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web3.js

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web3.js

web3.js was a TypeScript/JavaScript library for connecting dApps with the Ethereum blockchain, sunset on March 4th, 2025.

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What is web3.js?

web3.js was a TypeScript/JavaScript library created to help developers connect their dApps 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.

Stream any onchain event for web3.js with Custom Webhooks

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App 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.

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