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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
Share Improve this question edited Nov 20, 2024 at 22:29 Brian Tompsett - 汤莱恩 5,89372 gold badges61 silver badges133 bronze badges asked Nov 20, 2024 at 16:29 hantorenhantoren 1,2656 gold badges27 silver badges47 bronze badges
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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()

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