Extensions

An extension here means a command family beyond the core Redis keyspace types (strings, hashes, lists, sets, sorted sets, streams, and so on). FrogDB implements two kinds of extension family:

• Redis-Stack-compatible — the behavior is defined and documented upstream by redis.io / the Redis Stack module docs. FrogDB targets that behavior and documents only the deltas; it does not restate the upstream reference.
• FrogDB-original — no upstream documentation exists, so FrogDB is the canonical source and documents the family in full.

This page is an index: it tells you which families exist and where their canonical documentation lives. It does not list per-command support status. Whether a specific command is supported, partial, or unsupported lives in the generated Command matrix, which is built from the running command registry and therefore always matches the binary. Deltas from upstream behavior for the compatible families are on Compatibility → Overview & differences.

Redis-Stack-compatible families

For these families the upstream documentation is authoritative. Use the Command matrix to check command-level coverage — filter it by the family’s command prefix (for example JSON.).

Family	What it is	Canonical docs	Status
JSON (JSON.*)	Store, query, and update JSON values at a key	redis.io — JSON	Command matrix
Time Series (TS.*)	Time-series data with retention, downsampling, and aggregation	redis.io — Time Series	Command matrix
Search (FT.*)	Secondary indexing, full-text and vector query, and aggregation over hashes/JSON	redis.io — Search and query	Command matrix
Bloom filter (BF.*)	Probabilistic set membership (no false negatives)	redis.io — Bloom filter	Command matrix
Cuckoo filter (CF.*)	Probabilistic set membership with deletion support	redis.io — Cuckoo filter	Command matrix
Count-Min Sketch (CMS.*)	Probabilistic frequency counts over a stream of items	redis.io — Count-min sketch	Command matrix
Top-K (TOPK.*)	Probabilistic tracking of the most frequent items	redis.io — Top-K	Command matrix
t-digest (TDIGEST.*)	Probabilistic quantile/rank estimation over a distribution	redis.io — t-digest	Command matrix
Vector sets (VADD, VSIM, …)	Vector similarity sets; commands are unprefixed, matching Redis vector sets	redis.io — Vector sets	Command matrix

Vector set commands follow Redis’s own unprefixed naming (VADD, VSIM, VCARD, VDIM, VEMB, VGETATTR, VINFO, VLINKS, VRANDMEMBER, VRANGE, VREM, VSETATTR) rather than a single V.* prefix.

FrogDB-original families

These have no upstream documentation; FrogDB is the canonical source.

• Event Sourcing (ES.*) — event-sourcing primitives built on Redis Streams: optimistic concurrency control, version-based reads, snapshot-accelerated replay, idempotent appends, and a global $all stream. See the Event Sourcing reference for full per-command documentation.
• HOTKEYS — a FrogDB-original diagnostic command that samples frequently accessed keys. It is a diagnostic, not a data family; its home is Operations → Diagnostics. It is listed here only so readers scanning for FrogDB-original surface can find it.

Stream extensions XDELEX and XACKDEL also exist in FrogDB, but they are part of the upstream Redis stream command set for the targeted Redis version, not FrogDB-original. They appear in the Command matrix under the stream family alongside the other X* commands.

How to read extension status

The Command matrix is generated from the live command registry, so the extension-command coverage it shows is always in sync with the binary — a command that is registered appears there, and one that is not does not. To find a family, open the matrix and search or filter for its command prefix (JSON., TS., FT., BF., CF., CMS., TOPK., TDIGEST., ES.) or, for vector sets, the individual V* command names. Each command carries a supported / partial / unsupported badge and a short note.