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Description:

japx

Flutter Japx - JSON:API Decoder/Encoder #

Lightweight [JSON:API][1] parser that flattens complex [JSON:API][1] structure and turns it into simple JSON and vice versa.
It works by transferring Map<String, dynamic> to Map<String, dynamic>, so you can use json_serializable or any other object mapping tool that you prefer.
Usage #
For decoding the API responses use function Japx.decode(Map<String, dynamic> jsonApi, {String includeList}) which returns flattened JSON.
Include list is an optional parameter and it is used for deserializing JSON:API relationships.
For encoding use function Japx.encode(Object json, {Map<String, dynamic> additionalParams}) which will return a JSON with JSON:API format.
Decoding #
Examples #
API response:
{
"data": {
"id": "1",
"type": "users",
"attributes": {
"email": "john@infinum.co",
"username": "john"
}
}
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will be transferred to this:
{
"data": {
"id": "1",
"type": "users",
"email": "john@infinum.co",
"username": "john"
}
}
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Advanced examples #
Parsing relationship
Response:
{
"data": [{
"type": "articles",
"id": "1",
"attributes": {
"title": "JSON API paints my bikeshed!",
"body": "The shortest article. Ever.",
"created": "2015-05-22T14:56:29.000Z",
"updated": "2015-05-22T14:56:28.000Z"
},
"relationships": {
"author": {
"data": {"id": "42", "type": "people"}
}
}
}],
"included": [
{
"type": "people",
"id": "42",
"attributes": {
"name": "John",
"age": 80,
"gender": "male"
}
}
]
}
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Parsed JSON:
{
"data": [{
"type": "articles",
"id": "1",
"title": "JSON API paints my bikeshed!",
"body": "The shortest article. Ever.",
"created": "2015-05-22T14:56:29.000Z",
"updated": "2015-05-22T14:56:28.000Z",
"author": {
"type": "people",
"id": "42",
"name": "John",
"age": 80,
"gender": "male"
}
}]
}
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Decoding additional info
Response:
{
"data": [
{
"type": "articles",
"id": "3",
"attributes": {
"title": "JSON API paints my bikeshed!",
"body": "The shortest article. Ever.",
"created": "2015-05-22T14:56:29.000Z",
"updated": "2015-05-22T14:56:28.000Z"
}
}
],
"meta": {
"total-pages": 13
},
"links": {
"self": "http://example.com/articles?page[number]=3&page[size]=1",
"first": "http://example.com/articles?page[number]=1&page[size]=1",
"prev": "http://example.com/articles?page[number]=2&page[size]=1",
"next": "http://example.com/articles?page[number]=4&page[size]=1",
"last": "http://example.com/articles?page[number]=13&page[size]=1"
},
"additional": {
"info": "My custom info"
}
}
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Parsed JSON:
{
"data": [
{
"type": "articles",
"id": "3",
"title": "JSON API paints my bikeshed!",
"body": "The shortest article. Ever.",
"created": "2015-05-22T14:56:29.000Z",
"updated": "2015-05-22T14:56:28.000Z"
}
],
"meta": {
"total-pages": 13
},
"links": {
"self": "http://example.com/articles?page[number]=3&page[size]=1",
"first": "http://example.com/articles?page[number]=1&page[size]=1",
"prev": "http://example.com/articles?page[number]=2&page[size]=1",
"next": "http://example.com/articles?page[number]=4&page[size]=1",
"last": "http://example.com/articles?page[number]=13&page[size]=1"
},
"additional": {
"info": "My custom info"
}
}
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Encoding #
Examples #
Basic encoding
Your JSON:
{
"type": "articles",
"email": "user@example.com",
"password": "password",
"push_token": "x",
"uuid": "123"
}
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JSON:API:
{
"data": {
"type": "articles",
"attributes": {
"email": "user@example.com",
"password": "password",
"push_token": "x",
"uuid": "123"
},
"relationships": {}
}
}
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Advanced Examples #
Recursive encoding
Your JSON:
{
"type": "articles",
"id": "1",
"title": "JSON API paints my bikeshed!",
"body": "The shortest article. Ever.",
"created": "2015-05-22T14:56:29.000Z",
"updated": "2015-05-22T14:56:28.000Z",
"author": {
"type": "people",
"id": "42",
"name": "John",
"age": 80,
"gender": "male",
"article": {
"type": "articles",
"id": "1",
"title": "JSON API paints my bikeshed!",
"body": "The shortest article. Ever.",
"created": "2015-05-22T14:56:29.000Z",
"updated": "2015-05-22T14:56:28.000Z",
"author": {
"type": "people",
"id": "42",
"name": "John",
"age": 80,
"gender": "male"
}
}
}
}
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Encode result:
{
"data": {
"type": "articles",
"id": "1",
"attributes": {
"title": "JSON API paints my bikeshed!",
"body": "The shortest article. Ever.",
"created": "2015-05-22T14:56:29.000Z",
"updated": "2015-05-22T14:56:28.000Z"
},
"relationships": {
"author": {
"data": {"id": "42", "type": "people"}
}
}
}
}
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Meta encoding
JSON with meta parameter:
{
"id" : "33",
"type" : "time_off_request",
"status" : "approved",
"start_date" : "2019-01-14",
"end_date" : "2019-01-31",
"policy" : [
{ "id": "24", "type": "time_off_policy", "meta": "TOP24" },
{ "id": "25", "type": "time_off_policy", "meta": "TOP25" }
],
"user" : {
"id" : "25",
"type" : "user",
"avatar" : "",
"email" : "user@email.com",
"name" : "user name",
"meta": {
"meta_user": "meta1",
"meta_user2": "meta2"
}
},
"meta": [
{ "page": 24 },
{ "offset": 24 }
]
}
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Result:
{
"data": {
"id": "33",
"type": "time_off_request",
"attributes": {
"status": "approved",
"start_date": "2019-01-14",
"end_date": "2019-01-31",
"meta": [
{ "page": 24 },
{ "offset": 24 }
]
},
"relationships": {
"user": {
"data": {
"id": "25",
"type": "user"
}
},
"policy": {
"data": [
{
"id": "24",
"type": "time_off_policy"
},
{
"id": "25",
"type": "time_off_policy"
}
]
}
}
}
}
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Example project #
Simple project with mocked API can be found in this repository. Clone the repository, set the main.dart as an application starting point and run the project.
Usage with JsonSerializable #
This package can be implemented as a simple layer into your exisiting stack. For example, if you use JsonSerializable, you can do it like this:
@JsonSerializable(nullable: false)
class Article {

factory Article.fromJson(Map<String, dynamic> json) => _$ArticleFromJson(Japx.decode(json));
Map<String, dynamic> toJson() => Japx.encode(_$ArticleToJson(this));
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Authors #
Vlaho Poluta, vlaho.poluta@infinum.com
Maroje Marcelic, maroje.marcelic@infinum.com
Maintained by Infinum
License #
Japx is available under the MIT license. See the LICENSE file for more info.