, always in your control.
• 🎯 The Fastest Path from Idea to User: Tevm Compiler brings Solidity into your codebase with real types, letting you ship faster and safer than ever before.
• ⚡ Optimistic Updates, Advanced Gas Modeling: Build dapps that feel like Web2 and simulate costs with precision, in JS/TS.

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🛠️ The Tevm Ecosystem

Everything you need to build, simulate, and ship at the speed of your ideas.

1. Tevm Node: Instant, In-Memory Ethereum

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