Overview

ip-fast.com is a lightweight, no-auth API that returns the caller's IP address along with associated country and city information. It is perfect for quickly detecting where a user is connecting from without any setup or API key. Simply make a GET request and receive instant geolocation data.

Beginner Tip

You can call this API directly from a browser or curl with no setup at all. Use the ?format=json query parameter to receive a structured JSON response instead of plain text.

Available Data

The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.

country name and code
population
capital city
region and subregion
flag image URL
IP address information

Example Response

Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.

JSON Response · Illustrative
{
  "name": "Japan",
  "capital": "Tokyo",
  "population": 125800000,
  "region": "Asia",
  "languages": [
    "Japanese"
  ],
  "flag": "https://flagcdn.com/jp.svg",
  "currencies": [
    {
      "code": "JPY",
      "name": "Japanese yen"
    }
  ]
}

Field Reference

ip The public IP address of the requester
country Country name associated with the IP address
city City name associated with the IP address

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

Request
const url = "https://ip-fast.com/api/ip/?format=json";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.

Plain text response instead of JSON The default response is plain text; JSON format is not requested
Add ?format=json to your request URL to get a structured JSON response
Incorrect city or country returned IP geolocation databases have limited accuracy, especially for mobile or VPN IPs
This is a known limitation of IP geolocation; treat city-level data as approximate and country-level as more reliable
CORS error in browser Browser security policy blocking the cross-origin request
Check if the API supports CORS headers; if needed, make the call server-side or use a CORS proxy

Metadata Score Breakdown

Estimated from metadata — endpoint not independently tested

This score is estimated from observable metadata — HTTPS support, authentication model, declared CORS, and documentation reachability — because the API requires authentication or exposes no publicly testable endpoint. The five-signal breakdown is only shown for live-tested APIs.

Metadata estimate · endpoint not independently tested

Technical Specifications

Auth No Auth
HTTPS REQUIRED
CORS YES
Category Development
Difficulty Beginner
Listing details not endpoint-verified

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