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stats/apps/public/content/docs/(tracking)/sdks/express.mdx
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---
title: Express
description: The Express middleware is a basic wrapper around Javascript SDK. It provides a simple way to add the SDK to your Express application.
---
import Link from 'next/link';
import { Callout } from 'fumadocs-ui/components/callout';
import { DeviceIdWarning } from '@/components/device-id-warning';
import { PersonalDataWarning } from '@/components/personal-data-warning';
import CommonSdkConfig from '@/components/common-sdk-config.mdx';
<Callout>
Looking for a step-by-step tutorial? Check out the [Express analytics guide](/guides/express-analytics).
</Callout>
## Installation
```bash
pnpm install @openpanel/express
```
## Usage
The default export of `@openpanel/express` is a function that returns an Express middleware. It will also append the Openpanel SDK to the `req` object.
You can access it via `req.op`.
```ts
import express from 'express';
import createOpenpanelMiddleware from '@openpanel/express';
const app = express();
app.use(
createOpenpanelMiddleware({
clientId: 'xxx',
clientSecret: 'xxx',
// trackRequest(url) {
// return url.includes('/v1')
// },
// getProfileId(req) {
// return req.user.id
// }
})
);
app.get('/sign-up', (req, res) => {
// track sign up events
req.op.track('sign-up', {
email: req.body.email,
});
res.send('Hello World');
});
app.listen(3000, () => {
console.log('Server is running on http://localhost:3000');
});
```
### Options
<CommonSdkConfig />
#### Express options
- `trackRequest` - A function that returns `true` if the request should be tracked.
- `getProfileId` - A function that returns the profile ID of the user making the request.
## Typescript
If `req.op` is not typed you can extend the `Request` interface.
```ts
import { OpenPanel } from '@openpanel/express';
declare global {
namespace Express {
export interface Request {
op: OpenPanel;
}
}
}
```