Jsonapi-ts-deserializer NPM

JSON:API deserializer in Typescript

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A JSON:API response payload is a normalized set of entities and their relationships plus some metadata. This package deserializes a JSON:API response payload into an object graph, using user-defined entity deserializers to build the actual entities.

Installation

npm i jsonapi-ts-deserializer

Usage

import { getDeserializer, ItemDeserializer, RelationshipDeserializer } from 'jsonapi-ts-deserializer';

// Introduce types for your entities, the folder:
type Folder = {
    id: number;
    name: string;
    children: (Folder | File)[];
}

// and the file:
type File = {
    id: number;
    name: string;
}

// Create a deserializer for the folder:
const folderDeserializer : ItemDeserializer<Folder> = {
    type: 'folders',
    deserialize: (item: Item, relationshipDeserializer: RelationshipDeserializer): Folder => {
        const folder: Folder = {
            id: parseInt(item.id),
            name: item.attributes.name,
            children: [],
        };

        folder.children = relationshipDeserializer.deserializeRelationships(relationshipDeserializer, item, 'children');

        return folder;
    },
}

// ...and also for the file:
const fileDeserializer: ItemDeserializer<File> = {
    type: 'files',
    deserialize: (item: Item, relationshipDeserializer: RelationshipDeserializer): File => {
        return {
            id: parseInt(item.id),
            name: item.attributes.name,
        };
    }
}

// create the deserializer with the folder and file deserializers registered:
const deserializer = getDeserializer([
    folderDeserializer,
    fileDeserializer,
]);

// Fetch your JSON:API data:
const yourJsonData = fetch('https://api.example.com/api/folders');

// consume it and get the root items with the complete object-graph:
const rootItems: any[] = deserializer.consume(yourJsonData).getRootItems();

Please note that the deserializer only supports successful responses, and you will get an error if the response is not compatible with the JSON:API specification. I practise the response should be checked for errors before deserializing it and the error handling should be done separately.