Detailed introduction to debugging methods of NodeJs

About debugging

When we only focus on the front end, we are accustomed to F12, which will bring us a sense of security and comfort.

But when we use NodeJs to develop the backend, I think the nightmare is coming.

But don’t worry, debugging NodeJs is very inconvenient! Definitely.

But fortunately, we have ## node-inspector ## to help us solve part of the debugging problems, but it is still a bit inadequate for NodeJs, which has strong asynchronous capabilities.

node-inspector

Installing node-inspector

Still install node-inspector globally through npm

npm install -g node-inspector

Test code

//event.js
var events = require('events');
var util = require('util');
function tianxiasan(name){
 this.name = name;
 events.EventEmitter.call(this);
}
util.inherits(Restaurant, events.EventEmitter);
//定义角色
var restaurant = new tianxiasan('奕剑');

This is the code we want to debug

Start node-inspector

Start node-inspector first

C:\Users\Administrator>node-inspector
Node Inspector v0.12.8
Visit http://127.0.0.1:8080/?port=5858 to start debugging.

Okay, the startup is successful.

Start the debug mode of nodejs

Reopen a terminal, and then start the debug debugging function provided by nodejs

C:\Users\Administrator\Desktop>node --debug-brk event.js
Debugger listening on port 5858

- -debug-brk means to use debug mode to start event.js and breakpoint on the first line.

View the effect

In this way, the two programs communicate through socket. We can debug NodeJs in the Google Developer Tools in our properties.



#What a familiar interface. The debugging process below is similar to Js debugging.

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