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The SPARQL 1.1 Query Language allows to query datasources of RDF triples. SPARQL.js translates SPARQL into JSON and back, so you can parse and build 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();
parsedQuery.variables = ['?mickey'];
var generatedQuery = generator.stringify(parsedQuery);
$ sparql-to-json query.sparql
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 in N3.js 0.x, but will switch to RDF/JS representation in the future.
$ [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.
FAQs
A parser for the SPARQL query language
The npm package sparqljs receives a total of 9,090 weekly downloads. As such, sparqljs popularity was classified as popular.
We found that sparqljs demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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