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geodb-rs

Author: Holger Trahe | License: MIT (Code) / CC-BY-4.0 (Data)

Crates.io

PyPI

pub.dev (Flutter)

App Store

A high-performance, pure-Rust geographic database with countries, states/regions, cities, aliases, phone codes, currencies, timezones, and multi-platform support including WebAssembly, iOS, macOS, watchOS, and Android.

This repository is a Cargo workspace containing:

geodb-core — main geographic database library (published on crates.io) — docs: https://docs.rs/geodb-core
geodb-cli — command-line interface — docs: https://docs.rs/geodb-cli
geodb-wasm — WebAssembly bindings + browser demo — docs: https://docs.rs/geodb-wasm
geodb-py — Python bindings (published on PyPI as "geodb-rs") — https://pypi.org/project/geodb-rs/
geodb-ffi — FFI bindings for mobile platforms (iOS, macOS, watchOS, Android)
geodb_flutter — Flutter plugin (published on pub.dev) — https://pub.dev/packages/geodb_flutter

Overview

geodb-core provides:

🚀 Fast loading from compressed JSON or binary cache
💾 Automatic caching based on dataset file and filters
🔎 Flexible lookups: ISO codes, names, aliases, phone codes
🌍 Countries, states/regions, cities, populations
🗺 Accurate metadata: region, subregion, currency
📞 Phone code search
⏱ Zero-copy internal model
🦀 Pure Rust — no unsafe
🕸 WASM support via geodb-wasm
📱 Mobile support via geodb-ffi (iOS, macOS, watchOS, Android)

The dataset is adapted from https://github.com/dr5hn/countries-states-cities-database (licensed under CC-BY-4.0, attribution required).

Important: Data source and automatic downloading

geodb-core uses the upstream dataset from the dr5hn/countries-states-cities-database repository:

https://github.com/dr5hn/countries-states-cities-database/blob/master/json/countries%2Bstates%2Bcities.json.gz

Automatic data download and caching:

The published crate does NOT include data files (keeps package size under 1MB)

On first load, the library automatically downloads the dataset from GitHub (~3.7MB)

After download, a binary cache is generated for fast subsequent loads

Download and cache generation happen only once per system

Requires the builder feature (enabled by default) and internet connection for first load

Downloaded data and cache stored in crates/geodb-core/data/ directory

If you update or replace the dataset, ensure it retains the same JSON structure. Please observe the CC-BY-4.0 license and attribution of the upstream project.

Installation

For Rust applications

[dependencies]
geodb-core = "0.1"

Note: First load will download the dataset from GitHub (~3.7MB) and build the binary cache (requires internet connection). Subsequent loads will be instant using the cached binary.

For WebAssembly (browser/Node)

[dependencies]
geodb-wasm = "0.1"

For Swift (iOS, macOS, watchOS)

Add the Swift Package via git URL:

// In Xcode: File → Add Package Dependencies
// URL: https://github.com/holg/geodb-rs

// Or in Package.swift:
dependencies: [
    .package(url: "https://github.com/holg/geodb-rs", from: "1.0.0")
]

Then import and use:

import GeodbKit

let engine = try GeoDbEngine()
let stats = engine.stats()
print("Countries: \(stats.countries), States: \(stats.states), Cities: \(stats.cities)")

// Search
let results = engine.smartSearch(query: "Berlin")
for city in results {
    print("\(city.name), \(city.state), \(city.country)")
}

// Find nearest cities
let nearest = engine.findNearest(lat: 52.52, lng: 13.405, count: 10)

For Flutter (iOS, Android, macOS)

# pubspec.yaml
dependencies:
  geodb_flutter: ^0.1.8

import 'package:geodb_flutter/geodb_flutter.dart';

final geodb = GeodbFlutter();
await geodb.initialize();

final results = await geodb.smartSearch('Berlin');
final nearest = await geodb.findNearest(lat: 52.52, lng: 13.405, count: 10);

