Coordinate Validation
Reject invalid inputs at the library boundary before calculation.
← Case-study library
Developer Tooling
Precise Locations
Reusable coordinate validation and distance calculations.
- Rodent role
- Library Architecture + Release Engineering
- Project type
- Open Source
- Scope
- Open source Node.js package for precise location operations.
The context
Why this system exists.
Precise Locations packages coordinate operations behind a small typed interface. The public repository and release history make the implementation inspectable and demonstrate reusable API and release engineering.
The problem
The operational or engineering gap.
Applications working with coordinates needed reusable validation and distance calculations instead of implementing them repeatedly.
Key requirements
What the system needed to make possible.
- ✓ Coordinate input validation
- ✓ Distance calculation
- ✓ Typed public functions
- ✓ Reusable package interface
- ✓ Versioned distribution
- ✓ Automated release checks
- ✓ Public source repository
What Rodent built
A system, not a framework demonstration.
Rodent built a typed Node.js library that checks coordinate input, calculates distance, and packages those functions for reuse.
Capabilities delivered
The working parts of the product.
Distance Calculation
Expose reusable location-distance operations to consuming applications.
Typed API
Make inputs and results explicit for TypeScript consumers.
Package Distribution
Bundle functionality for reuse instead of copying implementation between products.
Versioning
Communicate release changes through semantic versions.
Release Automation
Use repository automation to verify and publish package changes.
System architecture
Responsibilities separated into understandable layers.
- 01Typed Node.js library core
- 02Validation boundary
- 03Automated release pipeline
- 04GitHub/npm distribution
Data / process flow
How information moves through the system.
- 01Input Coordinates → Validation
- 02Validated Data → Distance Engine
- 03Distance Results → Consumer APIs
- 04Package Releases → npm/GitHub
Engineering decisions
Choices explained in operational terms.
Small Public API
Focused functions reduce integration overhead and keep location behaviour predictable.
Validate at the Boundary
Coordinates are checked before calculation so consumers receive explicit failures instead of misleading output.
Automated Releases
GitHub Actions and semantic versioning provide a repeatable package-release path.
Engineering challenges
Constraints addressed without inflated claims.
A dependable public boundary
Small typed functions make invalid input and downstream use easier to reason about.
Reuse across applications
Packaging and versioning separate the utility from any one product codebase.
Technology in context
Tools selected to support the system.
Technology supports the product’s interfaces, data and release path. It is part of the engineering explanation, not the outcome itself.
Outcome
A demonstrable result, without invented metrics.
The source and release history are publicly available for developers to inspect and use.
Provided a reusable geospatial toolkit for coordinate-driven applications.Related services
Capabilities behind this project.
Build something similar
Need a system with similar capabilities?
Tell Rodent about the operational problem, users and constraints—not just the technology you think you need.