MongrelDB, from the source.
Embedded native document and SQL-like workflows backed by the public MongrelDB crates — browsing, querying, schema, and migration integration, built into every Mongrel build.
Built into every Mongrel build · embedded · open-source crates
The pipeline MongrelDB runs for your query.
Click any stage below to see docs examined, timing, and what Mongrel would suggest. Same view you get inside the workbench.
// $filter · status: "paid"
Matches status = "paid" against the index range first. Selectivity 0.3% — 214 of 80,000 documents pass. Suggested index hint applied.
// orders · embedded store db.orders.query({ filter: { status: "paid", created_at: { $gt: "2026-06-01" } }, lookup: { from: "customers", on: "customer_id" }, sort: { created_at: -1 }, project: ["id", "total", "customer.email"], limit: 20 }); // 218ms → 7ms · was scanning 80,000 docs // ✓ Proposal: compound index (customer_id, created_at) db.orders.createIndex({ "customer_id": 1, "created_at": -1 });
What Mongrel ships for MongrelDB.
Document browser & editor
Browse collections as documents, edit nested JSON in place with type-aware fields, and save atomically.
Pipeline inspector
Step through every stage of a document query — docs examined, time, and index usage per stage.
SQL-like querying
Write familiar SELECT-style queries that translate to native document operations, and see the generated pipeline.
Index management
Create and drop single and compound indexes from the UI. See which queries each index actually serves.
Schema analysis
Sample collections to infer field shapes, spot missing keys and type drift, and generate a schema report.
Schema sync & migrations
Compare collections between environments and generate reversible migrations integrated with Mongrel's migration runner.
AI explain & rewrite
Paste a query and its pipeline stats. The assistant rewrites it, proposes an index hint, shows the predicted stats.
Built-in, zero setup
Backed by the public MongrelDB crates and embedded in every Mongrel build. No server, no credentials, no plugin to install.
Import, export, copy
JSON and BSON import/export. Copy documents between MongrelDB and any other engine — schema-aware.