0.1.6 • Public • Published


A JavaScript Linked Data stack/stub.

The ISWC 2014 paper LDApp - A JavaScript Linked Data Stack is a good starting point to get an overview.

Quick Start Guide

Install using npm

  • install using npm npm install ldapp
  • change folder cd node_modules/ldapp
  • start LDApp using npm npm start or node node ldapp.js

Install from sources

  • clone git repository git clone https://github.com/bergos/ldapp.git
  • change to LDApp folder cd ldapp
  • install dependencies and run build script using npm npm install
  • start LDApp using npm npm start or node node ldapp.js

Install WebID certificate

  • import the WebID PKCS12 certificate/key (data/webid.p12) in your browser (password test)


Now you can access the following URLs in your browser.

  • WebID profile: https://localhost:8443/card
  • raw blog data: https://localhost:8443/blog
  • blog application: https://localhost:8443/blog.html

RDF graph URLs (the WebID profile and the raw blog data) support content negotiation. By default application/ld+json, text/html and text/turtle will be accepted.

Example: Fetch the profile with curl using WebID authentication: curl -v -k -E data/webid.pem -H 'Accept: text/turtle' https://localhost:8443/card

Advanced Configuration

Persistence Triplestore

The default configuration of LDApp uses a in memory triplestore implementation. You can change this with the property config.store in data/config.js. There is already a commented example configuration for a SPARQL store. See the RDF-Ext documentation for other triplestore implementations.

Developer Guide

Folder Structure

  • data configuration, initial graph data and cert+key files
  • lib express modules with Promise API
  • utils util classes and functions for modules
  • public static files + HTML5 applications

Blog Example App

LDApp contains a simple blog example built with React, RDF-JSONify and RDF-Ext. Everything is rendered in the browser. Only static files are used.


Just a simple Bootstrap HTML template. The blog-header DIV block is used by React to insert the blog name and description. The blog-posts DIV block is used by React to insert the blog posts.


The JavaScript file which contains the app itself. The view and controller logic is implemented in React components. RDF-JSONify generated/consumed JSON-LD objects are used for the model.


Provides a Mozilla Persona like API to access the authentication assertion. The standard API function window.navigator.id.get returns the authentication assertion via callback. The window.navigator.id.get.agent function returns the agent IRI via Promise.

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npm i ldapp

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