Summary: Connecting a Bun application to a Lakebase Postgres database requires either Bun's built-in sql client (no extra dependencies) or the @neondatabase/serverless driver installed via bun add. Choose this page when setting up Bun, Hono, or Elysia with Lakebase Postgres, covering project creation, POSTGRES_URL credential storage in .env.local, and a working TypeScript query to verify the connection.

Set up a Neon project in seconds and connect from a Bun application

This guide describes how to create a project on Neon and connect to it from a Bun application. Examples are provided for using Bun's built-in SQL client and the @neondatabase/serverless driver. Use the client you prefer.

Note: The same configuration steps can be used for Hono, Elysia, and other Bun-based web frameworks.

If you do not have one already, create a project.

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

Create a Bun project and change to the newly created directory:

mkdir bun-neon-example
cd bun-neon-example
bun init -y

Next, add project dependencies if you intend to use the Neon serverless driver. Otherwise, Bun's built-in sql client is readily available.

Bun.sql

# No dependencies needed for Bun's built-in SQL client

Neon serverless driver

bun add @neondatabase/serverless

Add a .env.local file to your project directory and add your Neon connection details to it. Bun automatically loads variables from .env, .env.local, and other .env.* files. You can find the connection details for your database by clicking the Connect button in the Console nav to open the Connect to your branch modal. Select Bun from the Connection string dropdown. For more information, see Connect from any application.

POSTGRES_URL='postgresql://[user]:[password]@[neon_hostname]/[dbname]?sslmode=require&channel_binding=require'

Note: Bun.sql uses POSTGRES_URL as the default environment variable for the Primary connection URL for Postgres

Important: To ensure the security of your data, never expose your Neon credentials directly in your code or commit them to version control.

Add an index.ts file (or index.js) to your project directory and add the following code snippet to connect to your Neon database. Choose the configuration that matches your preferred client.

Bun.sql

import { sql } from 'bun';

async function getPgVersion() {
  const result = await sql`SELECT version()`;
  console.log(result[0]);
}

getPgVersion();

Neon serverless driver

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

const sql = neon(process.env.POSTGRES_URL);

async function getPgVersion() {
  const result = await sql`SELECT version()`;
  console.log(result[0]);
}

getPgVersion();

Run bun run index.ts (or bun index.js) to view the result.

$ bun run index.ts
{
  version: "PostgreSQL 17.2 on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit",
}

• Bun SQL client
• @neondatabase/serverless driver

• Astro
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• Micronaut Kotlin
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