ISO 3166-2 API

Access all of the world's subdivision/regional ISO 3166-2 codes

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No keyHTTPSCORSGeocoding

Verified today: 100% uptime

API key

Not required

HTTPS

Supported

Browser calls

Yes, CORS enabled

Status

Live · 100/100

Overview & Architectural Role

ISO 3166-2 API provides programmatic access to access all of the world's subdivision/regional iso 3166-2 codes. Delivered over secure HTTPS protocols, it exposes structured endpoints designed to integrate cleanly into modern frontend frameworks, backend microservices, and automated data pipelines without requiring local database provisioning.

Who it is built for

Engineers building web dashboards, mobile applications, CLI utilities, or background cron workers in need of reliable geocoding data feeds.

Architectural Advantage

Consuming ISO 3166-2 API removes the operational overhead of running custom scrapers, orchestrating headless browser fleets, or manually seeding and maintaining a local database. Instead of reverse-engineering volatile DOM layouts or dealing with anti-bot IP blocks, your application connects directly to a standardized JSON interface that supports client-side browser execution out of the box. Zero-authentication access allows rapid prototyping and zero-credential static deployments.

What our checks found

Health score: 100/100
Reliability: 100%
Average latency: 930ms

Last checked 2026-10-24. Measured independently, not self-reported by the provider.

Core Use Cases & Architecture Ideas

Practical real-world patterns for integrating ISO 3166-2 API into software systems.

Autocomplete Address & Location Form

Prevent shipping errors by resolving postal codes and street addresses into standardized coordinates during signup or checkout.

Architecture: Debounced client-side input calls an internal proxy route connected to ISO 3166-2 API, returning instant coordinate suggestions.

Store Locator & Proximity Matcher

Calculate the closest physical branches or delivery hubs based on user-provided city names or latitude/longitude.

Architecture: Backend geocodes user input via ISO 3166-2 API, then executes spatial PostGIS queries to return the top nearest facilities sorted by distance.

Interactive Travel & Route Visualizer

Plot points of interest, tourist paths, or elevation profiles dynamically on Leaflet/MapLibre map canvases.

Architecture: Single-page web client ingests geospatial GeoJSON boundaries from ISO 3166-2 API and renders vectorized overlays onto map layers.

Code Implementation Examples

Production-ready starting templates with error handling for ISO 3166-2 API.

// No authentication required.
// Modern native fetch with error handling
async function callApi() {
  try {
    const response = await fetch('https://iso3166-2-api.vercel.app/api/v1/resource', {
      method: 'GET',
    headers: { Accept: 'application/json' },
    });

    if (!response.ok) {
      throw new Error(`HTTP ${response.status}: ${response.statusText}`);
    }

    const data = await response.json();
    console.log('Response payload:', data);
    return data;
  } catch (error) {
    console.error('API request failed:', error);
    throw error;
  }
}

// callApi();

Response Payload & Live Testing

Inspect the expected JSON structure returned by ISO 3166-2 API or execute a real-time live probe directly in your browser.

Expected JSON Response Payload

Authentic sample payload structure to evaluate schema attributes before integration.

{
  "query": "San Francisco, CA",
  "results": [
    {
      "formatted_address": "San Francisco, California, USA",
      "lat": 37.7749,
      "lon": -122.4194,
      "timezone": "America/Los_Angeles",
      "postal_code": "94102"
    }
  ],
  "total_matches": 1
}

Format: application/json✓ CORS verified: Safe for direct browser calls

Integration Considerations & Best Practices

Technical factors to keep in mind when integrating ISO 3166-2 API into production environments.

Implement In-Memory or Edge Caching

Avoid triggering rate limits on public feeds by caching response payloads in Redis, Vercel KV, or standard HTTP Cache-Control headers with a 5-to-15 minute TTL.

Zero-Credential Environment Protection

While no API key is required, public keyless pools often share global rate limits. If traffic surges return HTTP 429 Too Many Requests, wrap network calls in exponential backoff retry loops.

Direct Client-Side Browser Support

CORS headers are validated and present on responses. You can safely call this endpoint directly from frontend React, Vue, or static HTML pages without an intermediary proxy server.

Validate HTTP Status Before Parsing JSON

Always inspect response.ok before executing response.json(). Upstream services returning 4xx or 502 Bad Gateway often serve HTML error pages, which cause syntax errors when parsed as JSON.

Where this listing comes from

Find IP address location information

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Verified today: 100% uptime

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ISO 3166-2 API — common questions

Answered from what our own scheduled checks found, not from the provider's marketing.

Is ISO 3166-2 API free to use?

ISO 3166-2 API is listed in our free catalogue and required no credential when we called it. It needs no authentication at all, so you can send a request without signing up. Free tiers can still carry rate limits or non-commercial terms, so check the provider's own terms before shipping.

Does ISO 3166-2 API need an API key?

No. We called ISO 3166-2 API on 2026-10-24 with no key, no token and no Authorization header, and it responded. That is what puts it in our no-key collection.

Can I call ISO 3166-2 API from browser JavaScript?

Yes. ISO 3166-2 API returned CORS headers when we checked it, so a browser will let your page read the response. You can fetch it directly from client-side JavaScript with no proxy and no backend.

Is ISO 3166-2 API still working?

Yes, as of 2026-10-24. Our automated check reached ISO 3166-2 API and recorded a 100% reliability score with a median response time of 930 ms. We re-check on a schedule, and this page updates with the result.

Is ISO 3166-2 API available over HTTPS?

Yes. ISO 3166-2 API serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.