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# json 🐑
Work with JSON in Gleam!
Under the hood library uses [Thoas](https://github.com/lpil/thoas/), the fastest
and most memory efficient pure Erlang JSON encoder/decoder.
## Installation
Add this package to your Gleam project.
```shell
gleam add gleam_json
```
### Encoding
```rust
import myapp.{Cat}
import gleam/json.{object, string, mapped_array, int, null}
pub fn cat_to_json(cat: Cat) -> String {
object([
#("name", string(cat.name)),
#("lives", int(cat.lives),
#("flaws", null()),
#("nicknames", mapped_array(cat.nicknames, of: string)),
])
|> json.to_string
}
```
### Decoding
JSON is decoded into a `Dynamic` value which can be decoded using the
`gleam/dynamic` module from the Gleam standard library.
```rust
import myapp.{Cat}
import gleam/json
import gleam/dynamic.{field, list, int, string}
pub fn cat_from_json(json_string: String) -> Result(Cat, json.DecodeError) {
let cat_decoder = dynamic.decode3(
Cat,
field("name", of: string),
field("lives", of: int),
field("nicknames", of: list(string)),
)
json.decode(from: json_string, using: cat_decoder)
}
```
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