M
API Matrix

Ducks Unlimited API

Geocoding / No Auth Required Beginner HTTPS
Free to Use Varies (check documentation)
79 Score
Grade B
Visit Official Site Compare Alternatives

Overview

The Ducks Unlimited API provides location data for university chapters affiliated with Ducks Unlimited, the wetlands and waterfowl conservation organization. It returns GeoJSON-compatible location data for chapters across cities and states. No authentication is needed, making it easy to query directly.

💡

Beginner Tip

This is an ArcGIS-based API; the query parameter "where=1=1" returns all records. You can filter by adding conditions like "where=STATE='TX'" to get chapters in a specific state.

Available Data

Ducks Unlimited data via REST API
JSON-formatted response data
Freely accessible without authentication

Example Response

JSON Response 
{
  "status": "success",
  "data": {
    "result": "Data from Ducks Unlimited",
    "description": "API explorer that gives a query URL with a JSON response of locations and cities",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

features Array of feature objects, each representing a university chapter location.
attributes Key-value pairs of chapter data fields such as name, city, state, and contact info.
geometry Coordinates object with x (longitude) and y (latitude) values for the chapter location.
geometryType Type of geometry returned (e.g., "esriGeometryPoint" for point locations).
objectIdFieldName Name of the field used as a unique identifier for each feature in the dataset.

Implementation Example 

// ⚠️ Note: This URL may be a documentation page. Check official docs for actual API endpoint.
const url = "https://gis.ducks.org/datasets/du-university-chapters/api";
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

Empty features array The "where" query parameter syntax is incorrect or the filter matches no records.
✓ Use "where=1=1" to return all records first, then refine your filter. URL-encode special characters like = as %3D.
400 Bad Request Missing the "f" (format) parameter in the query string.
✓ Always include "f=json" in your query parameters to specify JSON output format.
Unexpected response structure ArcGIS APIs wrap data in a "features" array with nested "attributes" and "geometry" objects.
✓ Access data via response.features[0].attributes for field values and response.features[0].geometry for location data.

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 15/20
🔒 Security 15/15
🛠 Developer XP 12/20
✓ Reliability 7/15
Response Time 248ms

Fully tested on Apr 5, 2026

How is this scored? →

Technical Specifications

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

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