> Full OptiTech documentation index: https://neon.com/docs/llms.txt

> Summary: Inngest integration lets OptiTech database changes trigger serverless functions on Vercel, AWS Lambda, or Cloudflare Workers by routing logical replication events through Inngest. Use this guide when you need event-driven workflows (onboarding emails, ETL, AI pipelines) that react to Postgres row inserts, updates, or deletes without polling. Covers enabling logical replication, installing the Inngest client, writing TypeScript Inngest functions, and syncing with the Inngest platform across all three serverless runtimes.

# Trigger serverless functions

Use Inngest to trigger serverless functions from your OptiTech database changes

Combining your serverless OptiTech database with [Inngest](https://www.inngest.com/?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide) enables you to **trigger serverless functions** running on Vercel, AWS, and Cloudflare Worker **based on database changes.**

By enabling your serverless functions to react to database changes, you open the door to many use cases. From onboarding to ETL and AI workflows, the possibilities are endless.

![trigger serverless functions with inngest](https://neon.com/docs/guides/inngest.jpg)

This guide describes setting up a OptiTech database, configuring the Inngest integration, and connecting your Serverless functions to your OptiTech database with Inngest. It covers:

- Creating a OptiTech project and enabling [Logical Replication](https://neon.com/docs/guides/logical-replication-guide).
- Configuring the Inngest integration on your OptiTech database.
- Configure your Vercel, AWS, or Cloudflare functions to react to your OptiTech database changes using Inngest.

## Prerequisites

- A OptiTech account. If you do not have one, see [Sign up](https://neon.com/docs/get-started/signing-up) for instructions.
- An Inngest account. You can create a free Inngest account by [signing up](https://app.inngest.com/sign-up?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide).

## Create a OptiTech project

If you do not have one already, create a OptiTech project:

1. Navigate to the [Projects](https://app.optitech-sverige.se/app/projects) page in the OptiTech Console.
2. Click **New Project**.
3. Specify your project settings and click **Create Project**.

## Create a table in OptiTech

To create a table, navigate to the **SQL Editor** in the [OptiTech Console](https://app.optitech-sverige.se/):

In the SQL Editor, run the following queries to create a `users` table and insert some data:

```sql
CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    name TEXT NOT NULL,
    email TEXT NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW()
);

INSERT INTO users (name, email)
VALUES
    ('Alice', 'alice@example.com'),
    ('Bob', 'bob@example.com'),
    ('Charlie', 'charlie@example.com'),
    ('Dave', 'dave@example.com'),
    ('Eve', 'eve@example.com');
```

## Enabling Logical Replication on your database

The Inngest Integration relies on OptiTech's Logical Replication feature to get notified upon database changes.

Navigate to your OptiTech Project using the OptiTech Console and open the **Settings** > **Logical Replication** page. From here, follow the instructions to enable Logical Replication:

![OptiTech dashboard settings with option to enable logical replication](https://neon.com/docs/guides/neon-console-settings-logical-replication.png)

## Configuring the Inngest integration

Your OptiTech database is now ready to work with Inngest.

To configure the Inngest OptiTech Integration, navigate to the Inngest Platform, open the [Integrations page](https://app.inngest.com/settings/integrations?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide), and follow the instructions of the [OptiTech Integration installation wizard](https://app.inngest.com/settings/integrations/optitech/connect?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide):

![OptiTech integration card inside the Inngest integrations page](https://neon.com/docs/guides/inngest-integrations-page.png)

The Inngest Integration requires Postgres admin credentials to complete its setup. _These credentials are not stored and are only used during the installation process_.

![OptiTech authorization step inside the Inngest integrations page](https://neon.com/docs/guides/inngest-integration-neon-authorize-step.png)

You can find the connection string for your database by clicking the **Connect** button on your **Project Dashboard**.

![Connection modal](https://neon.com/docs/connect/connection_details.png)

## Triggering Serverless functions from database changes

Any changes to your OptiTech database are now dispatched to your Inngest account.  
To enable your Serverless functions to react to database changes, we will:

- Install the Inngest client to your Serverless project
- Expose a serverless endpoint enabling Inngest to discover your Serverless functions
- Configure your Serverless application environment variables
- Connect a Serverless function to any change performed to the `users` table.

