JSON:API-Client

JSON:API-Client is a JSON:API formatter and client in TypeScript with type safe sparse fieldsets and compound documents.

⚠️ This is an experimental branch, its implementation is not completed, not tested, and not production ready.

JSON:API Support

• [x] Sparse fieldsets
• [x] Compound documents
• [x] Search params (filter, page, sort)
• [x] CRUD operations on a resource
• [x] CRUD operations on a relationship
• [ ] Polymorphic relationships
• [ ] Polymorphic endpoints
• [ ] JSON:API document meta and links
• [ ] Resource object meta and links
• [ ] Resource relationship links
• [ ] Resource identifier meta

Design Goals

• Improve TS performance and type inference.
• Prevent resource fields and its type representation from going out of sync.
• Resource fields should support read/modify/write rules.
• Resource fields with a NeverGet flag should not be prevented to be included in a ResourceQuery
• Attribute fields should support data serialization.
• Relationships fields should support resources of more than one type.
• Resource query values should no longer be required to be cast as const.
• Resource include query values should only allow relationships that are present in its fields query.
• Includes mock tools (experimental)

Road Map

• Add support for polymorphic relationships and endpoints (maybe)
• Write specs
• Add integration tests
• Docs

Getting Started

Define a JSON:API Resource

A JSON:API resource is defined with ResourceFormatter, when a resource has a circular reference (i.e. a resource references itself directly or in one of its descendants) you will need to predefine the formatter type to prevent typescript going berserk. Because your model might change in the future it is recommended to always define your type to prevent seemingly random errors in the future.

For example:

type UserFormatter = ResourceFormatter<
  'User',
  {
    emailAddress: Attribute.Required<string>
    password: Attribute.RequiredWriteOnly<string>
    userName: Attribute.RequiredStatic<string>
    dateOfBirth: Attribute.Optional<string, Date>
    role: Attribute.RequiredReadOnly<'admin' | 'editor' | 'subscriber'>
    messages: Attribute.ToManyReadOnly<MessageResource>
    friends: Relationship.ToMany<UserResource>
  }
>

// An attribute field can use a type formatter to (de)serialize its values, for example to
// automatically convert an ISO8601 (date) string to a Date object back and forth.
const dateStringFormatter = {
  serialize: (value: Date) => value.toISOString(),
  deserialize: (value: string) => new Date(value),
}

// Type is an included composable assertion library to check values against their desired types.
const string = Type.is('a string', isString)
const userRole = Type.either('admin', 'editor', 'subscriber')

const user: UserFormatter = new ResourceFormatter('User', {
  emailAddress: Attribute.required(string),
  password: Attribute.requiredWriteOnly(string),
  userName: Attribute.requiredStatic(string),
  dateOfBirth: Attribute.optional(string, dateStringFormatter),
  role: Attribute.requiredReadOnly(userRole),
  messages: Relationship.toMany(() => message),
  friends: Relationship.toMany(() => user), // <- friends has a circular reference to user
})

Create a Client

const url = new URL('https://example.com/api/')

const client = new Client(url)

Create an Endpoint

const userPath = 'users'

const userEndpoint = client.endpoint(userPath, user)

Create a Resource

const myFirstUser = {
  emailAddress: '[email protected]',
  password: 'password1',
  userName: 'jane',
}

userEndpoint.create(myFirstUser).then((user) => {
  console.log(user.messages)
})

Update a Resource

const myFirstUserUpdate = {
  emailAddress: '[email protected]',
}

userEndpoint.update('1', myFirstUserUpdate)

Get a Single Resource Using a Filter

const userEmailFilter = user.createFilter({
  fields: {
    [user.type]: ['emailAddress', 'dateOfBirth'],
  },
})

userEndpoint.getOne('12', userEmailFilter).then((user) => {
  console.log(user)
  /* Resource { 
    type: 'User', 
    id: string,
    emailAddress: string,
    dateOfBirth: Date | null,
  }
  */
})

API (In Progress)

Resource

resource

(ResourceType, ResourceFields) -> ResourceFormatter

ResourceFormatter factory, returns a ResourceFormatter with methods to perform operations on (formatted) JSON:API data for this resource.

