How to debug a nodejs readline app?

Question

I want to debug a simple nodejs readline programme.

var readline = require("readline");
var rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

rl.question("What's your name \n",function(answer){
    var x =10;  // set the break point here
    console.log("your name is ",answer);
    rl.close();
});

I set the break point at var x = 10; inside callback function of rl.question().but the break point never hits.

Why this happening I am confused.
Then how to debug a readline programme.

Peter Lyons · Accepted Answer · 2015-12-15 01:49:31Z

3

Have you tried using node-inspector? I was able to debug fine from there. If your program is terminal-based, using a web-based debugger and thus leaving the terminal available for the app might avoid some confusion and trickiness.

answered Dec 15, 2015 at 1:49

Peter Lyons

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Frazer Kirkman · Accepted Answer · 2017-08-20 08:40:41Z

1

I use

node --inspect yourFile.js

which outputs: Debugger listening on ws://127.0.0.1:9229/abcXXX-....

I access it through Vivaldi, Chrome or Opera using: vivaldi://inspect or chrome://inspect

On this page it shows 'Remote Targets' and you click inspect on yourFile. That opens basically the same debugger you use in the web console.

answered Aug 20, 2017 at 8:40

Frazer Kirkman

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