JetBrains/Exposed

Health v2 · maintenance only

Adoption not part of the score

9281 stars · 796 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Exposed is JetBrains' lightweight SQL library and ORM framework for Kotlin, offering a typesafe SQL-wrapping DSL and a lightweight DAO API on top of JDBC and R2DBC drivers. It is database-agnostic, supporting PostgreSQL, MySQL, MariaDB, Oracle, SQLite, H2, and more, with built-in Spring Boot and Ktor integration.

Use cases

• query a SQL database from Kotlin with type safety
• map database tables to Kotlin objects with an ORM
• write database-agnostic Kotlin code that can switch between PostgreSQL and MySQL
• build CRUD operations in a Ktor or Spring Boot backend
• construct SQL queries with a typesafe DSL instead of raw SQL strings
• use R2DBC for reactive database access in Kotlin

When to choose

• you are writing a Kotlin/JVM application that needs SQL database access
• you want compile-time-safe queries that survive refactoring and reduce SQL injection risk
• you want a lightweight ORM with both DSL and DAO styles
• you use Spring Boot or Ktor and want first-class integration

When to avoid

• you are not using Kotlin or the JVM
• you need a full-featured heavyweight ORM with advanced features like multi-level caching or complex lazy loading
• you work with databases outside the supported list (H2, MariaDB, MySQL, Oracle, PostgreSQL, SQLite)
• you prefer writing raw SQL or using a lightweight query builder without ORM concepts

Facets

library · maturity stable

orm database database-driver serialization databases backend web-development developer-tools jvm cross-platform kotlin sql dsl dao jdbc r2dbc spring-boot ktor database-agnostic

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