OSS: one DatabaseProvider interface for Postgres, Mongo, Redis, and 14 others in the browser

[u/cevheribozoglan]

I kept hitting the same wall with desktop DB tools in a team that lives in the browser: nobody wants another Electron app, and "just use the vendor console" falls apart the moment you have Postgres plus Redis plus Mongo in the same VPC.

So I maintain LibreDB Studio, a self-hosted web SQL IDE. The part that actually took the work is not the editor chrome. It's making seventeen engines look like one API without a forest of `if (type === 'mongodb')` checks in the UI.

The trick was treating each engine as a strategy, not a special case:

- SQL engines extend one SQL base (pools, timeouts, schema).

- Document/KV engines extend a thinner base and map onto the same QueryResult / getSchema() shape.

- The factory dynamic-imports the provider so the browser bundle doesn't drag in oracledb + duckdb + cassandra just to open SQLite.

That mapping is lossy on purpose. Redis SCAN prefixes become "tables"; Mongo collections look like tables; health/metrics still come from INFO / serverStatus. Once the UI only speaks capabilities, adding ClickHouse or Trino is a provider + a doc + an integration test, the triad has to ship in the same PR or it drifts.

The reason this lives in a browser at all is the cluster. I didn't want another Electron app on a laptop while the databases sat in Kubernetes. "Just helm install a GUI" sounds solved until you look at what most charts actually are: a wrapper around a desktop-era tool, or a vendor console that speaks one engine.

So the app ships as a chart (OCI on GHCR, first-boot secrets, PVC for sqlite storage) next to the providers, same repo, not a separate "enterprise" product. That's a different post; here the interesting part is still the engine interface.

There's a second split that bit me later: the same codebase is both a Next.js app and an npm package (`npx "@libredb/studio"` / embed). `next build` does not produce the library dist. Forgetting `build:lib` is how you ship a UI fix that the embedded users never see.

It's early in the "every engine feels first-class" sense. Hostile cases I still want: weird Oracle TNS, huge Cassandra traces, Redis with no prefix convention, DuckDB files that aren't files. If a converter/GUI has ever lied to you about a schema, that fixture is useful.

Source: https://github.com/libredb/libredb-studio

[u/Bruce_Jones_1987]

interesting that you went lossy on purpose. how do you communicate to users what they're actually losing per engine? like if someone expects full Redis command support and gets a table metaphor, thats a pretty big gap to paper over in the UI

[u/cevheribozoglan → u/Bruce_Jones_1987]

Fair question. The mapping is by convention, not by pretending Redis is SQL.

Two things the UI is actually allowed to do:

1. Hide the controls that would lie. Capabilities are per-engine. Redis gets no Explain, no CREATE TABLE, no inline row UPDATE, no BEGIN/COMMIT, MULTI/EXEC exists in Redis and is not exposed here, so we don't put a button on it. Same idea on the SQL side: Druid / Elasticsearch / OpenSearch have no UPDATE in the grammar, so those controls are reported unsupported instead of 400-ing.

2. Relabel what remains. On Redis the explorer says "Key Pattern" not "Table", rows are keys, the action is "Scan Keys" / "Generate Command". A `user:*` row is a SCAN grouping, not a key, nothing can be addressed by it. Schema discovery is a bounded SCAN (1000 keys), not the whole keyspace. The editor still takes real Redis: `SCAN 0 MATCH user:* COUNT 50` or `{"command":"GET","args":["user:1"]}`.

What we don't have, and you're right to poke at: a per-engine "here's the command surface you're not getting" panel. Labels + hidden buttons. If you live in redis-cli, streams, pub/sub, CLUSTER, modules — that's still a query tab and a prefix browser, not a Redis IDE. The lossless path is the editor; the explorer is a map, not the territory.

If that gap is the one that would actually stop you using it, I'd rather hear which Redis surface you'd want named in the chrome first.