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REPL stands for: read, eval, print and loop.
JavaScript debugger link
This does not support server side debugging.
Node Debugger link
This does not stop the execution of your code, and gives no help in finding out where you are, or what you can do.
Node Inspector link
Amazing in-browser debugging of your code. It does not work well when you have transcompilers like coffeescript, 6to5 or typescript.
node src/example.js
or
coffee src/example.coffee
npm install --save-dev pryjs