Edge Functions

Connecting directly to Postgres

Connecting to Postgres from Edge Functions.

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

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.

index.ts

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import { createClient } from 'https://esm.sh/@supabase/supabase-js'
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Deno.serve(async (_req) => {
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try {
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const supabase = createClient(
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Deno.env.get('SUPABASE_URL') ?? '',
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Deno.env.get('SUPABASE_ANON_KEY') ?? '',
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{ global: { headers: { Authorization: req.headers.get('Authorization')! } } }
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)
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const { data, error } = await supabase.from('countries').select('*')
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if (error) {
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throw error
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}
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return new Response(JSON.stringify({ data }), {
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headers: { 'Content-Type': 'application/json' },
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status: 200,
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})
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} catch (err) {
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return new Response(String(err?.message ?? err), { status: 500 })
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}
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})

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.

index.ts

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import * as postgres from 'https://deno.land/x/postgres@v0.17.0/mod.ts'
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// Get the connection string from the environment variable "SUPABASE_DB_URL"
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const databaseUrl = Deno.env.get('SUPABASE_DB_URL')!
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// Create a database pool with three connections that are lazily established
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const pool = new postgres.Pool(databaseUrl, 3, true)
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Deno.serve(async (_req) => {
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try {
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// Grab a connection from the pool
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const connection = await pool.connect()
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try {
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// Run a query
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const result = await connection.queryObject`SELECT * FROM animals`
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const animals = result.rows // [{ id: 1, name: "Lion" }, ...]
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// Encode the result as pretty printed JSON
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const body = JSON.stringify(
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animals,
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(key, value) => (typeof value === 'bigint' ? value.toString() : value),
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2
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)
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// Return the response with the correct content type header
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return new Response(body, {
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status: 200,
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headers: { 'Content-Type': 'application/json; charset=utf-8' },
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})
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} finally {
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// Release the connection back into the pool
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connection.release()
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}
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} catch (err) {
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console.error(err)
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return new Response(String(err?.message ?? err), { status: 500 })
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}
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})

Using Drizzle

You can use Drizzle together with Postgres.js. Both can be loaded directly from npm:

supabase/functions/import_map.json

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{
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"imports": {
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"drizzle-orm": "npm:drizzle-orm@0.29.1",
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"drizzle-orm/": "npm:/drizzle-orm@0.29.1/",
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"postgres": "npm:postgres@3.4.3"
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}
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}

supabase/functions/drizzle/index.ts

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import { drizzle } from 'drizzle-orm/postgres-js'
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import postgres from 'postgres'
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import { countries } from '../_shared/schema.ts'
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const connectionString = Deno.env.get('SUPABASE_DB_URL')!
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Deno.serve(async (_req) => {
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// Disable prefetch as it is not supported for "Transaction" pool mode
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const client = postgres(connectionString, { prepare: false })
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const db = drizzle(client)
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const allCountries = await db.select().from(countries)
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return Response.json(allCountries)
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})

You can find the full example on GitHub.

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:


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