How to get current user IP Address in Cloudflare Workers

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Sometimes there are security requirement to get the user ip address so let’s see how can we get user ip while using cloudflare workers.

Please note that IP address is considered personal data so please ensure to follow the data privacy laws.

Step 1: Setup

Let’s create a new cloudflare app

terminal

npm create cloudflare@latest

Now select the “Hello World” workers

Step 2: Getting User Ip

Now in the src/index.ts file we will try to access the user ip.

Cloudflare workers request has the header “CF-Connecting-IP”. We can access this header to get the user ip address.

src/index.ts

export interface Env {}

export default {
 async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
  return Response.json({ userIP: request.headers.get('CF-Connecting-IP') });
 },
};

Now run the server in the remote mode. If you run the server without remote mode then you will not get the ip address.

If you’re using npm then add a new script in package.json

terminal

"dev:remote": "wrangler dev --remote",

terminal

npm run dev:remote
#or
pnpm run dev --remote 

You will get the response

terminal

{"userIP": "xx.xx.xx.xx"}

Conclusion

So in this post we used cloudflare workers to get the user ip address.

If you have any queries we can discuss it on discord.