Nest-jsonapi NPM

Installation

npm install --save nest-jsonapi

Usage

Import the JsonapiModule into the root AppModule and use the forRoot() method to configure it:

import { JsonapiModule } from "nest-jsonapi";

@Module({
    imports: [
        JsonapiModule.forRoot({
            // options
        }),
    ],
})
export class AppModule {}

Inject JsonapiService:

import { JsonapiService, JSONAPI_MODULE_SERVICE } from "nest-jsonapi";

@Controller("photos")
export class PhotosController {
    constructor(@Inject(JSONAPI_MODULE_SERVICE) private readonly jsonapiService: JsonapiService) {}
}

Note that JsonapiModule is a global module, therefore it will be available in all modules.

Middleware

If you plan on using the JsonapiPayload decorator (more info below), you must use the JsonapiMiddleware in your application. This does 2 things:

enable parsing jsonapi content as JSON
creates a request-scoped holder for tracking metadata

e.g.

export class AppModule implements NestModule {
    public configure(consumer: MiddlewareConsumer): void {
        consumer.apply(JsonapiMiddleware).forRoutes(PhotosController);
    }
}

Interceptor

The JsonapiInterceptor is used to properly transform your controller result data to JSONAPI. You can decorate at a class or method level:

@UseInterceptors(JsonapiInterceptor)
@Controller("photos")
export default class PhotosController {}

Payload Metadata

In order for the JsonapiInterceptor to know how to transform your data, you need to decorate your methods.

@JsonapiPayload({ resource: RESOURCE_PHOTOS })
@Get()
public async findPhotos(@Query() query: FindOptions): Promise<Photo[]>

Exception Filter

In order to support error responses compliant with the JSONAPI specification, the JsonapiExceptionFilter exists.

const { httpAdapter } = app.get(HttpAdapterHost);
app.useGlobalFilters(new JsonapiExceptionFilter(httpAdapter));

Schema Registration

The JsonapiService requires schemas for the resources it is going to handle. You have control of how that is configured, by defining a schematic. We provide a thin wrapper around the transformalizer library.

Typically you will want to register your schemas on module initialization.

export class AppModule implements OnModuleInit {
    constructor(@Inject(JSONAPI_MODULE_SERVICE) private readonly jsonapiService: JsonapiService) {}

    public async onModuleInit(): Promise<void> {
        const photoBuilder = new SchemaBuilder<Photo>(RESOURCE_PHOTOS);
        photoBuilder.dataBuilder.untransformAttributes({ deny: ["createdAt", "updatedAt"] });
        this.jsonapiService.register(photoBuilder);
    }
}

Reference Example

nest-jsonapi-example is an example project that demonstrates the usage of this module. Since not all aspects of the module have been fully tested yet (coming soon!), I highly suggest checking this out!