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GeoIP Example

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This recipe demonstrates how to build a GeoIP lookup service with Fiber. It proxies requests to the ip-api.com JSON API and caches responses for 10 minutes using Fiber's built-in cache middleware.

Note: This recipe depends on the free ip-api.com service. The free tier is limited to 1000 requests per minute from a single IP address. For higher traffic, consider a paid plan or a self-hosted alternative such as geoip-maxmind.

Prerequisites​

  • Go 1.21+
  • Internet access (ip-api.com is called at runtime — no local database required)

Setup​

  1. Clone the repository:

    git clone https://github.com/gofiber/recipes.git
    cd recipes/geoip

  2. Install dependencies:

    go get

Running the Application​

go run main.go

The server starts on port 3000 by default. Set the PORT environment variable to override:

PORT=8080 go run main.go

Open http://localhost:3000 in a browser to use the web UI.

Example​

Look up geolocation data for an IP address via the /geo endpoint:

curl "http://localhost:3000/geo?ip=178.62.56.160"

Example response:

{
  "status": "success",
  "country": "United Kingdom",
  "countryCode": "GB",
  "region": "ENG",
  "regionName": "England",
  "city": "London",
  "zip": "EC1A",
  "lat": 51.5085,
  "lon": -0.1257,
  "timezone": "Europe/London",
  "isp": "DigitalOcean, LLC",
  "org": "DigitalOcean, LLC",
  "as": "AS14061 DigitalOcean, LLC",
  "query": "178.62.56.160"
}

Omit the ip query parameter to look up the caller's own IP address:

curl "http://localhost:3000/geo"

References​