# @solana/sysvars > An abstraction layer over signing messages and transactions in Solana Latest version **8.3.0** (published 2026-09-09) · MIT license · 0 weekly downloads ## Install ```sh npm install @solana/sysvars pnpm add @solana/sysvars yarn add @solana/sysvars bun add @solana/sysvars ``` ## Health **Score 70/100 (B)** — status: active. Positive: has types; esm support; no vulnerabilities; has provenance; recently updated; high maintenance score. Warnings: low downloads. ## Facts | | | |---|---| | Version | 8.3.0 | | Published | 2026-09-09 | | First published | 2024-03-14 | | Weekly downloads | 0 | | License | MIT | | TypeScript types | bundled | | Module format | ESM + CommonJS | | Node | >=20.18.0 | | Dependencies | 6 | | Unpacked size | 416.3 KB | | Known vulnerabilities | 0 | | Install scripts | no | | Provenance | attested (GitHub Actions) | | GitHub stars | 695 | | Author | Solana Labs Maintainers | | Maintainers | solana-devs | | Keywords | blockchain, solana, web3 | ## Links - npm: https://www.npmjs.com/package/@solana/sysvars - Repository: https://github.com/anza-xyz/kit - Homepage: https://www.solanakit.com/api#solanasysvars - Issues: https://github.com/anza-xyz/kit/issues - npm.io page: https://npm.io/package/@solana/sysvars ## Dependencies (6) - [@solana/errors](https://npm.io/package/@solana/errors.md) 8.3.0 - [@solana/accounts](https://npm.io/package/@solana/accounts.md) 8.3.0 - [@solana/rpc-types](https://npm.io/package/@solana/rpc-types.md) 8.3.0 - [@solana/codecs-core](https://npm.io/package/@solana/codecs-core.md) 8.3.0 - [@solana/codecs-numbers](https://npm.io/package/@solana/codecs-numbers.md) 8.3.0 - [@solana/codecs-data-structures](https://npm.io/package/@solana/codecs-data-structures.md) 8.3.0 ## Recent versions - 8.3.0 (latest) — 2026-09-09 - 8.4.0-canary-20260924083259 (canary) — 2026-09-24 - 5.1.0-experimental-20251205104522 (experimental) — 2025-12-05 - 4.0.0 (4x) — 2025-10-08 - 3.0.3 (3x) — 2025-09-11 - 2.0.0 (next) — 2024-11-07 - 2.0.0-rc.4 (rc) — 2024-11-05 - 2.0.0-preview.4.20240731091009.c2717fc498afa3228c8f8b01600a575989afae99 (preview) — 2024-07-31 - 2.0.0-preview.4 (tp4) — 2024-07-02 - 2.0.0-preview.3 (tp3) — 2024-04-25 - 8.4.0-canary-20260923083123 — 2026-09-23 - 8.4.0-canary-20260922155338 — 2026-09-22 - 8.4.0-canary-20260922151509 — 2026-09-22 - 8.4.0-canary-20260922084122 — 2026-09-22 - 8.4.0-canary-20260922083419 — 2026-09-22 - … 1717 more at https://npm.io/package/@solana/sysvars/versions ## README [![npm][npm-image]][npm-url] [![npm-downloads][npm-downloads-image]][npm-url]
[![code-style-prettier][code-style-prettier-image]][code-style-prettier-url] [code-style-prettier-image]: https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square [code-style-prettier-url]: https://github.com/prettier/prettier [npm-downloads-image]: https://img.shields.io/npm/dm/@solana/sysvars?style=flat [npm-image]: https://img.shields.io/npm/v/@solana/sysvars?style=flat [npm-url]: https://www.npmjs.com/package/@solana/sysvars # @solana/sysvars This package contains types and helpers for fetching and decoding Solana sysvars. It can be used standalone, but it is also exported as part of Kit [`@solana/kit`](https://github.com/anza-xyz/kit/tree/main/packages/kit). More information about the available sysvars on Solana can be found in the docs at . All currently available sysvars can be retrieved and/or decoded using this library. ## Sysvar API This package offers a simple API for working with sysvars. One can fetch an encoded sysvar account using an RPC client. ```ts const maybeEncodedClock = await fetchEncodedSysvarAccount(rpc, SYSVAR_CLOCK_ADDRESS); maybeEncodedClock satisfies MaybeEncodedAccount<'SysvarC1ock11111111111111111111111111111111'>; ``` One can also attempt to fetch a JSON-parsed sysvar account. ```ts const maybeJsonParsedClock = await fetchJsonParsedSysvarAccount(rpc, SYSVAR_CLOCK_ADDRESS); maybeJsonParsedClock satisfies | MaybeAccount | MaybeEncodedAccount<'SysvarC1ock11111111111111111111111111111111'>; ``` Each sysvar within the library ships with its own [codec](https://github.com/anza-xyz/kit/tree/main/packages/codecs) for deserializing the account data. You can pair this codec with the helpers from [`@solana/accounts`](https://github.com/anza-xyz/kit/tree/main/packages/accounts) to assert and decode sysvar account data. ```ts // Fetch. const clock = await fetchEncodedSysvarAccount(rpc, SYSVAR_CLOCK_ADDRESS); clock satisfies MaybeEncodedAccount<'SysvarC1ock11111111111111111111111111111111'>; // Assert. assertAccountExists(clock); clock satisfies EncodedAccount<'SysvarC1ock11111111111111111111111111111111'>; // Decode. const decodedClock = decodeAccount(clock, getSysvarClockDecoder()); decodedClock satisfies Account; ``` Each supported sysvar also ships with its own fetch-and-decode function to perform the steps above and return the decoded sysvar data. ```ts const clock: SysvarClock = await fetchSysvarClock(rpc); ``` ## Supported Sysvars: This package supports the following Solana sysvars: - [`Clock`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/clock.ts) - [`EpochRewards`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/epoch-rewards.ts) - [`EpochSchedule`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/epoch-schedule.ts) - [`LastRestartSlot`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/last-restart-slot.ts) - [`RecentBlockhashes`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/recent-blockhashes.ts) - [`Rent`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/rent.ts) - [`SlotHashes`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/slot-hashes.ts) - [`SlotHistory`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/slot-history.ts) - [`StakeHistory`](https://github.com/anza-xyz/kit/tree/main/packages/sysvars/src/stake-history.ts) The `Instructions` sysvar is also supported but does not exist on-chain, therefore has no corresponding module or codec. --- _Source: https://npm.io/package/@solana/sysvars · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._