How to write server side code in SvelteKit

When I was writing Next.js code, if I wanted to write server side code only on my React component, I could do it in getInitialProps() lifecycle. But in SvelteKit that doesn’t exist. And if I try to console.log(process) variable, I get this error message:

ReferenceError: process is not defined

Is there a way to access the process object and do some server-side only code?

The answer is yes! You can import the browser variable from the $app/env library that SvelteKit provides or you can create endpoint files that have the same filename.

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Let’s see how we put these solutions into practice.

The quickest solution: Use the variable, browser

The first step is to import the variable, browser from the $app/env library.

import { browser } from '$app/env';

If you import this library in a .svelte file make sure to do it in a <script> tag. But you can do this also in a .js or .ts file.

The variable browser will return a boolean depending if the app is running in the browser or on the server.

Wherever you’re writing your code just wrap your server-side code inside an IF condition as such:

// If server
if (!browser) {
  // Only prints on the server-side

The output looks like this on my terminal:


Full code example

  import { browser } from '$app/env';

  if (!browser) {


The better solution: Create an endpoint file

Even though the solution above works fine. I really would enjoy if my server code wasn’t in my .svelte file. And it happens to turn out that SvelteKit has a solution for that.

If you create a .js or .ts file that has the same name as your .svelte template file, the page will get its props from the endpoint!

Here’s an example, first let’s create a svelte file in our routes directory.

  export let title;


In the routes directory i’ve created the homepage file (index.svelte), and I’ve exported a prop called title.

Now let’s create an endpoint that will toss dynamic props to our svelte template file.

export function get() {

  // Do dynamc fetching or computing here

  return {
    body: {
      title: 'Dashboard panel'

It’s that easy! Let’s go over a breakdown.

I created a new file called index.js and it’s returning the body object that contains the title prop value.

It’s important to note that you export the function name as get() to make sure this works properly, otherwise you may get an undefined variable in your .svelte file.

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