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Node.js Debugger

Now it is possible to debug Node.js applications deployed to Openshift. All you need to do is creating a Server Adapter for the app and running it in the Debug mode. After that a new V8 debug session will be created:

v8 debug console

Put some breakpoints in the code and start debugging!

node js debugger

Steps by steps instructions

Step 1: deploy the nodejs:latest builder

Using the Openshift explorer, deploy a new application using the nodejs:latest builder image. Once deployed, your Openshift explorer should look like this:

node js debugger openshift explorer

Don’t forget to import the application source code into your workspace so that you can set breakpoints.

Step 2: create the server adapter

Select the nodejs service, right click and select the Server adapter menu item. An Openshift Server Adapter Settings dialog will be displayed, click the Finish button. The server adater will be created and the Servers view should look like this:

node js debugger servers view
Step 3: restart the server adapter in debug mode

In order to debug Javascript code, the server adapter must be restarted in debug mode. Select the server adapter, right click and select the Restart in Debug menu item. The Servers view should look like this:

node js debugger servers view1
Step 4: Add a breakpoint into the server code

Open the server.js file located into the nodejs-ex project that you imported in Step 1. Around line 79, the handler for the pagecount is defined so you can add a breakpoint in the following lines (line 82 for the first instruction).

node js debugger js editor
Step 5: Open the web browser

In the Openshift explorer, select the nodejs service, and select the Show in → Web Browser menu item. The home page for the application will be displayed:

node js debugger web browser
Step 6: Debug your Javascript code

Add pagecount at the end of the URL in the location toolbar and press ENTER. This will trigger Javascript debugging as you setup a breakpoint in Step 4. Depending on your Eclipse settings, you may see a dialog asking to switch to the debug perspective:

node js debugger debug perspective switch dialog

If you see this dialog, then press ENTER and the debug perspective will be shown. If you don’t see this dialog, then the debug perspective is directly shown.

node js debugger debug perspective

Changing the code during the debug session is also supported - just save the file and new changes will be applied automatically. Here is a short demo video which describes the debugging process in action:

Related JIRA: JBIDE-22225

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