The SPARQL 1.1 Query Language allows to query datasources of RDF triples. SPARQL.js translates SPARQL into a JSON structure, so you can use SPARQL queries in your JavaScript applications.

It fully supports the SPARQL 1.1 specification, including property paths, federation, and updates.

// Parse a SPARQL query to a JSON object
var SparqlParser = require('sparqljs').Parser;
var parser = new SparqlParser();
var parsedQuery = parser.parse(
  'PREFIX foaf: <http://xmlns.com/foaf/0.1/> ' +
  'SELECT * { ?mickey foaf:name "Mickey Mouse"@en; foaf:knows ?other. }');

// Regenerate a SPARQL query from a JSON object
var SparqlGenerator = require('sparqljs').Generator;
var generator = new SparqlGenerator();
query.variables = ['?mickey'];
var generatedQuery = generator.stringify(query);

$ sparql-to-json query.sparql

Through browserify:

$ cd SPARQL.js
$ npm install
$ browserify sparql.js --standalone sparqljs > sparqljs-browser.js
$ uglifyjs sparqljs-browser.js -c -m > sparqljs-browser-min.js

Queries are represented in a JSON structure. The most easy way to get acquainted with this structure is to try the examples in the queries folder through sparql-to-json. All examples of the SPARQL 1.1 specification have been included, in case you wonder how a specific syntactical construct is represented.

Here is a simple query in SPARQL:

PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
SELECT ?p ?c WHERE {
    ?p a dbpedia-owl:Artist.
    ?p dbpedia-owl:birthPlace ?c.
    ?c <http://xmlns.com/foaf/0.1/name> "York"@en.
}

And here is the same query in JSON:

{
  "type": "query",
  "prefixes": {
    "dbpedia-owl": "http://dbpedia.org/ontology/"
  },
  "queryType": "SELECT",
  "variables": [ "?p", "?c" ],
  "where": [
    {
      "type": "bgp",
      "triples": [
        {
          "subject": "?p",
          "predicate": "http://www.w3.org/1999/02/22-rdf-syntax-ns#type",
          "object": "http://dbpedia.org/ontology/Artist"
        },
        {
          "subject": "?p",
          "predicate": "http://dbpedia.org/ontology/birthPlace",
          "object": "?c"
        },
        {
          "subject": "?c",
          "predicate": "http://xmlns.com/foaf/0.1/name",
          "object": "\"York\"@en"
        }
      ]
    }
  ]
}

The representation of triples is the same as that of the N3.js library.

$ [sudo] npm [-g] install sparqljs

The SPARQL.js library is copyrighted by Ruben Verborgh and released under the MIT License.

Contributions are welcome, and bug reports or pull requests are always helpful.

• Thanks to Tim Ermilov for driving the SPARQL generator