CODEWITHSUNDEEP
jsonreasonbucklescript
Rotareti
Rotareti

Reputation: 53803

Decoding a JSON array of objects

Let's say I have this JSON array of objects:

[
  {"name": "foo", "tags": ["bird", "animal"], "age": 10},
  {"name": "bar", "tags": ["dog", "animal"], "age": 5},
  {"name": "baz", "tags": ["cat", "animal"], "age": 3}
]

How can I decode this in ReasonML?

Upvotes: 1

Views: 771

Answers (1)

glennsl
glennsl

Reputation: 29106

Using bs-json to decode it into an array of records:

let data = {|[
  {"name": "foo", "tags": ["bird", "animal"], "age": 10},
  {"name": "bar", "tags": ["dog", "animal"], "age": 5},
  {"name": "baz", "tags": ["cat", "animal"], "age": 3}
]|};

type t = {
  name: string,
  tags: array(string),
  age: int
};

module Decode = {
  let item = json =>
    Json.Decode.{
      name: json |> field("name", string),
      tags: json |> field("tags", array(string)),
      age:  json |> field("age", int)
    };

  let all =
    Json.Decode.array(item)
};

let result: array(t) =
  data |> Json.parseOrRaise
       |> Decode.all;

Upvotes: 6

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