supabase/apps/docs/content/guides/functions/quickstart.mdx

---
id: 'functions-quickstart'
title: 'Getting Started with Edge Functions'
description: 'Get started with Supabase Edge Functions.'
subtitle: 'Learn how to create, test, and deploy your first Edge Function using the Supabase CLI.'
---

This guide walks you through creating, testing locally, deploying, and invoking a Supabase Edge Function using the CLI. By the end, you'll have a working function running on Supabase's global edge network.

You can also create and deploy functions directly from the Supabase Dashboard. Read [the Dashboard Quickstart guide](/docs/guides/functions/quickstart-dashboard) for more information.

<Admonition type="note">

Supabase Edge Functions **only** supports creating functions in TypeScript with [the Deno runtime](https://deno.com/). This is because Deno was designed with extensibility in mind and its Rust codebase offers a modern developer experience, memory safety, and other features ideal for running edge functions.

</Admonition>

## Prerequisites

- Make sure you have the Supabase CLI installed and configured. Read [the CLI installation guide](/docs/guides/local-development) for installation methods and troubleshooting.
- Running and testing Supabase Edge Functions locally requires [Docker](https://www.docker.com/) or a Docker-compatible runtime.

## Step 1: Create or configure your project

If you don't have a project yet, initialize a new Supabase project in your current directory.

```bash
mkdir my-edge-functions-project
cd my-edge-functions-project
supabase init
```

If you already have a project locally, navigate to your project directory. If you haven't configured the project for Supabase yet, make sure to run the `supabase init` command.

```bash
cd your-existing-project
supabase init # Initialize Supabase, if you haven't already
```

<Admonition type="note">

After this step, you should have a project directory with a `supabase` folder containing a `config.toml` file.

</Admonition>

## Step 2: Create your first function

Within your project, generate a new Edge Function with a basic template:

```bash
supabase functions new hello-world
```

{/* TODO: Link to parameter documentation */}

<Admonition type="note" title="Secure your function with Supabase Auth">

When an HTTP request is sent to Edge Functions, you can use Supabase Auth to secure endpoints. By default, the `supabase functions new` command adds handling a valid publishable or secret key to the basic template. However, you can change this behavior with the `--auth` flag when creating a new function.

</Admonition>

This creates a new function at `supabase/functions/hello-world/index.ts` with this starter code:

```tsx
export default {
  fetch: withSupabase({ auth: ['publishable', 'secret'] }, async (req, ctx) => {
    const { name } = await req.json()

    return Response.json({
      message: `Hello ${name}!`,
    })
  }),
}
```

This function accepts a JSON payload with a `name` field and returns a greeting message.

<Admonition type="note">

The `supabase functions new` command also optionally creates Deno configuration for VSCode.

</Admonition>

## Step 3: Test your function locally

After starting Docker, start the local development server to test your function:

```bash
supabase start  # Start all Supabase services
supabase functions serve hello-world
```

On first use, the `supabase start` command downloads Docker images, and starts all Supabase services locally, which can take a few minutes.

Your function is now running at [`http://localhost:54321/functions/v1/hello-world`](http://localhost:54321/functions/v1/hello-world). Hot reloading is enabled, which means that the server automatically reloads when you save changes to your function code. Keep this terminal window open.

### Function not starting locally?

- Make sure Docker is running
- Run `supabase stop` then `supabase start` to restart services

### Port already in use?

- Check what's running with `supabase status`
- Stop other Supabase instances with `supabase stop`

## Step 4: Send a test request

Open a new terminal and test your function with curl. You can find your local Publishable key, by running `supabase status`, or you can find the complete `curl` command already in `functions/hello-world/index.ts`.

```bash
  curl -i --location --request POST 'http://127.0.0.1:54321/functions/v1/hello-world' \
    --header 'apiKey: <SUPABASE_PUBLISHABLE_KEY>' \
    --data '{"name":"Functions"}'
```

After running this curl command, you should see:

```json
{ "message": "Hello Functions!" }
```

You can also try different inputs. Change `"Functions"` to `"World"` in the curl command and run it again to see the response change.

<Admonition type="note">

After this step, you should have successfully tested your Edge Function locally and received a JSON response with your greeting message.

</Admonition>

## Step 5: Connect to your Supabase project

To deploy your function globally, you need to connect your local project to a Supabase project.

<Admonition type="note" title="Need to create a new Supabase project?">

Create one at [database.new](https://database.new/).

</Admonition>

First, login to the CLI if you haven't already, and authenticate with Supabase. This opens your browser to authenticate with Supabase; complete the login process in your browser.

```bash
supabase login
```

Next, list your Supabase projects to find your project ID:

```bash
supabase projects list
```

Next, copy your project ID from the output, then connect your local project to your remote Supabase project. Replace `YOUR_PROJECT_ID` with the ID from the previous step.

```bash
supabase link --project-ref [YOUR_PROJECT_ID]
```

<Admonition type="note">

After this step, you should have your local project authenticated and linked to your remote Supabase project. You can verify this by running `supabase status`.

</Admonition>

## Step 6: Deploy to production

Deploy your function to Supabase's global edge network:

```bash
supabase functions deploy hello-world
```

If you want to deploy all functions, run the `deploy` command without specifying a function name:

```bash
supabase functions deploy
```

<Admonition type="note" title="Docker not required">

The CLI automatically falls back to API-based deployment if Docker isn't available. You can also explicitly use API deployment with the `--use-api` flag:

```bash
supabase functions deploy hello-world --use-api
```

</Admonition>

When the deployment is successful, your function is automatically distributed to edge locations worldwide.

<Admonition type="note">

Now, you should have your Edge Function deployed and running globally at `https://[YOUR_PROJECT_ID].supabase.co/functions/v1/hello-world`.

</Admonition>

## Step 7: Test your live function

🎉 Your function is now live! Test it with your project's publishable key that you can find in the **Settings > API Keys** section of the [Dashboard](/dashboard/project/_/settings/api-keys):

```bash
curl --request POST 'https://[YOUR_PROJECT_ID].supabase.co/functions/v1/hello-world' \
  --header 'apikey: <SUPABASE_PUBLISHABLE_KEY>' \
  --header 'Content-Type: application/json' \
  --data '{"name":"Production"}'
```

**Expected response:**

```json
{ "message": "Hello Production!" }
```

## Usage

Now that your function is deployed, you can invoke it from within an app:

<Admonition type="note" label="Calling from the browser?">

Make sure your function can handle [CORS](/docs/guides/functions/cors) (Cross-Origin Resource Sharing) requests by configuring its headers correctly.

</Admonition>

<Tabs
  scrollable
  size="small"
  type="underlined"
  defaultActiveId="supabase-js"
>

<TabPanel id="supabase-js" label="Supabase Client">

```jsx
import { createClient } from '@supabase/supabase-js'

const supabase = createClient('https://[YOUR_PROJECT_ID].supabase.co', 'YOUR_PUBLISHABLE_KEY')

const { data, error } = await supabase.functions.invoke('hello-world', {
  body: { name: 'JavaScript' },
})

console.log(data) // { message: "Hello JavaScript!" }
```

</TabPanel>

<TabPanel id="fetch" label="Fetch API">

```jsx
const response = await fetch('https://[YOUR_PROJECT_ID].supabase.co/functions/v1/hello-world', {
  method: 'POST',
  headers: {
    apikey: '<SUPABASE_PUBLISHABLE_KEY>',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ name: 'Fetch' }),
})

const data = await response.json()
console.log(data)
```

</TabPanel>

</Tabs>