Debug Kibana backend Node.js code.

Debugging Kibi backend

# First breakpoint.

Write `debugger;` on a new line before the piece of code you want to debug.

# Run Kibi with debug option

## 1st way.
NODE_OPTIONS=--debug bin/kibi --dev

## 2nd way.
If you want to break before starting:
NODE_OPTIONS="--debug --debug-brk" bin/kibi --dev

## 3rd way.
Alternatively, you can set the same variable when calling npm start:
NODE_OPTIONS=--debug npm start

You will see:
Debugger listening on port 5858
...

# Run the debugger console

You can then use the node inspector by running `node-inspector` in a separate terminal and opening http://127.0.0.1:8080/debug?port=5858.
!!! Attention. Port 5858 could changed to other port. Look for the correct debug port in the terminal output during Kibi load. 
For example, `Debugger listening on port 5861`.
Wait for 2-4 minutes before the debugger console is loaded. It will break on the `debugger;` line.
Now, you can add new breakpoints directly via the debugger console web interface. For it, click right mouse button on a line number, then select `Add Breakpoint`.

# Debug on a remote server

If you are debugging a remote server, you can either run node-inspector on the server and forward port 8080 through SSH, or you can run node-inspector locally and forward port 5858 through SSH.

http://stackoverflow.com/questions/36899554/debugging-kibana-backend-node-js-code