# musli-json
[
](https://github.com/udoprog/musli)
[
](https://crates.io/crates/musli-json)
[
](https://docs.rs/musli-json)
[
](https://github.com/udoprog/musli/actions?query=branch%3Amain)
JSON support for [Müsli] suitable for network and usually browser
communication.
JSON encoding is fully upgrade stable:
* ✔ Can tolerate missing fields if they are annotated with
`#[musli(default)]`.
* ✔ Can skip over unknown fields.
```rust
use musli::{Encode, Decode};
#[derive(Debug, PartialEq, Encode, Decode)]
struct Version1 {
name: String,
}
#[derive(Debug, PartialEq, Encode, Decode)]
struct Version2 {
name: String,
#[musli(default)]
age: Option,
}
let version2 = musli_json::to_vec(&Version2 {
name: String::from("Aristotle"),
age: Some(62),
})?;
let version1: Version1 = musli_json::from_slice(version2.as_slice())?;
assert_eq!(version1, Version1 {
name: String::from("Aristotle"),
});
```
[Müsli]: https://github.com/udoprog/musli