Kysely vs TypeORM
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A type-safe TypeScript SQL query builder that checks your queries against your table types.
Open source · MIT
A TypeScript/JavaScript library that maps database tables to code objects for Node.js apps.
The short answer
Choose Kysely if you need…
- TypeScript developers who want SQL control without losing compile-time type checks
- Teams building Node.js backends that query PostgreSQL, MySQL, SQLite or MSSQL
- Developers who want editor autocompletion for table and column names
- Projects that need an escape hatch to raw SQL for cases the types cannot express
Choose TypeORM if you need…
- Node.js or TypeScript developers building apps backed by a relational database
- Teams that want one data layer that can switch between several database types
- Developers who want to choose between Active Record and Data Mapper styles
- Projects that need migrations, relations, and transactions handled by a library
Side-by-side
| Kysely | TypeORM | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 14.3k | 36.7k |
| Setup difficulty | Intermediate | Intermediate |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | TypeScript | TypeScript |
| Last code update | 4 days ago | 8 days ago |
What each one is
Kysely
Kysely is a library for writing SQL queries in TypeScript. You chain method calls instead of writing raw SQL strings, and TypeScript checks that the tables and columns you use exist and returns result types that match what you selected. It is inspired by Knex.js and is mainly aimed at Node.js, though the README says it also runs in Deno, Bun, Cloudflare Workers and browsers.
TypeORM
TypeORM is an ORM (object-relational mapper), a library that lets you work with database tables as classes and objects in TypeScript or JavaScript instead of writing raw SQL for every operation. It supports several databases, including PostgreSQL, MySQL, MariaDB, SQLite, SQL Server, and Oracle, and the README also lists MongoDB. It supports both the Active Record and Data Mapper styles.
Best for
Kysely
- TypeScript developers who want SQL control without losing compile-time type checks
- Teams building Node.js backends that query PostgreSQL, MySQL, SQLite or MSSQL
- Developers who want editor autocompletion for table and column names
- Projects that need an escape hatch to raw SQL for cases the types cannot express
TypeORM
- Node.js or TypeScript developers building apps backed by a relational database
- Teams that want one data layer that can switch between several database types
- Developers who want to choose between Active Record and Data Mapper styles
- Projects that need migrations, relations, and transactions handled by a library
Strengths
Kysely
- Type inference carries selected columns and aliases through queries, per the README
- API documentation is in the typing files and visible on hover in the IDE
- Supports several SQL dialects, including PostgreSQL, MySQL, SQLite and MSSQL
TypeORM
- Supports many databases with one API, according to the README
- Offers both Active Record and Data Mapper patterns
- Has a large community, with about 36,600 GitHub stars and an MIT license
Not ideal for
Kysely
- Developers not using TypeScript, since the main benefit depends on the type system
- People who want a full ORM with models, migrations and relationships handled for them, as Kysely is a query builder
- Beginners learning SQL for the first time, who may do better writing plain SQL first
TypeORM
- People who prefer writing raw SQL directly, since TypeORM adds an abstraction layer to learn
- Non-JavaScript projects, because the library is written for TypeScript and JavaScript runtimes
- Beginners with no database background, who should learn basic SQL concepts first
Trade-offs
Kysely
- Its value depends heavily on TypeScript, so JavaScript-only projects gain little
- The README notes some things cannot be typed at compile time and need escape hatches
- As a query builder, it does not provide ORM features such as models or relationship management
TypeORM
- The README is truncated, so detailed behavior and version compatibility are not fully covered here
- Supporting many databases and patterns adds size and complexity to learn
- Large projects may need careful configuration of migrations and multiple data sources
Getting started
TypeORM
Clone the repository
git clone https://github.com/typeorm/typeormFrequently asked questions
What is the difference between Kysely and TypeORM?
Kysely: A type-safe TypeScript SQL query builder that checks your queries against your table types. TypeORM: A TypeScript/JavaScript library that maps database tables to code objects for Node.js apps. Kysely suits typescript developers who want sql control without losing compile-time type checks, while TypeORM suits node.js or typescript developers building apps backed by a relational database.
Are Kysely and TypeORM free?
Kysely: Free and open source. TypeORM: Free and open source.
Is Kysely or TypeORM more popular?
TypeORM has more GitHub stars (36.7k) than Kysely (14.3k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to Kysely and TypeORM?
Other options people compare them with include Sequelize, knex, DuckDB, Turso, libSQL.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.