31 - NDN-JS Usages¶

Introduction¶

NDN-JS 1 is the first native version of the NDN protocol written in JavaScript. It implements the NDN-TLV wire format.

The primary goal of NDN-JS is to provide a pure Javascript implementation of the NDN API that enables developers to create browser-based or Node.js-based applications using Named Data Networking.

In this document, I will show how to use NDN-JS JavaScript API to ping my ndnpingserver.

Preparation¶

Clone the NDN-JS from github :

git clone https://github.com/named-data/ndn-js.git

And I just use JavaScript API, so I can include the library from websites and do not have to install anything.

https://cdn.rawgit.com/named-data/ndn-js/master/build/ndn.js

https://cdn.rawgit.com/named-data/ndn-js/master/build/ndn.min.js

NDNPING by JavaScript API¶

Now, change directory to the ndnping example that just cloned from githug :

cd ndn-js/examples/ndnping

Then edit ndn-ping.js.

Replace

var hostip = "spurs.cs.ucla.edu";

with

var hostip = "<your_pingserver_ip_address>";

And find the dopings() funtion, write the pingserver name here.

function dopings() {
    ping("/ndn/tw/edu/ncnu/csie/jarvis");
}

Then edit ndn-ping.html.

Replace

<script type="text/javascript" src="../../build/ndn.js"></script>

with

<script type="text/javascript" src="https://cdn.rawgit.com/named-data/ndn-js/master/build/ndn.js"></script>

Now, open the ndn-ping.html in browser. The ping message would show like this :

My demo website here : http://ms14.voip.edu.tw/~wei0923/NDN/ndnping/

Summary¶

NDN-JS provides JavaScript API to implement the NDN-TLV wire format. This means I can use JavaScipt to develop web application over NDN.

There are many examples in NDN-JS that I clone from github, and ndnping is just one of them. I am trying the examples of producer and consumer. So that I can use web to register my name, publish the content and send interest to get the content on web!

Reference¶

1: NDN-JS github : https://github.com/named-data/ndn-js