web3.js
web3.js was a TypeScript/JavaScript library for connecting apps with the Ethereum blockchain, sunset on March 4th, 2025.
What is web3.js?
web3.js was a TypeScript/JavaScript library created to help developers connect their apps with information on the Ethereum blockchain. Using its modular libraries, developers could interact with smart contracts as TypeScript/JavaScript objects, subscribe to on-chain events, get block state directly from Ethereum nodes, and more. Its version 4 was rewritten in TypeScript and provided new features like Plugins. The library had over 500,000 weekly downloads and was used by industry-leading projects such as Truffle. Note: Web3.js libraries were sunset on March 4th, 2025. For migration guides and more details, refer to the ChainSafe blog.
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Developer resources from Alchemy
A developer's guide to the web3 stack
The web3 stack in 2026, layer by layer: networks, infrastructure, smart contracts, wallets, frontends, storage, applications, and the new agentic layer.
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We moved compression for large RPC responses to a better layer in our serving path, cutting P95 latency on heavy calls and reducing connection churn.
How Enya Labs migrated Boba Network to our rollups in less than 1 hour
With deep OP Stack customizations and rapid growth, Boba turned to Alchemy Rollups for a seamless, sub-hour migration and a scalable, developer-ready foundation.
web3.js alternatives
Explore web3 competitors and apps like web3.js.
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Orderly Network
Kurtosis
AarcApp store listings are independently reviewed and written by Alchemy using a combination of inbound submissions, editorial research, public project sources, and third-party directories, including ecosystem data from The Grid under the Open Database License, DefiLlama, DappRadar, Reown, and chain ecosystem pages.
