Best free simple Javascript/Node.js library for charting live data from MS-SQL

  charts, javascript, node.js, sql-server

I am creating a page using Node.js and Javascript for presenting real-time live data charts stored in MS-SQL. Which light-weighted, fast, free yet flexible Javascript library for commercial use?
I used Flot for years, my previous code was ASP and it had many Database calls, so we decide to come up with a new solution.
p.s. I can re-design database to create a specific table if it helps; thank you.

Source: Ask Javascript Questions