Express.js middleware to support an LDP server built on MongoDB
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A simple Node.js module providing Express middleware to create a W3C Linked Data Platform server. The service uses abstract module storage.js for persistence, jsonld.js for JSON-LD support, and a few other JavaScript libraries. A sample app using the LDP middleware service is running at Apps that use ldp-service can utilize existing concrete implementations of storage.js: ldp-service-jena, ldp-service-fs and/or ldp-service-mongodb.

ldp-service supports LDP basic and direct containers. Indirect containers and non-RDF source are not implemented.

Many thanks to Steve Speicher and Sam Padgett for their valuable contribution to LDP and this LDP middleware.

Module planning, maintenance and issues can be see at at the ldp-service IBM Bluemix DevOps Services project.


  1. Install the required modules

Install Node.js.

Install and start MongoDB.

Install express.js and create a sample express app

$ npm install express -g
$ express --git -e <appDir>
  1. Edit the package.json file to add a dependency on ldp-service

    "dependencies": {"ldp-service": "~0.0.1"},

  2. Edit app.js and add whatever Express middleware you need including ldp-service. ldp-service also provides access to its MongoDB database in case additional middleware needs direct access to the database.

    var ldpService = require('ldp-service'); app.use(ldpService()); var db = ldpService.db; // incase further middleware needs access to the database

  3. Configuration defaults can be found in config.json. These may be overridden by variables in the environment, including Bluemix variables if deployed in a Bluemix app.

  4. To start the app, run these commands

    $ npm install $ node app.js

Finally, point your browser to http://localhost:3000/.


Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.