Saving an Array of Objects to MYSQL Database, and Retrieving It

How do i save an array of objects, like this: [{n:1,bb:4},{n:2,bb:4,r:1},{n:6,bb:7},…] to a database? I was thinking i would have to convert it to string, but if i do that, when i retrieve it from the database, how am i going to use it?

EDIT: forgot to mention that the objects can contain an array of objects as well, but there won’t be any more arrays beyond that point.

[{n:1,bb:4},{n:2,bb:4,r:1},{n:6,bb:7},{arr:[{a:11,b:2},{a:11,b:2},…],r:1},…]