flutter_nominatim

flutter_nominatim

Completely Free & Open Source! Unlike other geocoding services, Nominatim is 100% free to use with NO API key required. You can start implementing location features in your app immediately without any payment or API key setup.

Example Screenshots 📸

Place Search	Convert LatLng to Address	Convert Address to LatLng
Auto-complete search with realtime results	Convert coordinates to human-readable address	Convert address to geographical coordinates

Key Benefits

Feature	Description	Benefit
💰 Free Forever	No API key, no pricing tiers	Save hundreds of dollars compared to paid geocoding services
🔑 No Authentication	No API keys or tokens needed	Quick implementation without setup hassle
🌍 Global Coverage	Worldwide address database	Works everywhere your app does
🚀 Easy Integration	Simple API methods	Get started in minutes
⚡ Performance Optimized	Built-in rate limiting & caching	Smooth user experience

Features Overview

1. Place Search 🔍

• Auto-complete with debouncing
• Real-time results as you type
• Most relevant matches
• Rich place details
• Polygon Boundaries for places

2. Geocoding Services

Service	Description	Example
Forward Geocoding	Convert address to coordinates	"London Bridge" → (51.5074, -0.1278)
Reverse Geocoding	Convert coordinates to address	(51.5074, -0.1278) → "London Bridge, London, UK"

3. Built-in Optimizations

• Automatic request debouncing
• Rate limit handling
• Error management
• Input validation

Quick Start

Installation

dependencies:
  flutter_nominatim: ^1.0.0

Basic Usage

// Initialize
final nominatim = Nominatim.instance;

// Search places
final results = await nominatim.search("London");

// Get address from coordinates
final address = await nominatim.getAddressFromLatLng(51.5074, -0.1278);

// Get coordinates from address
final coordinates = await nominatim.getLatLngFromAddress("London Bridge");

Implementation Examples

Auto-complete Search Widget

TextField(
  controller: searchController,
  decoration: const InputDecoration(
    hintText: 'Search places...',
    prefixIcon: Icon(Icons.search),
  ),
  onChanged: (query) {
    if (query.length >= 3) {
      nominatim.search(query).then((results) {
        // Handle results
      });
    }
  },
)

Usage Guidelines

Input Constraints

Parameter	Range/Format	Example
Latitude	-90 to 90	51.5074
Longitude	-180 to 180	-0.1278
Search Query	Min 3 characters	"London"

Rate Limiting

• Maximum 1 request per second
• Built-in request management
• Automatic request queuing

Why It's Free & Open

Nominatim is powered by OpenStreetMap, the world's largest collaborative mapping project. This means:

• 🆓 Completely Free: No hidden costs or subscription fees
• 🔓 No API Key Required: Start developing immediately
• 🌐 Community Driven: Regular updates from global contributors
• 📈 Constantly Improving: Database grows and improves daily

Attribution Requirements

When using this plugin, include:

© OpenStreetMap contributors

Support & Contribution

We welcome:

• 🐛 Bug reports
• 💡 Feature suggestions
• 🤝 Pull requests
• 📖 Documentation improvements

License

MIT License - feel free to use in your projects!

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