A Val Town service that converts latitude and longitude coordinates to geohash with configurable precision. Features both a user-friendly web interface and a REST API.

Visit the root URL to access the interactive web interface with:

• Easy-to-use form with latitude, longitude, and precision inputs
• 5 sample locations you can click to auto-fill the form:
  • 🗽 New York City (40.7128, -74.0060)
  • 🌉 San Francisco (37.7749, -122.4194)
  • 🏰 London (51.5074, -0.1278)
  • 🗼 Tokyo (35.6762, 139.6503)
  • 🏄 Sydney (-33.8688, 151.2093)
  • 🗼 Paris (48.8566, 2.3522)
• Real-time conversion with beautiful results display
• Copy-to-clipboard functionality for generated geohashes
• Responsive design that works on desktop and mobile

• Convert lat/lng coordinates to geohash
• Configurable precision (1-12 characters)
• Returns bounding box for the generated geohash
• Supports both GET and POST requests
• Input validation and error handling

GET /geohash?lat=40.7128&lng=-74.0060&precision=8

Parameters:

• lat (required): Latitude (-90 to 90)
• lng (required): Longitude (-180 to 180)
• precision (optional): Geohash precision (1-12, default: 8)

POST /geohash
Content-Type: application/json

{
  "lat": 40.7128,
  "lng": -74.0060,
  "precision": 8
}

{
  "geohash": "dr5regw3",
  "lat": 40.7128,
  "lng": -74.006,
  "precision": 8,
  "bbox": {
    "minLat": 40.7127571105957,
    "maxLat": 40.712928771972656,
    "minLng": -74.00630950927734,
    "maxLng": -74.00596618652344
  }
}

Geohash precision determines the accuracy of the location:

curl "https://your-val.web.val.run/geohash?lat=40.7128&lng=-74.0060&precision=8"
# Returns: "dr5regw3"

curl -X POST "https://your-val.web.val.run/geohash" \
  -H "Content-Type: application/json" \
  -d '{"lat": 37.7749, "lng": -122.4194, "precision": 10}'
# Returns: "9q8yyk8ytp"

curl "https://your-val.web.val.run/geohash?lat=51.5074&lng=-0.1278&precision=6"
# Returns: "gcpuvp"

The API returns appropriate HTTP status codes and error messages:

• 400 Bad Request: Invalid parameters or missing required fields
• 405 Method Not Allowed: Unsupported HTTP method

Example error response:

{
  "error": "Invalid request",
  "message": "Latitude must be a number between -90 and 90"
}

Geohash is a geocoding system that represents geographic coordinates as a short alphanumeric string. It has several useful properties:

• Hierarchical: Longer geohashes are more precise
• Proximity: Similar geohashes are geographically close
• Compact: Efficient string representation of coordinates
• Base32: Uses characters 0-9 and b-z (excluding a, i, l, o)

This implementation uses the standard geohash algorithm:

1. Interleaves longitude and latitude bits
2. Encodes using base32 character set
3. Provides bounding box calculation for reverse lookup
4. Validates input coordinates and precision values