supabase/apps/docs/content/guides/functions/connect-to-postgres.mdx

---
id: 'examples-postgres-on-the-edge'
title: 'Connecting directly to Postgres'
description: 'Connecting to Postgres from Edge Functions.'
subtitle: 'Connecting to Postgres from Edge Functions.'
tocVideo: 'cl7EuF1-RsY'
---

Connect to your Postgres database from an Edge Function by using the `supabase-js` client.
You can also use other Postgres clients like [Deno Postgres](https://deno.land/x/postgres)

## Using supabase-js

The `supabase-js` client is a great option for connecting to your Supabase database since it handles authorization with Row Level Security, and it automatically formats your response as JSON.

```ts index.ts
import { createClient } from 'https://esm.sh/@supabase/supabase-js'

Deno.serve(async (_req) => {
  try {
    const supabase = createClient(
      Deno.env.get('SUPABASE_URL') ?? '',
      Deno.env.get('SUPABASE_ANON_KEY') ?? '',
      { global: { headers: { Authorization: req.headers.get('Authorization')! } } }
    )

    const { data, error } = await supabase.from('countries').select('*')

    if (error) {
      throw error
    }

    return new Response(JSON.stringify({ data }), {
      headers: { 'Content-Type': 'application/json' },
      status: 200,
    })
  } catch (err) {
    return new Response(String(err?.message ?? err), { status: 500 })
  }
})
```

## Using a Postgres client

Because Edge Functions are a server-side technology, it's safe to connect directly to your database using any popular Postgres client. This means you can run raw SQL from your Edge Functions.

Here is how you can connect to the database using Deno Postgres driver and run raw SQL.

Check out the [full example](https://github.com/supabase/supabase/tree/master/examples/edge-functions/supabase/functions/postgres-on-the-edge).

```ts index.ts
import * as postgres from 'https://deno.land/x/postgres@v0.17.0/mod.ts'

// Get the connection string from the environment variable "SUPABASE_DB_URL"
const databaseUrl = Deno.env.get('SUPABASE_DB_URL')!

// Create a database pool with three connections that are lazily established
const pool = new postgres.Pool(databaseUrl, 3, true)

Deno.serve(async (_req) => {
  try {
    // Grab a connection from the pool
    const connection = await pool.connect()

    try {
      // Run a query
      const result = await connection.queryObject`SELECT * FROM animals`
      const animals = result.rows // [{ id: 1, name: "Lion" }, ...]

      // Encode the result as pretty printed JSON
      const body = JSON.stringify(
        animals,
        (key, value) => (typeof value === 'bigint' ? value.toString() : value),
        2
      )

      // Return the response with the correct content type header
      return new Response(body, {
        status: 200,
        headers: { 'Content-Type': 'application/json; charset=utf-8' },
      })
    } finally {
      // Release the connection back into the pool
      connection.release()
    }
  } catch (err) {
    console.error(err)
    return new Response(String(err?.message ?? err), { status: 500 })
  }
})
```

## Using Drizzle

You can use Drizzle together with [Postgres.js](https://github.com/porsager/postgres). Both can be loaded directly from npm:

```json supabase/functions/import_map.json
{
  "imports": {
    "drizzle-orm": "npm:drizzle-orm@0.29.1",
    "drizzle-orm/": "npm:/drizzle-orm@0.29.1/",
    "postgres": "npm:postgres@3.4.3"
  }
}
```

```ts supabase/functions/drizzle/index.ts
import { drizzle } from 'drizzle-orm/postgres-js'
import postgres from 'postgres'
import { countries } from '../_shared/schema.ts'

const connectionString = Deno.env.get('SUPABASE_DB_URL')!

Deno.serve(async (_req) => {
  // Disable prefetch as it is not supported for "Transaction" pool mode
  const client = postgres(connectionString, { prepare: false })
  const db = drizzle(client)
  const allCountries = await db.select().from(countries)

  return Response.json(allCountries)
})
```

You can find the full example on [GitHub](https://github.com/thorwebdev/edgy-drizzle).

## SSL connections

Deployed edge functions are pre-configured to use SSL for connections to the Supabase database. You don't need to add any extra configurations.

If you want to use SSL connections during local development, follow these steps:

- Download the SSL certificate from [Database settings](https://supabase.com/dashboard/project/_/settings/database)

- In your [local .env file](https://supabase.com/docs/guides/functions/secrets), add these two variables:

```bash
SSL_CERT_FILE=/path/to/cert.crt # set the path to the downloaded cert
DENO_TLS_CA_STORE=mozilla,system
```

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