Using the Serde library to read & write JSON.
$ cargo run
...The output:
jmsdnns loves listening to Amon Tobin, Fiona Apple, Mars Volta, Dave Brubeck, Anfisa Letyago
jmsdnns also has 7 guitars
JSON:
{"username":"jmsdnns","name":"Jms Dnns","top_artists":["Amon Tobin","Fiona Apple","Mars Volta","Dave Brubeck","Anfisa Letyago"],"guitars":5,"drumsets":2}