# fnv1a52 > A fast 52-bit FNV-1a hash implementation for JavaScript. Latest version **1.0.0** (published 2026-07-26) · MIT license · 0 weekly downloads ## Install ```sh npm install fnv1a52 pnpm add fnv1a52 yarn add fnv1a52 bun add fnv1a52 ``` ## Health **Score 75/100 (B)** — status: active. Positive: has types; esm support; no vulnerabilities; has provenance; recently updated; high maintenance score; high quality score. Warnings: low downloads. ## Facts | | | |---|---| | Version | 1.0.0 | | Published | 2026-07-26 | | First published | 2026-07-26 | | Weekly downloads | 0 | | License | MIT | | TypeScript types | bundled | | Module format | ESM + CommonJS | | Node | >=18.0.0 | | Dependencies | 0 | | Unpacked size | 9.3 KB | | Known vulnerabilities | 0 | | Install scripts | no | | Provenance | attested (GitHub Actions) | | GitHub stars | 1 | | Author | SukkaW | | Maintainers | sukkaw | | Keywords | fnv, fnv1a, fnv-1a, fnv1a52, base36, hash, hashing, checksum | ## Links - npm: https://www.npmjs.com/package/fnv1a52 - Repository: https://github.com/SukkaW/fnv1a52 - npm.io page: https://npm.io/package/fnv1a52 ## Alternatives - [@gemini-wallet/core](https://npm.io/package/@gemini-wallet/core.md) — 515.6K weekly downloads - [utility](https://npm.io/package/utility.md) — 416.6K weekly downloads - [@primno/dpapi](https://npm.io/package/@primno/dpapi.md) — 7.2K weekly downloads - [pi-readseek](https://npm.io/package/pi-readseek.md) — 3.7K weekly downloads - [@emilia-protocol/verify](https://npm.io/package/@emilia-protocol/verify.md) — 1.1K weekly downloads ## Recent versions - 1.0.0 (latest) — 2026-07-26 - 1.0.0-beta.1 (next) — 2026-07-26 - 0.0.0 — 2026-07-26 ## README # fnv1a52 > A fast 52-bit [FNV-1a](https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function) hash implementation for JavaScript 52 bits provides a larger hash space than the classic 32-bit FNV-1a while still fitting entirely inside JavaScript's 53-bit safe integer range (double precision) — so the result is a plain `number`, no `BigInt` required. Zero dependencies. The implementation is based on prior work by [@tjwebb](https://github.com/tjwebb) (Travis Webb) and [@desudesutalk](https://github.com/desudesutalk) under the MIT license, with extra simplifacations and optimizations (like inline lookup table and faster hex conversion). > If you need full 64 bits hash space, check out [@danielroe](https://github.com/danielroe)'s https://github.com/danielroe/fnv1a-64 ## Install ```sh pnpm add fnv1a52 yarn add fnv1a52 npm install fnv1a52 ``` ## Usage ```js import { fnv1a52, fnv1a52base36, fnv1a52hex } from 'fnv1a52'; console.log(fnv1a52('hello world')); //=> 2926792616498590 console.log(fnv1a52hex('hello world')); //=> 'a65e7023cd59e' console.log(fnv1a52base36('hello world')); //=> '0stglysbf6m' ``` > You should NEVER `fnv1a52().toString(16)`! `fnv1a52hex` can get you a fixed length zero-padded hex string **up to 6x faster** via a byte-to-hex lookup table. > The same applies to `fnv1a52().toString(36)` — always use `fnv1a52base36` instead, which can get you a fixed length zero-padded hex string **up to 3x faster**. ## API ### `fnv1a52(str)` Returns the 52-bit FNV-1a hash of `str` as a `number`. - **str**: `string` ### `fnv1a52hex(str)` Returns the 52-bit FNV-1a hash of `str` as a lowercase hexadecimal `string` (fixed length, zero-padded). - **str**: `string` Prefer this over `fnv1a52(str).toString(16)` — it uses a byte-to-hex lookup table and is up to 6x faster. Note the fixed length means this is **not** always equal to `fnv1a52(str).toString(16)`: a hash below `16 ** 12` keeps its leading zero here, while `toString(16)` drops it. ### `fnv1a52base36(str)` Returns the 52-bit FNV-1a hash of `str` as a lowercase base36 `string` (fixed length, zero-padded). - **str**: `string` Prefer this over `fnv1a52(str).toString(36)` as it is up to 3x faster. ## Benchmark ``` $ pnpm run bench clk: ~3.15 GHz cpu: Apple M2 Max runtime: node 24.18.0 (arm64-darwin) • fnv1a52 - hex ------------------------------------------------ ------------------------------- fnv1a52 + toString(16) 656.58 ns/iter fnv1a52hex 120.82 ns/iter • fnv1a52 - base36 ------------------------------------------------ ------------------------------- fnv1a52 + toString(36) + padStart 506.29 ns/iter fnv1a52base36 137.43 ns/iter ``` ## License [MIT](LICENSE) ---- **fnv1a52** © [Sukka](https://github.com/SukkaW), Released under the [MIT](./LICENSE) License. Authored and maintained by Sukka with help from contributors ([list](https://github.com/SukkaW/fnv1a52/graphs/contributors)). > [Personal Website](https://skk.moe) · [Blog](https://blog.skk.moe) · GitHub [@SukkaW](https://github.com/SukkaW) · Telegram Channel [@SukkaChannel](https://t.me/SukkaChannel) · Mastodon [@sukka@acg.mn](https://acg.mn/@sukka) · Twitter [@isukkaw](https://twitter.com/isukkaw) · BlueSky [@skk.moe](https://bsky.app/profile/skk.moe)

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