For Android (Kotlin - Native)

See the example app in GeoDB-App/android-app/. The app uses UniFFI-generated Kotlin bindings.

import uniffi.geodb_ffi.GeoDbEngine

val engine = GeoDbEngine()
val stats = engine.stats()
println("Countries: ${stats.countries}, States: ${stats.states}, Cities: ${stats.cities}")

// Search
val results = engine.smartSearch("Berlin")
results.forEach { city ->
    println("${city.name}, ${city.state}, ${city.country}")
}

// Find nearest cities
val nearest = engine.findNearest(52.52, 13.405, 10u)

Quick Start

use geodb_core::prelude::*;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let db = GeoDb::<StandardBackend>::load()?;

    if let Some(country) = db.find_country_by_iso2("US") {
        println!("Country: {}", country.name());
        println!("Capital: {:?}", country.capital());
        println!("Phone Code: {}", country.phone_code());
        println!("Currency: {}", country.currency());
    }

    Ok(())
}

Loading & Caching

Default loading

Loads from:

geodb-core/data/countries+states+cities.json.gz

Creates automatic cache:

countries+states+cities.json.ALL.bin

let db = GeoDb::<StandardBackend>::load()?;

Load from a custom file

let db = GeoDb::<StandardBackend>::load_from_path(
    "path/to/worlddata.json.gz",
    None,
)?;

Cache becomes:

worlddata.json.ALL.bin

Filtered loading (ISO2)

let db = GeoDb::<StandardBackend>::load_filtered_by_iso2(&["DE", "US"])?;

Cache:

countries+states+cities.json.DE_US.bin

Cache rules:

<dataset_filename>.<filter>.bin

Usage Examples

List all countries

use geodb_core::prelude::*;

let db = GeoDb::<StandardBackend>::load()?;
for country in db.countries() {
    println!("{} ({})", country.name(), country.iso2());
}

Find by ISO code

if let Some(country) = db.find_country_by_iso2("DE") {
    println!("Found {}", country.name());
}

Country details

if let Some(fr) = db.find_country_by_iso2("FR") {
    println!("Capital: {:?}", fr.capital());
    println!("Currency: {}", fr.currency());
    println!("Region: {}", fr.region());
}

States & cities

if let Some(us) = db.find_country_by_iso2("US") {
    let states = us.states();
    if let Some(ca) = states.iter().find(|s| s.state_code() == "CA") {
        for city in ca.cities() {
            println!("{}", city.name());
        }
    }
}

Phone search

let countries = db.find_countries_by_phone_code("+44");

Filter-based city search (CityQuery API)

Use the chainable query_cities() API to disambiguate cities with common names:

use geodb_core::prelude::*;

let db = GeoDb::<DefaultBackend>::load()?;

// Find Springfield in Illinois, US (not the 30+ other Springfields!)
let results = db.query_cities()
    .filter_country("US")
    .filter_region("Illinois")
    .filter_city("Springfield")
    .collect();

assert_eq!(results.len(), 1);
let (city, state, country) = &results[0];
println!("{} - {}, {}", city.name(), state.name(), country.iso2());
// Output: Springfield - Illinois, US

// Find Lüdinghausen in NRW (accent-insensitive search)
let city = db.query_cities()
    .filter_country("DE")
    .filter_region("Nordrhein-Westfalen")
    .filter_city("Ludinghausen")  // works without umlaut too
    .first();

// Count all Springfields worldwide
let count = db.query_cities()
    .filter_city("Springfield")
    .count();
println!("Found {} cities named Springfield", count);

Filters support:

Country: ISO2/ISO3 codes ("US", "DEU") or name substring ("Germany")
Region: State code ("CA", "NW") or name ("California", "Nordrhein-Westfalen")
City: Name substring with accent-insensitive matching

WebAssembly (`geodb-wasm`)

Exports:

search_country_prefix
search_countries_by_phone
search_state_substring
search_city_substring
smart_search
get_stats

To run locally:

cd crates/geodb-wasm
cargo install trunk
trunk serve

Live demos:

Search Demo: https://trahe.eu/geodb-rs.html
Performance Benchmark: https://trahe.eu/geodb-bench.html

Command-line interface (`geodb-cli`)

The CLI is finished and available on crates.io. It provides quick access to the database for exploration, scripting, or data checks.

