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JSON:API Resource for Laravel

A lightweight API resource for Laravel that helps you adhere to the JSON:API standard with support for sparse fieldsets, compound documents, and more baked in.

Note These docs are not designed to introduce you to the JSON:API specification and the associated concepts, instead you should head over and read the specification if you are not yet familiar with it. The documentation that follows only covers how to implement the specification via the package.

Table of contents

• Installation
• Getting started
  • Creating your first JSON:API resource
  • Adding attributes
  • Adding relationships
• A note on eager loading
• Digging deeper
  • Attributes
    • toAttributes()
    • Sparse fieldsets
    • Minimal attributes
    • Lazy attribute evaluation
  • Relationships
    • toRelationships()
    • Customising the relationship resource class guessing

Installation

You can install using composer from Packagist.

Getting started

The JsonApiResource class provided by this package is a specialisation of Laravel's Eloquent API resource. All public facing APIs are still accessible; in a controller, for example, you interact with a JsonApiResource as you would with Laravel's JsonResource class.

As we make our way through the examples you will see that new APIs are introduced when interacting with the class internally, for example, the toArray() method is no longer used.

Creating your first JSON:API resource

To get started, let's create a UserResource for our User model. In our user resource will expose the user's name, website, and twitter_handle in the response.

First we will create a new API resource that extends TiMacDonald\JsonApi\JsonApiResource.

Adding attributes

We will now create an $attributes property and list the model's attributes we want to expose.

When making a request to an endpoint that returns the UserResource, for example:

The following JSON:API formatted data would be returned:

🎉 You have just created your first JSON:API resource 🎉

Congratulations...and what. a. rush!

We will now dive into adding relationships to your resources, but if you would like to explore more complex attribute features you may like to jump ahead:

• toAttributes()
• Sparse fieldsets
• Minimal attributes
• Lazy attribute evaluation

Adding relationships

Available relationships may be specified in a $relationships property, similar to the $attributes property, however you may use a key / value pair to provide the resource class that should be used for the given relationship.

We will make two relationships available on the resource:

• $user->team: a "toOne" / HasOne relationship.
• $user->posts: a "toMany" / HasMany relationship.

Assuming the key / value pair follows the convention '{myKey}' => {MyKey}Resource::class, the class may be omitted to streamline things further.

Example request and response

The client may now request these relationships via the include query parameter.

GET /users/74812?include=posts,team

Note Relationships are not exposed in the response unless they are requested by the calling client via the include query parameter. This is intended and is part of the JSON:API specification.

To learn about more complex relationship features you may like to jump ahead:

• toRelationships()
• Customising the relationship resource class guessing

A note on eager loading

This package does not eager load Eloquent relationships. If a relationship is not eagerly loaded, the package will lazy load the relationship on the fly. I highly recommend using Spatie's query builder package which will eager load your models against the JSON:API query parameter standards.

Spatie provide comprehensive documentation on how to use the package, but I will briefly give an example of how you might use this in a controller.

Digging deeper

We have now covered the basics of exposing attributes and relationships on your resources. We will now cover more advanced topics to give you even greater control.

Attributes

toAttributes()

As we saw in the adding attributes section, the $attributes property is the fastest way to expose attributes for a resource. In some scenarios you may need greater control over the attributes you are exposing. If that is the case, you may implement the toAttributes() method. This will grant you access to the current request and allow for conditional logic.

Example response

Sparse fieldsets

Sparse fieldsets are a feature of the JSON:API specification that allows clients to specify which attributes, for any given resource type, they would like to receive. This allows for more deterministic responses, while also improving server-side performance and reducing payload sizes. Sparse fieldsets work out of the box for your resources.

We will cover them briefly here, but we recommend reading the specification to learn more.

As an example, say we are building out an index page for a blog. The page will show each post's title and excerpt, and also the name of the post's author. If the client wishes, they may limit the response to only include the required attributes for each resource type, and exclude the other attributes, such as the post's content and the authors twitter_handle.

