How do you create geometry from an array of coordinates?

Hi,

I have array with geometry type and coordinates. How can I easily make geometry out of it? I could make a wkt text with string replace but I suspect it could be easier.

The string with geometry type and coordinates is (shortened):

{"type":"MultiPolygon","coordinates":[[[[155469.406,463438.624],[155469.253,463444.217],[155467.196,463444.174],[155467.077,463444.172],[155462.4]4,408. [ 155469.406,463438.624]]]]}