Kysely review
A free, open-source SQL builder for TypeScript teams that want static query typing.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Kysely is an open-source TypeScript SQL query builder for developers building applications around relational databases. It suits teams that want SQL expressed through a fluent API while using a typed schema to get autocomplete, inferred result types, and compile-time checks for invalid table or column references. Its free, self-hosted model can fit projects from solo development through enterprise use, provided the team is comfortable working in TypeScript.
Database coverage is one of its practical strengths: built-in dialects support PostgreSQL, MySQL, Microsoft SQL Server, SQLite, and PGlite, while a community-supported dialect system extends the options. Kysely can compile queries without a database driver, which can be useful where query construction and execution need to remain separate. The API covers CRUD operations, joins, subqueries, set operations, common table expressions, transactions, and data definition language queries. Raw SQL remains available through a template tag, so teams can step outside the fluent builder when needed.
Kysely is a focused library rather than a hosted database service: deployment is self-hosted, and support comes through documentation and the community. Its type-safety model depends on a typed database schema and is aimed specifically at TypeScript, so it is a poor fit for teams seeking a language-agnostic tool or managed support channel. Choose it when compile-time query checks, SQL composition, and driver-independent compilation matter; consider another approach if your priority is a managed interface or a built-in dialect beyond its five listed options.
Kysely pros and cons
- Where it wins
- Infers result types and catches invalid table or column references at compile time
- Built-in dialects cover PostgreSQL, MySQL, SQL Server, SQLite, and PGlite
- Supports CTEs, transactions, schema queries, plugins, and raw SQL
- Where it doesn't
- Focused on TypeScript rather than a language-neutral query API
- Only five database dialects are built in; others rely on community support
- Self-hosted and supported through documentation and community channels
Kysely fact sheet, pricing and score →
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