The express framework in Node.js, which is automatically updated after modifying the content (no restart)

In the previous express framework in node, after each code modification, you need to re-npm start to see the effect of the change, which is very troublesome, so the nodemon module is introduced here to achieve the advantage of automatic update without restarting

1. Install nodemon globally

npm install -g nodemon

or install locally

npm install nodemon --save

2. Create a nodemon.json file in the project directory

{
    "restartable": "rs",
    "ignore": [
        ".git",
        ".svn",
        "node_modules/**/node_modules"
    ],
    "verbose": true,
    "execMap": {
        "js": "node --harmony"
    },
    "watch": [

    ],
    "env": {
        "NODE_ENV": "development"
    },
    "ext": "js json"
}

restartable-set restart mode 
ignore-set ignore file 
verbose-set log output mode, true verbose mode 
execMap-set the suffix name of running service and the corresponding command 
{ 
"js": "node -harmony" 
} 
means use nodemon instead of node 
watch- Monitor which files change, and automatically restart when changed 

ext-monitor the specified suffix file name

3. Modify the app.js file 

Remember to note the last line: module.exports = app;

var debug = require('debug')('my-application'); // debug模块
app.set('port', process.env.PORT || 3000); // set listening port

// start listening
var server = app.listen(app.get('port'), function() {
  debug('Express server listening on port ' + server.address().port);
});

//module.exports = app;//This is the default configuration of 4.x, the app module is separated, just annotate it, and you can change it back when you go online

4. After the configuration is complete, run it

nodemon app.js