Can some help me to understand the basics of server side rendering and client side rendering? And also the difference between them? When to use what? etc..

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4 answers

A similar question has been asked here. To give you a quick summary of why you should use Server Side Rendering, take a look at the following benefits:

  • Better Search Engine Optimization (SEO)
    No need for PhantomJS or Prerender!
  • No UI jumping/ glitches when loading pages
    Because the content is already there when loading!
  • Faster load times
    Instead of having to wait for javascript to take over and serve you the content, it's already there when loading the page!
  • SSR makes universal (isomorphic) applications possible
    Giving you the above benefits, while preserving the great user experience you have on the client.

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Let's start with an example.

Say you have a simple web application which displays the pictures of cats, and people can vote on how cute a cat is. (Honestly, this is the kind of app I'd like to work on)

Now, there are two methods to achieve this:

  • Client-Side Rendering -- the client, that is, the browser somehow gets the data, forms the DOM nodes, manipulates the DOM and displays the elements (rendering);

  • Server-side Rendering -- the server sends a pre-rendered (i.e., all the steps I outlines above been executed on the server-side) page, and that is displayed to the user.

Client-Side Rendering

With the upcoming craze of JavaScript frameworks like Angular 2 and React, this is the trend most developers follow. Essentially, any Client-Side rendered application can be broken down into two parts:

  • backend -- the side of the application which does not interact with the user directly; I say 'directly' because at the base level, it's the one which does the heavy lifting: executes tasks like saving data in the database, fetching the data, authenticating a user;

  • frontend -- the side of the application which the user interacts with; fetches the data from the server (through a transport), and displays it to the user;

  • transport -- the link between the frontend and the backend: the mode of transport for the data from and to the backend; an example would be JSON over REST.

So, say in Angular, I can have the following simple application skeleton:

<!DOCTYPE html>
<html lang="en">
        <title>Cute Cat App</title>
        <!-- Script tags to import Angular; Links for CSS, etc. -->
    <body ng-app="app" ng-controller="MainAppController as ctrl">
                <li ng-repeat="cat in ctrl.cats">
                <img src="{{ cat.imgSrc }}" alt="{{ }}" />
                {{ }}

Then in my application's main JavaScript file I can have

angular.module( 'app', [ ... dependencies ... ] );

    .module( 'app' )
    .controller( 'MainAppController', [ '$http', function( $http ) {

        $http.get( 'http(s)://<API_URL>/cats' ).then( data => {
            this.cats = data.cats;
        } ).catch( err => {

            // Some cool error-handling voo-doo

        } );

    } ] );

The GET URL probably returns something like the following:

    cats: [ 
            name: 'Mittens',
            imgSrc: '<GUID>.png'

So, to summarize:

  • Fetch the data from the backend;

  • Parse the data;

  • Manipulate the DOM with the data (with libraries like React, this is WICKED fast)


  • Super simple, and easily maintainable;
  • Modularizing does not become a pain;
  • Great SoS (Seperation of Concerns); i.e., the backend will only deal with the data, nothing else; and the frontend will only consume the data provided;


  • A little intimidating for new developers;
  • In a small team, the SoS model fails;
  • With big libraries, the application may get quite slow;

Server-Side Rendering

Very simple put, in this model, the server provides with a page which is already populated with the data. One method which I have used (guilty) is using a templating engine, and then churing out a ready-to-be-rendered page.

Imagine, something like this:

server.route( {
    method: 'GET',
    path: '/cats',
    handler: ( request, reply ) => {

        /* For the sake of this example, imagine that the constant `data` is already
             populated with the data; similar to the JSON I have in the previous example */
    const cats = ...;

        reply.view( 'cats', cats );

} );

In the end, a page like this is provided to the browser:

<!DOCTYPE html>
<html lang="en">
        <title>Cute Cat App</title>
        <!-- Script tags to import frameworks; Links for CSS, etc. -->
                <li ng-repeat="cat in ctrl.cats">
                <img src="<GUID>.png" alt="Mittens" />

So, the browser does not do anything fancy, apart from displaying some static (according to the browser) web content.


  • Super-Duper-Simple to set up;
  • Great for beginners;
  • Good for a team not looking at too many users;
  • Great for a small team where SoS doesn't really matter;


  • Super-Duper-Simple to screw up;
  • May pose a problem when setup begine Layer 4/7 load-balancing.

Again, if you need advice/tips in anything related to any of the techniques, feel free to comment! Anything, really. From deployment, to maintainance.

I hope this helps! :)

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@labsvisua Why would SSR screw up files? It's just that your server uses the same templates/components to render the app on server. What does it have to do with incorrect permissions, files etc?

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Hello, How to check if our app is already server side rendered?

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what should i see in my page source? <div id="app"></div> or <div id="app"><div>This is a content</div></div>? @pitu7dg

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@cliffrowley has explained it nicely in this discussion. But I would also like to see other explanations.

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VignesH KumaR's photo

VignesH KumaR


Front End Dev @ Freshworks Inc.,




Chennai, India

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