Joist

Key Features

Best-in-class Performance

All queries are optimized for Postgres, bulk INSERT and UPDATE for all writes, and batched SELECT for reads.

See performance for our high-level philosophy, and benchmarks for details.

N+1 Safe by Default

Bulletproof N+1 Preventation avoids N+1 query performance problems through batched loading and pre-loading.

Any loops written using Promise.all will never N+1, regardless of complexity.

Backend Reactivity

Reactive Fields and validation rules bring the ergonomics of declarative business logic to the backend.

Type-safe Domain Models

Robust Domain Modeling that leverages TypeScript for compile-time safety.

I.e. tracking relation loaded-ness in the type system.

Rich Test Support

Out-of-the-box test factories and fast test database resets make your tests succinct & resilient to change, even as your domain model evolves.

AI-Agent Ready

Joist auto-ships Agent Skills to help coding agents write idiomatic Joist code out-of-the-box, even in brand new repositories that don’t have established conventions for the agents to copy/paste.