sparql-http-client

SPARQL client for easier handling of SPARQL Queries and Graph Store requests. The SPARQL Protocol is used for SPARQL Queries and SPARQL Updates. The SPARQL Graph Store Protocol is used to manage Named Graphs.

Getting started example

TL;DR; the package exports a StreamClient class which run SPARQL queries on an endpoint.

const SparqlClient = require('sparql-http-client')

const endpointUrl = 'https://query.wikidata.org/sparql'
const query = `
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX p: <http://www.wikidata.org/prop/>
PREFIX ps: <http://www.wikidata.org/prop/statement/>
PREFIX pq: <http://www.wikidata.org/prop/qualifier/>

SELECT ?value WHERE {
  wd:Q243 p:P2048 ?height.

  ?height pq:P518 wd:Q24192182;
    ps:P2048 ?value .
}`

const client = new SparqlClient({ endpointUrl })
const stream = await client.query.select(query)

stream.on('data', row => {
  Object.entries(row).forEach(([key, value]) => {
    console.log(`${key}: ${value.value} (${value.termType})`)
  })
})

stream.on('error', err => {
  console.error(err)
})

Find more details on https://zazuko.github.io/sparql-http-client