How to Auto-Reload Files in Node.Js

How to auto-reload files in Node.js?

A good, up to date alternative to supervisor is nodemon:

Monitor for any changes in your node.js application and automatically restart the server - perfect for development

To use nodemon with version of Node without npx (v8.1 and below, not advised):

$ npm install nodemon -g
$ nodemon app.js

Or to use nodemon with versions of Node with npx bundled in (v8.2+):

$ npm install nodemon
$ npx nodemon app.js

Or as devDependency in with an npm script in package.json:

"scripts": {
  "start": "nodemon app.js"
},
"devDependencies": {
  "nodemon": "..."
}

How to auto-reload files in Node.js while using ESM?

Reading at esm issues it seems cache is intentionally not exposed.

I'm afraid the answer to your question is simply no.

Node JS Auto Reload

There are three common ways to achieve this:

Polling
Stream push
Webhook

Based on your code sample I assume that the RSS feeder is request/response. This lends well to polling.

A poll based program will make a request to a resource on an interval. This interval should be informed by resource limits and expected performance from the end user. Ideally the API will accept an offset or a page so you could request all feeds above some ID. This make the program stateful.

setInterval can be used to drive the polling loop. Below shows an example of the poller loop with no state management. It polls at 5 second intervals:

let Parser = require('rss-parser');
let parser = new Parser(); 

setInterval(async () => {
  let feed = await parser.parseURL('https://rss-checker.blogspot.com/feeds/posts/default?alt=rss');
  feed.items.forEach(items => {
    console.log(items);
  })
}), 5000);

This is incomplete because it needs to keep track of already seen posts. Creating a poll loop means you have a stateful process that needs to stay running.

How to automatically reload Node.js project when using pm2

By default, pm2 doesn’t automatically refresh our server every time we change files.
You need to start your pm2 project with the --watch cli argument in order to tell pm2 to refresh when files have changed:

pm2 start id_project --watch

check out the docs for more details, or @rogier-spieker answer which is more detailed.

how to reload the nodejs app after making changes to the file?

You need to stop and re run the server to see your latest update. To automate this, you can use nodemon, do npm i nodemon -g

And run nodemon http_test.js

Now, for every change you make tohttp_test.js the server will be restarted automatically

How do i auto-refresh my log rather then refreshing it manually

When you check box is checked, you can use setInterval() and when your checkbox is unchecked clearInterval.

Please check below working snippet.

*Note in this snippet, I have just used simple log for demo purpose. In that demo you can put your logic.

new Vue({  el: '#app',  data: {    checked: false,    autoRef:null  },  methods: {    toggle() {      if(this.checked){        this.autoRef = setInterval(() => {          this.logNode('Auto refresh called');        }, 3000);      }else{        clearInterval(this.autoRef);      }    },    logNode(msg) {      console.log(msg)    }  }});

.btn-success {  background: green;  padding: 10px;  border: 1px solid #ccc;  color: #fff;}

<link href="https://cdn.jsdelivr.net/npm/vuetify@1.2.2/dist/vuetify.min.css" rel="stylesheet" /><script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script><script src="https://cdn.jsdelivr.net/npm/vuetify@1.2.2/dist/vuetify.min.js"></script>
<div id="app" class="form-group row m-b-10">  <label class="col-form-label">Auto-Refresh:</label>  <div class="col-md">    <div class="switcher switcher-success">      <input type="checkbox" v-model="checked" name="switcher_checkbox_2" id="switcher_checkbox_2" checked="true" value="1" v-on:change="toggle">      <label for="switcher_checkbox_2"></label>    </div>    <div v-if="!checked" class="switcher switcher-success">      <button ref="myButton" @click="logNode('on button click')" class="btn btn-xs btn-success">Refresh</button>    </div>  </div>

Livereload for node.js. Is there possible?

Yes, nodemon is a utility that will monitor for any changes in your source and automatically restart your server.

Install nodemon globally npm install nodemon -g
Run the server nodemon app.js