Function serde_json::to_writer_pretty

pub fn to_writer_pretty<W: ?Sized, T: ?Sized>(writer: &mut W,
                                              value: &T)
                                              -> Result<()> where W: Write, T: Serialize

Serialize the given data structure as pretty-printed JSON into the IO stream.

Serialization can fail if T's implementation of Serialize decides to fail, or if T contains a map with non-string keys.