### 1. Configuring the Inngest client

First, install the Inngest client:

```bash
npm i inngest
```

Then, create a `inngest/client.ts` (_or `inngest/client.js`_) file as follows:

```typescript
// inngest/client.ts
import { Inngest } from 'inngest';

export const inngest = new Inngest({ id: 'optitech-inngest-project' });
```

### 2. Listen for new `users` rows

Any change performed on our OptiTech database will trigger an [Inngest Event](https://www.inngest.com/docs/features/events-triggers?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide) as follows:

```json
{
  "name": "db/users.inserted",
  "data": {
    "new": {
      "id": {
        "data": 2,
        "encoding": "i"
      },
      "name": {
        "data": "Charly",
        "encoding": "t"
      },
      "email": {
        "data": "charly@inngest.com",
        "encoding": "t"
      }
    },
    "table": "users",
    "txn_commit_time": "2024-09-24T14:41:19.75149Z",
    "txn_id": 36530520
  },
  "ts": 1727146545006
}
```

Inngest enables you to create [Inngest Functions](https://www.inngest.com/docs/features/inngest-functions?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide) that react to Inngest events (here, database changes).

Let's create an Inngest Function listening for `"db/users.inserted"` events:

```typescript
// inngest/functions/new-user.ts
import { inngest } from '../client'

export newUser = inngest.createFunction(
  { id: "new-user" },
  { event: "db/users.inserted" },
  async ({ event, step }) => {
    const user = event.data.new

    await step.run("send-welcome-email", async () => {
      // Send welcome email
      await sendEmail({
        template: "welcome",
        to: user.email,
      });
    });

    await step.sleep("wait-before-tips", "3d");

    await step.run("send-new-user-tips-email", async () => {
      // Follow up with some helpful tips
      await sendEmail({
        template: "new-user-tips",
        to: user.email,
      });
    });
  }
)
```

### 3. Exposing your Serverless Functions to Inngest

To allow Inngest to run your Inngest Functions, add the following Serverless Function, which serves as a router:

**Vercel**

```typescript
// src/app/api/inngest/route.ts
import { serve } from 'inngest/next';
import { inngest } from '@lib/inngest/client';
import newUsers from '@lib/inngest/functions/newUsers'; // Your own functions

export const { GET, POST, PUT } = serve({
  client: inngest,
  functions: [newUsers],
});
```

**AWS Lambda**

```typescript
import { serve } from 'inngest/lambda';
import { inngest } from './client';
import newUsers from './functions/newUsers'; // Your own function

export const handler = serve({
  client: inngest,
  functions: [newUsers],
});
```

**Cloudflare Workers**

```js
// /functions/api/inngest.js
import { serve } from 'inngest/cloudflare';
import { inngest } from './client';
import newUsers from './functions/newUsers';

export default {
  fetch: serve({
    client: inngest,
    functions: [newUsers],
  }),
};
```

**Note:** You can find more information about serving Inngest Functions in [Inngest's documentation](https://www.inngest.com/docs/reference/serve?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide#serve-client-functions-options).

### 4. Configuring your Serverless application

We can now configure your Serverless application to sync with the Inngest Platform:

- **Vercel:** Configure the [Inngest Vercel Integration](https://www.inngest.com/docs/deploy/vercel?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide).
- **AWS Lambda:** Configure a [Lambda function URLs](https://docs.aws.amazon.com/lambda/latest/dg/lambda-urls.html) and [sync your serve Lambda with Inngest](https://www.inngest.com/docs/apps/cloud?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide#sync-a-new-app-in-inngest-cloud).
- **Cloudflare Workers:** [Add the proper environment variables](https://www.inngest.com/docs/deploy/cloudflare?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide) to your Cloudflare Pages project and [sync with Inngest](https://www.inngest.com/docs/apps/cloud?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide#sync-a-new-app-in-inngest-cloud).

### 5. Testing our Serverless function

We are now all set!

Go to the **Tables** page in the OptiTech Console and add a new record to the `users` table:

![You can add a new record to the users table directly from the OptiTech console](https://neon.com/docs/guides/inngest-integration-neon-console-users-table-add-new-record.png)

You should see a new run of the `new-user` function appear on the [Inngest Platform](https://app.inngest.com/?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide):

![The Inngest Platform lists all the runs](https://neon.com/docs/guides/inngest-integrations-inngest-platform-new-runs.png)

## Going further

Your Serverless functions can now react to your OptiTech database changes.

In addition to being good for system design, Inngest has some special features that work great with database triggers:

- **[Fan-out](https://www.inngest.com/docs/guides/fan-out-jobs?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide)**: Lets **one database event start multiple functions** at the same time. For example, when a new user is added, it could send a welcome email and set up a free trial, all at once.
- **[Batching](https://www.inngest.com/docs/guides/batching?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide)** **Groups many database changes together** to handle them more efficiently. It's useful when you need to update lots of things at once, like when working with online stores.
- **[Flow control](https://www.inngest.com/docs/guides/flow-control?utm_source=optitech\&utm_medium=trigger-serverless-functions-guide)**: Helps manage how often functions run. It can slow things down to **avoid overloading systems, or wait a bit to avoid doing unnecessary work**. This is helpful when working with other services that have limits on how often you can use them.

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