1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
# json 🐑
Work with JSON in Gleam!
## Installation
Erlang/OTP 27.0 or higher is required when targeting Erlang.
To use earlier versions of Erlang/OTP use version 1.0.1 of
this package.
Add this package to your Gleam project.
```shell
gleam add gleam_json
```
### Encoding
```gleam
import myapp.{type Cat}
import gleam/json.{object, string, array, int, null}
pub fn cat_to_json(cat: Cat) -> String {
object([
#("name", string(cat.name)),
#("lives", int(cat.lives)),
#("flaws", null()),
#("nicknames", 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.
```gleam
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)
}
```
|
