A
APIs Score

Ziptastic API

Beginner's Pick Geocoding / No Auth Required Beginner HTTPS
Free to Use Varies (check documentation)
87 A
Metadata Score 0 50 100 Metadata estimate · not endpoint-tested
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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

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

Example Response

JSON Response 
{
  "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

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

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

How is this scored? →

Technical Specifications

Auth No Auth
HTTPS REQUIRED
CORS UNKNOWN
Category Geocoding
Difficulty Beginner
Verified: 2026-04-04

Related Tags

#geocoding

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