Developer's Barcode Generator Creates Invalid Labels Due to Check Digit Error

·3 views

A developer added EAN-13 barcode generation to an existing service two months ago. The system generated barcodes without validating the required check digit, which is a calculated verification digit in the EAN-13 standard. When a partner used actual retail scanners in a warehouse, every label was rejected as an invalid read, though phone apps decoded them. The developer fixed the issue by adding strict validation rules to ensure correct check digits are generated. They emphasized that leniency in generation only shifts failures to end-users, highlighting the barcode as a contract between producer and reader.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

Uncapped Feed Limits Caused Dev.to to Dominate Data Collection

A developer noticed Dev.to articles made up over 30% of their weekly data collection, totaling 58 items. The issue was traced to their feed configuration lacking a maximum entry limit per source. The developer resolved this by adding a "max_entries": 5 rule to the Dev.to feed in their sources.json file. The following week, Dev.to's share dropped to 8%, creating a more balanced dataset. This experience highlights how omitting collection limits can introduce unintended bias, especially from high-volume platforms.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Radware launches Thailand cloud security center, highlights evolving cyber threat landscape

Radware launched a new cloud security service center in Thailand at an event in Bangkok on October 8, 2026. The company claims a global mitigation capacity of 40 Tbps and over 60 security centers worldwide. The launch presentation detailed sophisticated threats like credential-stuffing bots and business logic abuse that evade traditional security signatures. These attacks use valid API calls to conduct fraud and data theft without triggering standard alarms. The analysis advises businesses to focus on behavioral detection and review their API security and data residency policies.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Radware launches Thailand cloud security center, emphasizes behavioral threat detection

Radware held an event on October 8, 2026, at the Ritz-Carlton Bangkok to launch a new Thailand cloud security service center. The company presented slides claiming 1,200 employees and over 60 global cloud security centers. A key theme was the need for behavioral analysis to detect credential-based attacks that bypass traditional signature-based security tools. The presentation also warned of business logic abuse, where valid API calls are manipulated to exploit application workflows.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Developer shares lessons from shipping three functional AI side project MVPs

A developer initially struggled with building elaborate but unused AI demos, almost abandoning a project after three weeks of work. Realizing the need for simplicity and focus, the developer changed their approach to prioritize core functionality over technical sophistication. In the last two months, the developer has successfully shipped three minimal viable products, including a browser extension for concise text rewriting and a Telegram bot for converting voice notes to task lists. The key lesson is that solving a specific user problem with minimal friction is more important than complex AI architecture for an MVP. The developer advises others to constrain the problem and focus on user flow rather than model complexity.

0 comments Read more at DEV Community