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json-rust. Parse and serialize JSON with ease.. Changelog-Complete Documentation - Cargo-Repository. Why? JSON is a very loose format where anything goes - arrays can hold mixed types, object keys can change types between API calls or not include some keys under some conditions. Browse other questions tagged rust state state-machine or ask your own question. The Overflow Blog Podcast 269: What tech is like in “Rest of World” Option has a wide variety of helper methods which can help here. You basically want to mutate the Vec that's already there if there is one, and if not, create one and mutate it. You can do that with Option::get_or_insert_with, which returns a &mut Vec<Attachment>. With that, you can push the item onto the end.