JSON:API Kotlin

Kotlin module for mapping JSON response, in the format of JSON:API to objects.

Made specifically for Kotlin Multiplatform Mobile (KMM).

Installation

Following Working with the Gradle registry docs:

• Add GitHub Packages repository to the root project build.gradle.kts at allprojects block.

  allprojects {
      repositories {
          ...
          maven {
             name = "Github Packages"
             url = uri("https://maven.pkg.github.com/nimblehq/jsonapi-kotlin")
             credentials {
                 username = GITHUB_USER
                 password = GITHUB_TOKEN
             }
          }
      }
  }
  

  • GITHUB_USER: the developer's GitHub user to access GitHub Packages.
  • GITHUB_TOKEN: the developer's GitHub personal access token with at least packages:read permission.

• Open build.gradle.kts of shared module, or any KMM module that will use the library.

  kotlin {
      sourceSets {
          val commonMain by getting {
              dependencies {
                  implementation("co.nimblehq.jsonapi:core:${LATEST_VERSION}")
              }
          }
          ...
      }
      ...
  }
  

Usage

• Use with kotlinx.serialization.json.Json. Call decodeFromJsonApiString to map string to object.

  @Serializable
  data class ExampleModel(val title: String)
  val body = """
  {
    "data": {
      "type": "articles",
      "id": "1",
      "attributes": {
        "title": "JSON:API paints my bikeshed!"
      }
    }
  }
  """
  val json = Json {
       prettyPrint = true
       isLenient = true
       ignoreUnknownKeys = true
   }
  val data = JsonApi(json).decodeFromJsonApiString<ExampleModel>(body)
  

Features

JSON:API

This library maps JSON response, in the format of JSON:API.

val 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",
      "item_version": 2
    }
  }
}
"""

@Serializable
data class NetworkMockModel(
    val title: String,
    val body: String,
    val created: String,
    val updated: String,
    @SerialName("item_version")
    val itemVersion: Int
)

val data = JsonApi(Json).decodeFromJsonApiString<NetworkMockModel>(response)

Error

Returns error if object failed to map or the API returns error

val response = """
{
  "errors": [
    {
      "source": { "pointer": "" },
      "detail":  "Missing `data` Member at document's top level."
    }
  ]
}
"""

try {
    val data = JsonApi(Json).decodeFromJsonApiString<NetworkMockModel>(response)
} catch (e: JsonApiException) {
    return e.errors.first().detail // Missing `data` Member at document's top level.
}

Array

val 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",
      "item_version": 2
    }
  }]
}
"""

@Serializable
data class NetworkMockModel(
    val title: String,
    val body: String,
    val created: String,
    val updated: String,
    @SerialName("item_version")
    val itemVersion: Int
)

val data = JsonApi(Json).decodeFromJsonApiString<List<NetworkMockModel>>(response)

Relationship & Included

included object will be mapped by relationships type.

val 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"
      }
    }
  ]
}
"""

@Serializable
data class NetworkIncludedMockModel(
    val title: String,
    val body: String,
    val created: String,
    val updated: String,
    val author: People
)

val data = JsonApi(Json).decodeFromJsonApiString<NetworkIncludedMockModel>(response)

Array Included

val 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"
      }
    }
  ]
}
"""

@Serializable
data class NetworkIncludedMockModel(
    val title: String,
    val body: String,
    val created: String,
    val updated: String,
    val author: People
)

val data = JsonApi(Json).decodeFromJsonApiString<List<NetworkIncludedMockModel>>(response)

Only Meta

When mapping response with only meta and no data, pass the meta object as the resource type.

val response = """
{
  "meta": {
    "message": "Success"
  }
}
""".trimIndent()

@Serializable
data class NetworkOnlyMetaMockModel(
    val message: String
)

val data = JsonApi(Json).decodeFromJsonApiString<NetworkOnlyMetaMockModel>(response)

Meta

Use decodeWithMetaFromJsonApiString instead of decodeFromJsonApiString to get meta along with object.

val 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",
      "item_version": 2
    }
  }],
  "meta": {
    "page": 2,
    "totalPages": 13
  }
}
"""

@Serializable
data class NetworkMockModel(
    val title: String,
    val body: String,
    val created: String,
    val updated: String,
    @SerialName("item_version")
    val itemVersion: Int
)
@Serializable
data class NetworkMetaMockModel(
    val page: Int,
    val totalPages: Int
)

val data = JsonApi(Json)
  .decodeWithMetaFromJsonApiString<List<NetworkMockModel>, NetworkMetaMockModel>(
    response
  )

decodeWithMetaFromJsonApiString works with single, array, and included, same as decodeFromJsonApiString.

License

This project is Copyright (c) 2014 and onwards Nimble. It is free software and may be redistributed under the terms specified in the LICENSE file.

About

This project is maintained and funded by Nimble.

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