Playground

A real database, running in this tab

Not a recording and not a hosted sandbox — an actual LibreDB store opened inside your browser, persisted to OPFS. It is seeded with three namespaces on first load. Nothing you type leaves the machine.

playground.libredb — local, in this browser

Runs entirely in your browser · no backend · no signup

Cheatsheet

Click a command to load it into the editor, then press Run.

LibreDB is an ordered key–value store. Tables and collections are conventions over keys (users:1) — all operated with the same five verbs.

users:* relational table

A relational row keeps its primary key both in the key (users:4) and as its id column.

articles:* document collection

config:* key–value

Manage admin

List namespaces, their kind, and relational schemas (reads the catalog).
One-glance summary: file size on disk + namespace counts by kind.
Bulk-load many keys (here a new session:* namespace) in one atomic commit.

Persistence is per browser. Writes survive a reload through OPFS. A second tab cannot take the lock, so it falls back to in-memory and says so.
Five verbs, one grammar. get, put, delete, prefix and range — the same commands Studio's LibreDB provider issues. Tables and collections are conventions over the keyspace.
Reset wipes it. The reset button asks twice, then rebuilds the seed from scratch.

This is the embedded engine, not the IDE. To drive Postgres, MySQL or Mongo through the full Studio, open the live demo ↗ or deploy your own.