How can I pretty-print JSON using Go?

Does anyone know of a simple way to pretty-print JSON output in Go?

The stock http://golang.org/pkg/encoding/json/ package does not seem to include functionality for this (EDIT: it does, see accepted answer) and a quick google doesn’t turn up anything obvious.

Uses I’m looking for are both pretty-printing the result of json.Marshal and just formatting a string full of JSON from wherever, so it’s easier to read for debug purposes.

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