A pure javascript implementation of the hexatore RDF triple store, also useful as a graph database. Works in any browser with browserify or webpack. Early development, API is subject to changes.

Hexastore is based on this research paper. It is a way to structure RDF data such that queries are really fast. However, as implemented here, it has a 6 fold increase in memory usage as compared to a naive implementation of a triple store.

Its pure JS, so nothing fancy, just:

npm install hexastore

Just require Hexastore

var Hexastore = require('Hexastore');

And then you can start creating stores everywhere !

var mydb = new Hexastore();

To add a single triple

mydb.put(["hexastore","is","awesome"]);

To add a collection of triples

mydb.putAll([
    ["hexastore","is","nice"],
    ["hexastore","speed","fast"],
    ["javascript","is","nice"]
  ]);

To add triples represented as nested JS objects

mydb.addSPO({
    hexastore:{is:{awesome:true,nice:true},speed:{fast:true}},
    javascript:{is:{nice:true}}
  });

Or

mydb.addSOP({
    hexastore:{awesome:{is:true},nice:{is:true},fast:{speed:true}},
    javascript:{nice:{is:true}}
  };)

You get it ? So basically you can use any of the 6 orderings of the hexastore :

mydb.addSPO(...);
mydb.addSOP(...);
mydb.addOSP(...);
mydb.addOPS(...);
mydb.addPSO(...);
mydb.addPOS(...);

Databases are imported and exported as Subjects containing Predicates containing Objects containing Values (SPO ordering). Import and export can work on normal JSON files, or on Zipped "data.json" files.

db.import("Mydatabase");    // Import "Mydatabase.json"
db.importZip("Mydatabase"); // Import "Mydatabase.zip"

db.export("Mydatabase");    // Export "Mydatabase.json"
db.exportZip("Mydatabase"); // Export "Mydatabase.zip"

Search is sooo simple. Just query a set of triples, adding [] around variable names

var result = db.search([
    [["what"],"is","nice"]
  ]);
// result == [{what:hexastore},{what:javascript}]

A bit more complex

var result = db.search([
    [["what"],"is","nice"]
    [["what"],"speed",["howfast"]]
  ]);
// result == [{what:"hexastore",howfast:"fast"}]

Queries are really fast, so don't hesitate to do complex queries.