Summary: SvelteKit integration with Lakebase Postgres connects a SvelteKit app to a serverless Postgres database through a secure server-side route using node-postgres, postgres.js, or the Neon serverless driver. Use this guide when setting up a new SvelteKit project that needs a Postgres backend, covering project creation, db.server.ts configuration, and a +page.server.ts load function. Requires a DATABASE_URL connection string with sslmode=require and channel_binding=require.

Set up a project on Neon in seconds and connect from a Sveltekit application

Pre-built prompt for connecting SvelteKit applications to Lakebase Postgres. View prompt

Sveltekit is a modern JavaScript framework that compiles your code to tiny, framework-less vanilla JS. This guide explains how to connect Sveltekit with Neon using a secure server-side request.

To create a project on Neon and access it from a Sveltekit application:

If you do not have one already, create a Neon project. Save your connection details including your password. They are required when defining connection settings.

1. Navigate to the Projects page in the Neon Console.
2. Click New Project.
3. Specify your project settings and click Create Project.

1. Create a Sveltekit project using the following commands:

   npx sv create my-app --template minimal --no-add-ons --types ts
   cd my-app

2. Add project dependencies using one of the following commands:

   node-postgres

   npm install pg dotenv

   postgres.js

   npm install postgres dotenv

   Neon serverless driver

   npm install @neondatabase/serverless dotenv

Add a .env file to your project directory and add your Neon connection string to it. You can find the connection string for your database by clicking the Connect button in the Console nav. For more information, see Connect from any application.

DATABASE_URL="postgresql://<user>:<password>@<endpoint_hostname>.neon.tech:<port>/<dbname>?sslmode=require&channel_binding=require"

There are two parts to connecting a SvelteKit application to Neon. The first is db.server.ts, which contains the database configuration. The second is the server-side route where the connection to the database will be used.

Create a db.server.ts file at the root of your /src directory and add the following code snippet to connect to your Neon database:

node-postgres

import 'dotenv/config';
import pg from 'pg';

const connectionString: string = process.env.DATABASE_URL as string;

const pool = new pg.Pool({
  connectionString,
  ssl: true,
});

export { pool };

postgres.js

import 'dotenv/config';
import postgres from 'postgres';

const connectionString: string = process.env.DATABASE_URL as string;

const sql = postgres(connectionString, { ssl: 'require' });

export { sql };

Neon serverless driver

import 'dotenv/config';
import { neon } from '@neondatabase/serverless';

const connectionString: string = process.env.DATABASE_URL as string;

const sql = neon(connectionString);
export { sql };

Create a +page.server.ts file in your route directory and import the database configuration:

node-postgres

import { pool } from '../db.server';

export async function load() {
  const client = await pool.connect();
  try {
    const { rows } = await client.query('SELECT version()');
    const { version } = rows[0];
    return {
      version,
    };
  } finally {
    client.release();
  }
}

postgres.js

import { sql } from '../db.server';

export async function load() {
  const response = await sql`SELECT version()`;
  const { version } = response[0];
  return {
    version,
  };
}

Neon serverless driver

import { sql } from '../db.server';

export async function load() {
  const response = await sql`SELECT version()`;
  const { version } = response[0];
  return {
    version,
  };
}

Create a +page.svelte file to display the data:

<script>
    export let data;
</script>

<h1>Database Version</h1>
<p>{data.version}</p>

When you run npm run dev you can expect to see the following on localhost:5173:

Database Version
PostgreSQL 17.2 on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit

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