--- title: "Package Reference" description: "List and guide to UniKVS packages." --- UniKVS consists of the core `unikvs` package plus plugin and utility packages. Install everything except `unikvs` only as needed. See [installation](/unikvs/en/how-to/installation) for setup, and [storage comparison](/unikvs/en/reference/comparison) for choosing a backend. ## Core [#core] **[UniKVS](/unikvs/en/packages/unikvs)** The core package with the config builder and KVS client. ## Shared [#shared] Shared foundations used by all packages. **[@unikvs/core](/unikvs/en/packages/core)** Shared types and errors for all packages. **[@unikvs/utils](/unikvs/en/packages/utils)** Shared helper functions for plugin authors. **[@unikvs/testing](/unikvs/en/packages/testing)** Test contexts and helpers for plugins. ## Storage [#storage] Backends that provide data persistence. They differ by runtime environment. **[@unikvs/memory](/unikvs/en/packages/memory)** Store arbitrary values in memory. **[@unikvs/http](/unikvs/en/packages/http)** Use an HTTP server as a backend. **[@unikvs/null](/unikvs/en/packages/null)** Discard everything; use as a no-op sink. **[@unikvs/lru-cache](/unikvs/en/packages/lru-cache)** Store data in memory with entry or capacity limits. **[@unikvs/opfs](/unikvs/en/packages/opfs)** Store data in the browser OPFS. **[@unikvs/indexeddb](/unikvs/en/packages/indexeddb)** Store data in the browser IndexedDB. **[@unikvs/localstorage](/unikvs/en/packages/localstorage)** Store data in the browser Local Storage. **[@unikvs/session-storage](/unikvs/en/packages/session-storage)** Store strings in the browser sessionStorage. **[@unikvs/fs.node](/unikvs/en/packages/fs-node)** Store data in the Node.js local filesystem. **[@unikvs/s3.node](/unikvs/en/packages/s3-node)** Store data in S3-compatible object storage. **[@unikvs/redis.node](/unikvs/en/packages/redis-node)** Store data in Redis. **[@unikvs/fs.bun](/unikvs/en/packages/fs-bun)** Store data in the Bun local filesystem. **[@unikvs/s3.bun](/unikvs/en/packages/s3-bun)** Store data in S3-compatible object storage with Bun. **[@unikvs/redis.bun](/unikvs/en/packages/redis-bun)** Store data in Redis using the Bun Redis client. **[@unikvs/valkey](/unikvs/en/packages/valkey)** Store data in Valkey. **[@unikvs/memcached](/unikvs/en/packages/memcached)** Store data in Memcached. **[@unikvs/etcd](/unikvs/en/packages/etcd)** Store data in etcd. **[@unikvs/cache-storage](/unikvs/en/packages/cache-storage)** Store data in the browser Cache Storage. **[@unikvs/cookies](/unikvs/en/packages/cookies)** Use cookies as a backend. **[@unikvs/cloudflare-kv](/unikvs/en/packages/cloudflare-kv)** Store data in Cloudflare KV. **[@unikvs/cloudflare-r2](/unikvs/en/packages/cloudflare-r2)** Store data in Cloudflare R2. **[@unikvs/cloudflare-cache](/unikvs/en/packages/cloudflare-cache)** Store data in the Cloudflare Cache API. **[@unikvs/vercel-blob](/unikvs/en/packages/vercel-blob)** Store data in Vercel Blob. **[@unikvs/vercel-runtime-cache](/unikvs/en/packages/vercel-runtime-cache)** Store data in the Vercel runtime cache. **[@unikvs/retry](/unikvs/en/packages/retry)** Wrapper that retries transient failures. **[@unikvs/soft-delete](/unikvs/en/packages/soft-delete)** Wrapper that treats deletes as soft deletes. ## Middleware [#middleware] Transparently transform values. Grouped by transformation. **[@unikvs/json](/unikvs/en/packages/json)** Convert values to JSON, and to JSON Lines for streams. **[@unikvs/superjson](/unikvs/en/packages/superjson)** Convert with SuperJSON, preserving Date, Map, Set, BigInt, and undefined. **[@unikvs/cbor](/unikvs/en/packages/cbor)** Convert values to CBOR, and to CBOR sequences for streams. **[@unikvs/v8-serde](/unikvs/en/packages/v8-serde)** Serialize fast with Node.js v8.serialize. **[@unikvs/base64](/unikvs/en/packages/base64)** Convert bytes to Base64 text. **[@unikvs/base64url](/unikvs/en/packages/base64url)** Convert bytes to URL-safe Base64url. **[@unikvs/hex](/unikvs/en/packages/hex)** Convert bytes to hexadecimal (Hex) strings. **[@unikvs/compression](/unikvs/en/packages/compression)** Compress and decompress with gzip, deflate, and deflate-raw. **[@unikvs/checksum](/unikvs/en/packages/checksum)** Verify MD5, SHA-1, SHA-224, SHA-256, SHA-384, and SHA-512. **[@unikvs/zstd.wasm](/unikvs/en/packages/zstd-wasm)** Compress and decompress with WASM zstd. **[@unikvs/zstd.node](/unikvs/en/packages/zstd-node)** Compress and decompress with Node.js zstd. **[@unikvs/zstd.bun](/unikvs/en/packages/zstd-bun)** Compress and decompress with Bun zstd. **[@unikvs/brotli.node](/unikvs/en/packages/brotli-node)** Compress and decompress with Node.js Brotli. **[@unikvs/brotli.bun](/unikvs/en/packages/brotli-bun)** Compress and decompress with Bun Brotli. **[@unikvs/brotli.wasm](/unikvs/en/packages/brotli-wasm)** Compress and decompress with WASM Brotli. ## Dev tools [#dev] Packages for observing and controlling behavior. **[@unikvs/debug](/unikvs/en/packages/debug)** Log read/write operations and data for debugging. **[@unikvs/passthrough](/unikvs/en/packages/passthrough)** Pass data through without transformation. **[@unikvs/tap](/unikvs/en/packages/tap)** Pass data through while invoking a callback with the context. **[@unikvs/allow-repair](/unikvs/en/packages/allow-repair)** Control whether read-repair write-backs are allowed. **[@unikvs/key-prefix](/unikvs/en/packages/key-prefix)** Prepend a fixed string to every key. **[@unikvs/writeonly](/unikvs/en/packages/writeonly)** Make an existing storage write-only. **[@unikvs/readonly](/unikvs/en/packages/readonly)** Make an existing storage read-only. **[@unikvs/expiry](/unikvs/en/packages/expiry)** Validate that values with expiry are still valid. **[@unikvs/ttl](/unikvs/en/packages/ttl)** Attach and manage TTLs on values. **[@unikvs/rate-limit](/unikvs/en/packages/rate-limit)** Limit operation frequency. **[@unikvs/metrics](/unikvs/en/packages/metrics)** Collect operation metrics. **[@unikvs/tracing](/unikvs/en/packages/tracing)** Record operation traces.