Overview

Ziptastic is a simple, free API that returns the country, state, and city for any US zip code with no authentication required. It is one of the quickest ways to auto-fill address forms based on a zip code that a user types in. The response is minimal and easy to parse, making it perfect for beginners.

Beginner Tip

No API key is needed. Just make a GET request with the zip code as the last path segment. Ideal for auto-populating city and state fields in web forms.

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

country ISO country code for the zip code, typically US.
state Full name of the US state for this zip code.
state_short Two-letter abbreviation of the US state.
city Primary city name associated with the zip code.
timezone IANA timezone identifier for the zip code area.

Implementation Example

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

Request
const url = "https://ziptasticapi.com/90210";
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.

404 Not Found The zip code does not exist or is not in the Ziptastic database.
Confirm the zip code is a valid 5-digit US postal code. Some newer or rural zip codes may be missing.
Empty or unexpected response Non-numeric characters were included in the zip code.
Strip all formatting (spaces, dashes) and send only the 5-digit numeric zip code in the URL path.
CORS error in browser The browser is blocking the cross-origin request.
Ziptastic supports CORS, but make sure you are calling it from a standard http/https page, not a local file:// URL.

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 UNKNOWN
Category Geocoding
Difficulty Beginner
Listing details not endpoint-verified

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