SPARQL Endpoint for GraphQL-LD

This is a GraphQL-LD engine for executing queries against a remote SPARQL endpoint.

Usage

import {Client} from "graphql-ld";
import {QueryEngineSparqlEndpoint} from "graphql-ld-sparqlendpoint";

// Define a JSON-LD context
const context = {
  "@context": {
    "label": { "@id": "http://www.w3.org/2000/01/rdf-schema#label" }
  }
};

// Create a GraphQL-LD client based on a SPARQL endpoint
const endpoint = 'http://dbpedia.org/sparql';
const client = new Client({ context, queryEngine: new QueryEngineSparqlEndpoint(endpoint) });

// Define a query
const query = `
  query @single {
    label
  }`;

// Execute the query
const { data } = await client.query({ query });

Command-line usage

If you install this package globally (yarn global add graphql-ld-sparqlendpoint), then you'll have access to the graphql-ld-sparqlendpoint script to execute GraphQL-LD queries from the command-line as follows:

Query based on context and query strings:

$ graphql-ld-sparqlendpoint '{ "hero": "http://example.org/hero", "name": "http://example.org/name" }' '{ hero { name } }' http://dbpedia.org/sparql

Query based on context and query files:

$ graphql-ld-sparqlendpoint context.json query.txt http://dbpedia.org/sparql

License

This software is written by Ruben Taelman.

This code is released under the MIT license.