Microsoft SQL Server Client for Node.js

mssql is a robust and actively maintained Node.js client for Microsoft SQL Server, currently stable at version 12.3.1. It features a rapid release cadence, with multiple minor and patch versions frequently released, often within weeks, and major versions roughly annually. The library supports multiple underlying TDS drivers: the pure JavaScript `Tedious` driver (default) and the native `MSNodeSQLv8` driver, offering flexibility based on deployment environment and performance needs. It provides a modern API with support for async/await, Promises, ES6 tagged template literals, and streaming, alongside traditional callbacks. Key differentiators include its comprehensive API for managing connections, connection pools, and requests, as well as explicit support for SQL Server features like input/output parameters, stored procedure execution, and bulk inserts.