Solana launches v3 of its JavaScript SDK to streamline app development

The new @solana/web3.js release rebuilds legacy classes on Solana Kit to shrink bundle sizes, with breaking changes developers will need to plan around Solana has shipped version 3 of its JavaScript SDK, and it is the kind of upgrade developers notice in their codebases before anyone notices it on a chart. The release, @solana/web3.js v3 , was announced on October 6, 2026, via the @solana_devs account on X. Its pitch is simple: smaller app bundles, cleaner dependencies and one consistent way to build JavaScript apps on Solana. That matters because the SDK sits underneath a huge share of Solana apps. Packages tied to it logged over 3 million downloads in a recent week, so any change here ripples outward fast.

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