CosmJS

CosmJS is a developer library for Web3 applications, RPC access, contracts, and wallet workflows. It helps Web3 teams work with blockchain applications, smart contracts, wallets, data, and onchain infrastructure using a focused product or developer workflow.

**Use it for:**
– Build typed blockchain integrations.
– Read chain state through RPC providers.
– Send transactions and call smart contracts.
– Create scripts, backends, and application libraries.

**Best fit:** developers building application logic close to the chain.