Install:

cargo install geodb-cli

Commands:

geodb-cli --help                    # Show all commands
geodb-cli stats                     # Database statistics
geodb-cli countries                 # List all countries
geodb-cli country US                # Lookup country by ISO2/ISO3 code
geodb-cli states US                 # List all states for a country
geodb-cli cities "Springfield"      # Search cities by substring
geodb-cli smart "Berlin"            # Smart search (cities/states/countries)
geodb-cli nearest --lat 52.52 --lng 13.405 -n 5   # Find 5 nearest cities
geodb-cli radius --lat 52.52 --lng 13.405 -r 50   # Cities within 50km

Filter-based query (disambiguate cities):

# Find Springfield in Illinois, US (not the 30+ other Springfields!)
geodb-cli query --city Springfield --country US --region Illinois

# Find Lüdinghausen in NRW, Germany
geodb-cli query --city "Lüdinghausen" --country DE --region "Nordrhein-Westfalen"

# List all cities in Bavaria
geodb-cli query --country Germany --region Bavaria -n 50

Docs.rs: https://docs.rs/geodb-cli

Python bindings (`geodb-py`)

Package name on PyPI: geodb-rs https://pypi.org/project/geodb-rs/
Module to import in Python: geodb_rs
Built and published wheels for these targets:

          - os: ubuntu-latest
            target: x86_64
            manylinux: auto
          - os: ubuntu-latest
            target: aarch64
            manylinux: auto
          - os: macos-13
            target: x86_64
            manylinux: ""
          - os: macos-14
            target: aarch64
            manylinux: ""
          - os: windows-latest
            target: x64
            manylinux: ""

Quick start:

import geodb_rs

db = geodb_rs.PyGeoDb.load_default()  # tries bundled data first
print(db.stats())  # (countries, states, cities)

Flutter Plugin (`geodb_flutter`)

Cross-platform Flutter plugin with native Rust performance.

pub.dev

Installation

dependencies:
  geodb_flutter: ^0.1.8

Platform Support

Platform	Status	Architectures
iOS	Ready	arm64 device, arm64 simulator
macOS	Ready	arm64, x86_64 (Universal)
Android	Ready	arm64-v8a, armeabi-v7a, x86_64, x86

Quick Start

import 'package:geodb_flutter/geodb_flutter.dart';

final geodb = GeodbFlutter();

// Initialize (required first)
await geodb.initialize();

// Get stats
final stats = await geodb.getStats();
print('${stats.cities} cities in ${stats.countries} countries');

// Smart search
final results = await geodb.smartSearch('Berlin');
for (final city in results) {
  print('${city.name}, ${city.country} (${city.iso2})');
}

// Find nearest cities
final nearest = await geodb.findNearest(lat: 52.52, lng: 13.405, count: 10);

// Search within radius
final nearby = await geodb.findInRadius(lat: 52.52, lng: 13.405, radiusKm: 50.0);

For a complete example, see GeoDB-Apps/geodb_city_autocomplete/ in the repository.

Mobile Apps (`GeoDB-App`)

The repository includes native apps for Apple and Android platforms:

App Store & Downloads

Platform	Status	Link
iOS	Available	App Store
macOS	In Review	Coming soon
tvOS	In Review	Coming soon
watchOS	Available	Included with iOS app
TestFlight	Available	Join Beta

iOS / macOS / watchOS / tvOS (Swift)

Located in GeoDB-App/GeoDB/ - a universal Xcode project supporting:

iOS app - Available on App Store
macOS app - In Apple Review
tvOS app - In Apple Review
watchOS app (including Apple Watch Ultra support with arm64_32)

Uses the GeodbKit Swift package via SPM.

