JavaScript/TypeScript SDK for Solana

Solana Kit

@solana/kit is the recommended TypeScript SDK for building on Solana. You assemble a client from composable plugins, add React bindings when you need them, and pull in generated program clients for the on-chain programs you call.

Package	Description	GitHub
@solana/kit	Core SDK: RPC, transactions, codecs, signers	Source
@solana/react	React bindings: `ClientProvider` and hooks	Source
@solana/kit-plugin-rpc	RPC connection + transaction sending	Source
@solana/kit-plugin-signer	Fee payer, identity, and signer plugins	Source
@solana/kit-plugin-wallet	Wallet Standard connection + React hooks	Source

Program clients

Generated clients that expose instruction builders and client plugins (for example tokenProgram() → client.token).

Package	Description	GitHub
@solana-program/system	Interact with System program	Source
@solana-program/token	Interact with Token program	Source
@solana-program/token-2022	Interact with Token-2022 program	Source
@solana-program/memo	Interact with Memo program	Source
@solana-program/compute-budget	Interact with Compute Budget program	Source

Signing & Key Management

For kit-compatible backend signing across multiple key management backends:

Package	Description	GitHub
@solana/keychain	Unified signing: Memory, Vault, Privy, Turnkey, AWS KMS, Fireblocks, GCP KMS, CDP, Para, Dfns, Crossmint, Openfort, Utila, Fordefi	Source

See the Keychain documentation and Choosing a backend for setup and custody-model guidance.

Solana Web3.js v3

@solana/web3.js v3 is the recommended version of web3.js. It rebuilds the classic class-based API — Connection, Keypair, Transaction, PublicKey — on top of @solana/kit internals, so it works with Kit primitives and the program clients above. Use it if you are upgrading an existing web3.js app or prefer the class-based API.

Most methods that were synchronous in the legacy SDK, such as Keypair.generate() and transaction.sign(), are now async.

npm install @solana/web3.js@3

Package	Description	GitHub
@solana/web3.js	Core SDK	Source

@solana/spl-token depends on @solana/web3.js (legacy) and does not run on v3. Use @solana-program/token or @solana-program/token-2022 instead; their generated instructions and instruction plans work directly with v3's Transaction.add().

Solana Web3.js (legacy)

@solana/web3.js (legacy, 1.x) is the original TypeScript SDK for Solana. It is in maintenance mode and receives critical fixes only. Existing codebases can upgrade to web3.js v3 or migrate to Kit.