Nationalize.io API
Overview
Nationalize.io predicts the likely nationality of a person based on their first name by analyzing a large database of name-to-country associations. The API returns a ranked list of countries with probability scores, so you can see which nationalities are most common for that name. It is free for moderate use and requires no API key, making it one of the simplest name-analysis APIs available.
Beginner Tip
Pass a first name as the "name" query parameter and you will receive an array of country predictions sorted by probability. For example, querying "Yuki" will return Japan with a high probability score. You can also send multiple names in one request using repeated "name[]" parameters to save round trips.
Measurement Record
What actually happened when we called this API from our own infrastructure. Every value below was recorded by the request, not copied from the provider's documentation.
- Request
- GET https://api.nationalize.io/?name=Yuki
- Result
- HTTP 200 · application/json · 256 bytes · compressed
- Response time
- 318 ms (median of 3) · fastest 317 ms
- Transport
- TLSv1.2 · ECDHE-RSA-AES128-GCM-SHA256 · certificate issued by Let's Encrypt
- Browser CORS
- Allowed — Access-Control-Allow-Origin: *
- Rate limit
- 25 per window
- Served by
- nginx/1.16.1
- Recorded
- 2026-08-10
Fields Returned
Top-level fields present in the response we captured, with the type and value we actually received.
| Field | Type | Value received |
|---|---|---|
| count | integer | 29153 |
| name | string | Yuki |
| country | array | [1 item] |
Captured Response
Captured from a real request to https://api.nationalize.io/?name=Yuki on 2026-08-10. Long arrays and nested objects are truncated to keep the shape readable.
{
"count": 29153,
"name": "Yuki",
"country": [
{
"country_id": "JP",
"probability": 0.463358
}
]
} Field Reference
name The input name that was analyzed. country Ranked list of country predictions. count Total number of data points used to generate the prediction. Implementation Example
Calls a real endpoint of this API. Replace any placeholder credentials with your own key.
const url = "https://api.nationalize.io/?name=Yuki";
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.
How This API Fails
We deliberately sent this API a broken request and recorded exactly what came back on 2026-08-10. Knowing the shape of an error before you hit it makes error handling much easier to write.
Returned an HTML error page rather than JSON — worth knowing if your client assumes every response can be parsed as JSON.
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.
Measured Score Breakdown
Live HTTP request to the API endpoint
Fully tested on Aug 10, 2026
Technical Specifications
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