TypeError: Cannot read properties of undefined (reading 'toString')

[drewpereli]

I'm getting this error when trying to set up a simple example with express-slowdown and rate-limit-redis. Here's the full example:

import express from 'express';
import RedisStore from 'rate-limit-redis';
import slowDown from 'express-slow-down';
import { createClient } from 'redis';

(async () => {
  const client = createClient();

  await client.connect();

  const app = express();

  const speedLimiter = slowDown({
    windowMs: 30 * 1000,
    delayAfter: 1,
    delayMs: 500,
    store: new RedisStore({
      sendCommand: (...args) => client.sendCommand(args),
    }),
  });

  app.use(speedLimiter);

  app.all('*', (req, res) => {
    res.send('Hello');
  });

  app.listen(3000, () => {
    console.log('Server listening on port 3000');
  });
})();

Versions of relevant packages:

express-slow-down@1.6.0
express@4.18.2
rate-limit-redis@3.0.2
redis@4.6.6

I'm assuming the error is on my end somewhere, but any help would be greatly appreciated. Thanks!

[nfriedly]

Hey, I'm sorry about this, I think if you switch to rate-limit-redis@2.x it will work.

We upgraded the store interface in express-rate-limit, and rate-limit-redis@3.x is using the new interface (only). We're planning on upgrading express-slow-down to also be able to use the new interface, but no one has been able to get to it yet, so things are a bit messy right now.

[drewpereli]

No worries, thank you for the response, and for this awesome package!

[nfriedly]

This is now fixed properly with the release of express-slow-down v2.0.0 - the library was re-written to be a wrapper around express-rate-limit and thus now has full compatibility with express-rate-limit stores.