checkdigit
A Go library implementing check digit algorithms (Luhn, Verhoeff, Damm) and calculators for ISBN, EAN, JAN, UPC, and other standards.
What is checkdigit?
checkdigit is a Go library that implements various check digit algorithms and calculators for validating and generating check digits. It solves the problem of ensuring data integrity in systems that handle standardized numbers like ISBNs, barcodes, and product codes by providing reliable, ready-to-use implementations.
Go developers building applications that require validation of identification numbers, barcodes, ISBNs, or other product codes, such as e-commerce systems, inventory management, or library software.
Developers choose checkdigit because it offers a comprehensive, well-tested collection of check digit algorithms in a single, lightweight Go library, saving time and reducing errors compared to custom implementations.
Overview
Provide check digit algorithms and calculators written in Go
Use Cases
Best For
- Validating ISBN numbers in book management systems
- Generating check digits for EAN or UPC barcodes in retail applications
- Implementing error detection for identification numbers using the Verhoeff algorithm
- Adding data integrity checks to inventory or shipping systems with SSCC codes
- Ensuring accuracy in financial or ID numbers with the Luhn algorithm
- Building Go services that require robust check digit validation for various standards
Not Ideal For
- Projects developed in programming languages other than Go
- Applications requiring real-time barcode image scanning or OCR functionality
- Systems needing custom or proprietary check digit algorithms not included in the library
Pros & Cons
Pros
Implements Luhn, Verhoeff, and Damm algorithms, covering common error-detection needs from credit cards to secure decimal checks, as listed in the README.
Includes calculators for ISBN-10, ISBN-13, EAN, JAN, ITF, UPC, and SSCC, making it versatile for product and identification code validation, as detailed in the provided methods.
Backed by continuous integration (CI badge), high test coverage (codecov badge), and a good Go Report Card, ensuring reliability and minimal bugs.
GoDoc provides clear examples for usage, allowing developers to quickly implement check digit functionality without extensive trial and error.
Cons
Only applicable for Go projects, limiting its use in polyglot environments or for teams using other programming languages.
The README is brief and relies heavily on external godoc for examples, which may lack detailed tutorials or edge-case explanations.
Focuses on standard algorithms; adding non-standard or proprietary check digit methods requires significant customization or forking the library.
Frequently Asked Questions
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