Roadmap
Planned
WASI target
A wasm32-wasip1 build of wasm-edge for Cloudflare Workers and Deno Deploy. This would allow the Recached WASM module to run at the edge as a cache layer between origin and CDN, with the same API as the browser client.
The core-engine crate is already wasm32-compatible. The main work is adapting the WebSocket and persistence layers for the WASI environment.
Native JSON type
JSET key path value, JGET key path, JMERGE key patch. JSONPath-based access to nested JSON structures stored as a native type, without RedisJSON. This avoids the serialize-deserialize overhead for complex objects where only a part of the document changes frequently.
Rate-limiting commands
RLSET key limit window / RLCHECK key. A built-in sliding-window rate limiter that replaces hand-rolled INCR+EXPIRE or Lua script approaches. The window is stored as a sorted set internally; the API is a single command.
WASM server-side scripting
Run .wasm stored procedures in place of Lua scripts. The scripting VM would be sandboxed (no network, no file I/O, bounded execution time), accept any WASM module that exports a specific entry function, and execute it against the cache store. This supports any language that compiles to WASM: Rust, Go (TinyGo), AssemblyScript, Python (via Pyodide).
Intentionally out of scope
These features will not be added to Recached. If you need them, Redis is the right tool.
RDB / AOF persistence. Recached is an in-memory cache. Durability is the responsibility of the database behind it. Repopulate on startup from your source of truth.
REPLICAOF / leader-follower replication. The native→browser WebSocket sync is Recached's replication story. Multi-server Redis-style replication does not fit the architecture.
Full Redis command parity. Recached implements ~80 commands — the ones most applications actually use. The remaining 170+ Redis commands include cluster management, server introspection (INFO, SLOWLOG, DEBUG), and commands that assume RDB persistence (BGSAVE, BGREWRITEAOF, SAVE). These are not planned.
RESP3. RESP2 is sufficient for Recached's scope and keeps the parser simple. RESP3 adds type hints that matter more for complex Redis use cases than for Recached's.
Cluster mode. Recached is a single-node cache server. Horizontal scaling is not a goal for the current architecture.
Lua scripting. WASM scripting (see roadmap above) is the planned scripting story. Lua will not be added.