ResourceFormatter#identifier

(ResourceId) -> ResourceIdentifier

Create a ResourceIdentifier from the Resource static type and id parameter

ResourceFormatter#filter

(ResourceFieldsQuery, ResourceIncludeQuery) -> ResourceFilter

ResourceFormatter#decode

(JSONAPIDocument, ResourceFilter?) -> Resource

ResourceFormatter#createResourcePostObject

(ResourcePostData) -> JSONAPIResourceObject

ResourceFormatter#createResourcePatchObject

(ResourceId, ResourcePatchData) -> JSONAPIResourceObject

ResourceField

ResourceField#constructor

(ResourceFieldRoot, ResourceFieldFlag) -> ResourceField

ResourceField#matches

(ResourceFieldFlag) -> boolean

Attribute

Extends ResourceField

createAttributeFieldFactory

([ResourceFieldRule, ResourceFieldRule, ResourceFieldRule]) -> (Predicate, AttributeFieldFormatter) -> AttributeField<T, AttributeValue, ResourceFieldFlag>

Relationship

Extends ResourceField

createToOneRelationshipField

([ResourceFieldRule, ResourceFieldRule, ResourceFieldRule]) -> (Predicate, AttributeFieldFormatter) -> AttributeField<ResourceConstructor, RelationshipFieldType.ToOne, ResourceFieldFlag>

createToManyRelationshipField

([ResourceFieldRule, ResourceFieldRule, ResourceFieldRule]) -> (Predicate, AttributeFieldFormatter) -> AttributeField<ResourceConstructor, RelationshipFieldType.ToMany, ResourceFieldFlag>

Client

Client#constructor

(URL, ClientSetup) -> JSONAPIClient

Client#create

async (ResourceConstructor, ResourceCreateData) -> OneResource

Client#update

async (ResourceConstructor, ResourceId, ResourcePatchData) -> void

Client#delete

async (ResourceConstructor, ResourceId) -> void

Client#updateRelationship

async (ResourceConstructor, ResourceId, ToManyRelationshipNameWithFlag, RelationshipPatchData) -> void

Client#addRelationships

async (ResourceConstructor, ResourceId, ToManyRelationshipNameWithFlag, ToManyRelationshipPatchData) -> void

Client#deleteRelationships

async (ResourceConstructor, ResourceId, ToManyRelationshipNameWithFlag, ToManyRelationshipPatchData) -> void

Client#getOne

async (ResourceConstructor, ResourceId, ResourceQuery) -> OneResource

Client#getMany

async (ResourceConstructor, ClientQuery, ResourceQuery) -> ManyResource

Client#getOneRelationship

async (ResourceConstructor, ResourceId, ToManyRelationshipName, ResourceQuery) -> OneResource

Client#getManyRelationship

async (ResourceConstructor, ResourceId, ToManyRelationshipName, ResourceQuery) -> ManyResource

Client#one

(ResourceConstructor, ResourceQuery) -> (ResourceId) -> OneResource

Client#many

(ResourceConstructor, ResourceQuery) -> (ClientQuery) -> ManyResource

Client#toOne

(ResourceConstructor, ToOneRelationshipFieldNameWithFlag, ResourceQuery) -> (ResourceId) -> OneResource

Client#toMany

(ResourceConstructor, ToManyRelationshipFieldNameWithFlag, ResourceQuery) -> (ResourceId) -> ManyResource

OneResource

OneResource#constructor

(FilteredResource, JSONAPIMetaObject, JSONAPIResourceLinks) -> OneResource

ManyResource

ManyResource#constructor

(FilteredResource[], JSONAPIMetaObject, JSONAPIResourceLinks & JSONAPIPaginationLinks) -> ManyResource