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Kysely (pronounce “Key-Seh-Lee”) is a type-safe and autocompletion-friendly typescript SQL query builder. Inspired by knex. Mainly developed for node.js but also runs on deno and in the browser. Kysely makes sure you only refer to tables and columns that are visible to the part of the query you're writing. The result type only has the selected columns with correct types and aliases. As an added bonus you get autocompletion for all that stuff. As shown in the gif above, through the pure magic of modern typescript, Kysely is even able to parse the alias given to pet.name and add the pet_name column to the result row type. Kysely is able to infer column names, aliases and types from selected subqueries, joined subqueries, with statements and pretty much anything you can think of. Of course there are cases where things cannot be typed at compile time, and Kysely offers escape hatches for these situations.
Features
- Kysely currently works on PostgreSQL, MySQL and SQLite
- All you need to do is define an interface for each table in the database and pass those interfaces to the Kysely constructor
- Generate the table types automatically from the database schema
- You can find examples of select queries in the documentation
- Stream select query results
- Migrations supported
Project Samples