To achieve this we will send the following request.

Note The include query parameter key is author, while the sparse fieldset parameter key is users. This is because authors are users, e.g. the Eloquent author() relationship returns a User model.

Example response

Minimal attributes

Resources return a maximal attribute payload when sparse fieldsets are not in use i.e. all declared attributes on the resource are returned. If you prefer you can make the use of sparse fieldsets required in order to retrieve any attributes.

You may call the useMinimalAttributes() method in an application service provider.

Lazy attribute evaluation

For attributes that are expensive to calculate, it is possible to have them evaluated only when they are to be included in the response, i.e. they have not been excluded via minimal attributes. This may be useful if you are interacting with a database or making HTTP requests in a resource.

As an example, let's imagine that we expose a base64 encoded avatar for each user. Our implementation downloads the avatar from our in-house avatar microservice.

The above implementation would make a HTTP request to our microservice even when the client is excluding the avatar attribute via sparse fieldsets or minimal attributes. To improve performance when this attribute is not being returned we can wrap the value in a Closure. The Closure will only be evaluated when the avatar is to be returned.

Relationships

toRelationships()

As we saw in the adding relationships section, the $relationships property is the fastest way to specify the available relationships for a resource. In some scenarios you may need greater control over the relationships you are making available. If that is the case, you may implement the toRelationships() method. This will grant you access to the current request and allow for conditional logic.

The value must always be wrapped in a Closure, which will only be called if the relationships is requested by the client.

Customising the relationship resource class guessing

//----- Everything that follows is WIP and should be ignored ------- //

Resource Identification

[JSON:API docs: Identification](https://jsonapi.org/format/#document-resource-object-identification)

We have defined a sensible default for you so you can hit the ground running without having to fiddle with the small stuff.

The "id" and "type" of a resource is automatically resolved for you under-the-hood if you are using resources solely with Eloquent models.

"id" is resolved by calling the $model->getKey() method and the "type" is resolved by using a camel case of the model's table name, e.g. blog_posts becomes blogPosts.

You can customise how this works to support other types of objects and behaviours, but that will follow in the advanced usage section.

Nice. Well that was easy, so let's move onto...

Resource Links

[JSON:API docs: Links](https://jsonapi.org/format/#document-resource-object-links)

To provide links for a resource, you can implement the toLinks($request) method...

Resource Meta

[JSON:API docs: Meta](https://jsonapi.org/format/#document-meta)

To provide meta information for a resource, you can implement the toMeta($request) method...

Advanced usage

Resource Identification

Customising the resource "id"

You can customise the resolution of the id by specifying an id resolver in your service provider.

Although it is not recommended, you can also override the toId(Request $request): string method on a resource by resource basis.

Customising the resource "type"

You can customise the resolution of the type by specifying a type resolver in your service provider.

Although it is not recommended, you can also override the toType(Request $request): string method on a resource by resource basis.

Resource Relationships

[JSON:API docs: Inclusion of Related Resources](https://jsonapi.org/format/#fetching-includes)

Relationships can be resolved deeply and also multiple relationship paths can be included. Of course you should be careful about n+1 issues, which is why we recommend using this package in conjunction with Spatie's Query Builder.

• Using "whenLoaded is an anti-pattern"

Credits

• Tim MacDonald
• Jess Archer for co-creating our initial in-house version and the brainstorming
• All Contributors

And a special (vegi) thanks to Caneco for the logo ✨

v1 todo

• Server implementation rethink.
• Rethink naming of objects and properties
• Camel case everything
• Allow resources to specify their JsonResource class.
• Make all caches WeakMaps.
• Things that "must" need to be first in the __consstructor. See Links:href
• Should it be withResourceIdentifier or mapResourceIdentifier. Feel like we are mapping. or pipeResourceIdentifier
• Should all caches use weakmap with request key?