I have a Next.js application hosted on Vercel at example. I also have an API hosted at api.example, which receives requests from the frontend. However, when I try to log the client IP address in the API, I only see the IP address of example (the Vercel server) instead of the actual client IP address.

Here’s what I’ve tried so far:

1. Reading req.headers['x-forwarded-for']: I added middleware on my API to log this header, but it always seems to contain the Vercel server IP.

I have a Next.js application hosted on Vercel at example. I also have an API hosted at api.example, which receives requests from the frontend. However, when I try to log the client IP address in the API, I only see the IP address of example (the Vercel server) instead of the actual client IP address.

Here’s what I’ve tried so far:

1. Reading req.headers['x-forwarded-for']: I added middleware on my API to log this header, but it always seems to contain the Vercel server IP.

• node.js
• next.js
• proxy
• vercel

1 Answer 1

Are you reading the first IP of the returned array, which should be the client one?

const clientIp = (req.headers['x-forwarded-for'] || '').split(',')[0].trim()