What era did Johann Sebastian bach write his music?

It was a passion of his and his life revolved around classical music. His father taught him to play violin and harpsichord.[4] His uncles were all professional musicians, whose posts ranged from...

Almost 1,200 compositions during his lifetime.

not many surprisingly, he only wrote the 6 brandenburg concertos, and the 4 orchestral suites

From the baroque era.

Baroque music. In the related links box below, I posted a good article about that.