Express

The Express middleware is a basic wrapper around Javascript SDK. It provides a simple way to add the SDK to your Express application.

Looking for a step-by-step tutorial? Check out the Express analytics guide.

Installation

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.

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

Common options

apiUrl - The url of the openpanel API or your self-hosted instance
clientId - The client id of your application
clientSecret - The client secret of your application (only required for server-side events)
filter - A function that will be called before sending an event. If it returns false, the event will not be sent
disabled - If true, the library will not send any events

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.

Working with Groups

Groups let you track analytics at the account or company level. Since Express is a backend SDK, you can upsert groups and assign users from your route handlers.

See the Groups guide for the full walkthrough.

app.post('/login', async (req, res) => {
  const user = await loginUser(req.body);

  // Identify the user
  req.op.identify({ profileId: user.id, email: user.email });

  // Create/update the group entity
  req.op.upsertGroup({
    id: user.organizationId,
    type: 'company',
    name: user.organizationName,
    properties: { plan: user.plan },
  });

  // Assign the user to the group
  req.op.setGroup(user.organizationId);

  res.json({ ok: true });
});

Typescript

If req.op is not typed you can extend the Request interface.

import { OpenPanel } from '@openpanel/express';

declare global {
  namespace Express {
    export interface Request {
      op: OpenPanel;
    }
  }
}