Knex.js
Knex.js is a SQL query builder for Node.js that provides a flexible, chainable interface for constructing database queries. It supports multiple SQL dialects including PostgreSQL, MySQL, SQLite3, and Oracle, and includes features for schema migrations and seeding. It serves as a middle layer between raw SQL and higher-level ORMs, offering both convenience and control.
Developers should use Knex.js when building Node.js applications that require direct SQL access with cleaner syntax than raw queries, especially for complex queries or multi-database support. It's ideal for projects needing migrations (e.g., team-based web apps) or when transitioning from raw SQL to an ORM, as it reduces boilerplate and prevents SQL injection through parameter binding.