How to check if user is authenticated on SvelteKit
SvelteKit is a powerful framework for building web applications with Svelte. When working on an application that requires authentication, it’s important to be able to check if a user is authenticated or not. In this blog post, we’ll explore different ways to achieve this in SvelteKit.
Solution 1: Using a writable store
One way to check if a user is authenticated in SvelteKit is by using a writable store. A writable store allows you to create a value that can be updated from anywhere in your application. Here’s how you can implement this:
// stores/auth.js
import { writable } from 'svelte/store';
export const isAuthenticated = writable(false);
// components/Navbar.svelte
In the code above, we create a writable store called isAuthenticated
in the stores/auth.js
file. We initialize it with a default value of false
. In the Navbar.svelte
component, we import the isAuthenticated
store and use it in an if
block to conditionally render the appropriate content based on the user’s authentication status.
Solution 2: Using session variables
Another approach to check if a user is authenticated in SvelteKit is by using session variables. SvelteKit provides a built-in session store that allows you to store data that persists across requests. Here’s how you can implement this:
// components/Login.svelte
// components/Navbar.svelte
In the code above, we have a Login.svelte
component that handles the login functionality. When the user clicks the “Log in” button, we make an API call to the login
function, which returns the user object. We then store the user object in the session store using $session.user = user;
. In the Navbar.svelte
component, we import the session store and use it in an if
block to conditionally render the appropriate content based on the presence of the user object in the session.
These are two common approaches to check if a user is authenticated in SvelteKit. You can choose the one that best suits your application’s needs. Happy coding!
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