Android (Kotlin)

Located in GeoDB-App/android-app/ - a Jetpack Compose app featuring:

Text search for cities, states, countries
Nearest city search by coordinates
Radius search
Interactive detail dialogs

Pre-built APKs available in releases/android/:

app-arm64-v8a-release.apk (15 MB) - Most modern Android phones
app-armeabi-v7a-release.apk (14 MB) - Older 32-bit phones
app-x86_64-release.apk (15 MB) - Emulators
app-universal-release.apk (40 MB) - All architectures

Workspace Layout

geodb-rs/
├── crates/
│   ├── geodb-core/        # Core Rust library
│   ├── geodb-cli/         # Command-line interface
│   ├── geodb-wasm/        # WebAssembly bindings
│   ├── geodb-py/          # Python bindings
│   └── geodb-ffi/         # FFI bindings (mobile)
├── GeoDB-App/
│   ├── GeoDB/             # Xcode project (macOS/iOS/watchOS)
│   ├── android-app/       # Android Kotlin app
│   ├── spm/               # Swift Package (GeodbKit)
│   │   ├── Package.swift
│   │   ├── GeodbFfi.xcframework/
│   │   └── Sources/
│   └── scripts/           # Build scripts
├── releases/
│   └── android/           # Pre-built APKs
├── Package.swift          # Root SPM package (for git URL install)
├── scripts/               # Development scripts
└── README.md

Performance

Initial load from JSON: ~20-40ms
Cached load: ~1-3ms
Memory use: 10-15MB
Fully zero-copy internal model

Building from Source

Rust crates

cargo build --workspace
cargo test --workspace

Swift Package (XCFramework)

cd GeoDB-App/scripts
./build_spm_package.sh

Android native libraries

# Requires cargo-ndk and Android NDK
cargo ndk -t arm64-v8a -t armeabi-v7a -t x86_64 -t x86 \
    -o GeoDB-App/android-app/app/src/main/jniLibs \
    build --release -p geodb-ffi

Contributing

Before submitting PRs:

cargo fmt
cargo clippy --all-targets -- -D warnings
cargo test --workspace
cargo doc --workspace
cargo sort -cwg
taplo format --check
cargo deny check

License

Code

MIT License.

Data Attribution (Required)

This project includes data from:

countries-states-cities-database https://github.com/dr5hn/countries-states-cities-database Licensed under Creative Commons Attribution 4.0 (CC-BY-4.0). Attribution is required if you redistribute or use the dataset.

geodb-wasm 0.1.6

geodb-rs

Crates.io

PyPI

pub.dev (Flutter)

App Store

Overview

Installation

For Rust applications

For WebAssembly (browser/Node)

For Swift (iOS, macOS, watchOS)

For Flutter (iOS, Android, macOS)

For Android (Kotlin - Native)

Quick Start

Loading & Caching

Default loading

Load from a custom file

Filtered loading (ISO2)

Usage Examples

List all countries

Find by ISO code

Country details

States & cities

Phone search

Filter-based city search (CityQuery API)

WebAssembly (geodb-wasm)

Command-line interface (geodb-cli)

Python bindings (geodb-py)

Flutter Plugin (geodb_flutter)

pub.dev

Installation

Platform Support

Quick Start

Mobile Apps (GeoDB-App)

App Store & Downloads

iOS / macOS / watchOS / tvOS (Swift)

Android (Kotlin)

Workspace Layout

Performance

Building from Source

Rust crates

Swift Package (XCFramework)

Android native libraries

Contributing

Before submitting PRs:

License

Code

Data Attribution (Required)

Links

Source & Documentation

Package Registries

Live Demos

App Downloads

WebAssembly (`geodb-wasm`)

Command-line interface (`geodb-cli`)

Python bindings (`geodb-py`)

Flutter Plugin (`geodb_flutter`)

Mobile Apps (`GeoDB-App`)