Connecting To The Blockchain With Svelte

Published: Thu Oct 07 2021

This is a quick brain dump on how to interact with Ethereum via SvelteKit. I’ve instantiated the basic SvelteKit skeleton project.

Connect to the blockchain

Keeping this short but chock full of everything we need to get our metamask wallet connected. One thing to realize is that with this, you have user authentication. It’s fantastic and built in to web3

Using the base skeleton project we just need to modify src/routes/index.svelte to the following (for a super basic example).


	// We will need onMount to run checks when page loads
	import { onMount } from 'svelte';
	import { ethers } from 'ethers';

	$: account = null;
	onMount(async () => {
		try {
			// Get ethereum (injected from metamask)
			const { ethereum } = window;
			const provider = new ethers.providers.Web3Provider(ethereum);
			// Signer will be the 'user' of metamask
			const signer = provider.getSigner();
			// alert user if they don't have metamask
			if (!ethereum) {
				alert('Get MetaMask!');
			// Check to make sure there is an account from
			// metamask
			const accounts = await ethereum.request({ method: 'eth_accounts' });
			if (accounts.length !== 0) {
				account = accounts[0];
		} catch (error) {
	// If we don't have accounts we will use this to attach
	// the wallet to the site.
	async function attachWallet() {
		const provider = new ethers.providers.Web3Provider(window.ethereum, 'any');
		// Prompt user for account connections
		await provider.send('eth_requestAccounts', []);
		const signer = provider.getSigner();
		account = await signer.getAddress();

{#if !account}
<p>Attach your wallet</p>
	<button on:click="{attachWallet}">Attach Wallet</button>
<p>Address Connected: {account}</p>

	p {
		text-align: center;

That’s It

That’s all there is to it. This creates the ability to interact with the blockchain!