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ProgrammingDEV Community ·

Developer Builds VidFixa, a Multi-Platform Video Downloader Using Go, Nuxt and PostgreSQL

A developer built and launched VidFixa, a video downloader supporting Instagram, TikTok, Facebook, X, and LinkedIn, as a hands-on learning project rather than a typical tutorial exercise. The application allows users to paste a video URL and download the content without a watermark, with the backend powered by Go and Chi, the frontend by Nuxt, and PostgreSQL for data storage. Video processing relies on yt-dlp and FFmpeg, while background workers handle download jobs asynchronously to avoid blocking HTTP requests. VidFixa offers three subscription tiers — Free, Plus, and Pro — with monthly download limits enforced for both anonymous and registered users, and payments managed through Bachs. The project is open-source on GitHub and deployed on Render, with the developer navigating real-world challenges including Docker configuration, CORS setup, webhook integration, and environment-specific deployment issues.

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ProgrammingDEV Community ·

How to test n8n webhook workflows locally without triggering live APIs

Developers at Weio, Inc. have outlined a method for testing n8n webhook workflows without making real calls to services like WhatsApp, Google Sheets, or Slack. The approach centers on adding a dry_run flag to webhook requests, which a Switch node uses to route traffic either to real action nodes or directly to a response node. All business logic is isolated inside a single Code node that returns a plain object, making it independently testable through fixture JSON files and CLI assertions. The pattern also covers running n8n in a temporary Docker container for isolated test environments, with specific warnings about timing traps such as waiting for full database readiness before importing workflows. Common CLI pitfalls around workflow activation in non-queue mode are also documented to help teams avoid silent failures during automated test runs.

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ProgrammingDEV Community ·

CS50P 'Einstein' Problem Teaches Python Variables and E=mc² Calculation

A developer advocate walking through Harvard's CS50P course has shared insights from solving the 'Einstein' problem in Problem Set 0, which involves coding Einstein's mass-energy equivalence formula E=mc². The exercise requires learners to accept a user-input mass value, assign the speed of light as a variable, and multiply them correctly to compute energy. A key detail highlighted is that the speed of light must be squared, meaning it is multiplied by itself in the calculation. The author also recaps a prior lesson on Python's chained string replacement method, showing how multiple substitutions can be performed in a single line of code. The series aims to guide learners through CS50P problems with hints rather than direct answers, encouraging independent problem-solving.

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ProgrammingDEV Community ·

How to Diagnose and Fix 'Your Connection Is Not Private' Errors Fast

A small AI-operations firm in Santa Barbara audited 18 small-business websites in one California county and found all displayed Chrome's 'Your connection is not private' error, blocking visitors entirely. Fourteen sites had expired SSL certificates flagged as NET::ERR_CERT_DATE_INVALID, while four had name-mismatch errors where the certificate covered only one version of the domain. The most common root causes are a silent renewal failure or a certificate that omits either the bare domain or the www variant. Technicians can identify the exact issue in minutes using OpenSSL commands to inspect certificate dates, subject alternative names, and issuer details. Fixes typically take around 15 minutes and involve re-running AutoSSL in cPanel or using Certbot on a VPS to renew or reissue the certificate with the correct domain names included.

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ProgrammingDEV Community ·

Power BI Dashboard Reveals KSh 1.35B Revenue and Key Gaps for JCARS Logistics Kenya

A data analyst built a Power BI dashboard to assess the business performance of JCARS Logistics, a Kenyan vehicle importer and distributor. The analysis, based on a cleaned star-schema dataset, shows total revenue of KSh 1.35 billion from 466 units sold, with a gross profit of KSh 515.45 million and a 30% gross margin. Rift Valley led all regions in unit sales, while top sales representatives Aisha Mohammed, Grace Njeri, and Brian Otieno drove a disproportionate share of volume. Key challenges identified include heavy reliance on Toyota vehicles, underperformance in major urban markets like Nairobi, data entry gaps flagged by an 'Unknown' region entry, and operational risk from dependence on a small number of sales staff.

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ProgrammingDEV Community ·

How a reservation ledger solves multichannel overselling better than availability formulas

Multichannel overselling is fundamentally a concurrency problem, not a data accuracy issue, meaning real-time availability calculations are prone to race conditions when multiple sales channels query stock simultaneously. A more reliable approach uses an append-only stock movement ledger where reservations are written as database rows with explicit locks, ensuring only one channel can claim a unit at a time. Each reservation must carry a time-to-live expiry to automatically release stock from abandoned checkouts or failed payments, preventing indefinite inventory lockup. Multi-SKU orders must lock rows in a consistent, deterministic sequence to avoid deadlocks, which become critical during high-traffic events like promotions. The method is used in production across three fulfillment warehouses in Shenzhen, Suzhou, and Dongguan, where site-level stock segregation prevents overselling inventory that is physically located far from the destination order.

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ProgrammingDEV Community ·

How to Build a Shipment Exception Queue With Deduplication and Aging

Most ecommerce backends track shipments using a simple status column, which fails to surface quiet operational problems like parcels stalled in a depot for days. A developer writing on DEV Community proposes a dedicated shipment_exception database table with its own lifecycle, severity levels, and state transitions from open to resolved. The key design feature is a unique constraint on shipment ID and a dedupe key, which prevents carrier webhooks from flooding the queue with duplicate entries for the same issue. Because carriers send no webhook for inactivity, a scheduled database sweep detects silence by comparing each shipment's last scan time against a per-lane configurable budget. The approach keeps exception queues actionable and idempotent without requiring a separate deduplication service.

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ProgrammingDEV Community ·

IdentiFlows.dev Launches as Visual Reference Tool for OAuth and Identity Protocols

A developer, backed by Auth0, has launched IdentiFlows.dev, a website designed to give developers and architects quick visual access to sequence diagrams for common identity protocols. The platform currently covers eight flows across four categories, including OAuth 2.0, OpenID Connect, SAML 2.0, and DPoP, each with an introduction, a sequence diagram, and a step-by-step breakdown. An interactive mode lets users walk through each flow stage by stage, going beyond static diagrams. The project is described as an early release, with additional flows such as OAuth 2.0 Client Credentials, Device Authorization, and WebAuthn planned for the near future. The creator is actively seeking feedback from users before the platform's structure becomes more fixed.

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ProgrammingDEV Community ·

A Step-by-Step Checklist for Diagnosing Broken API Requests Using Browser Tools

A developer-focused guide outlines a structured approach to debugging common API request failures, including 401, 400, and empty response errors. The checklist recommends first isolating the request using curl to determine whether the issue lies in the API or the calling code. It then walks through interpreting HTTP status codes, decoding JWT tokens locally to check expiry and audience fields, and correctly encoding URL parameters. The guide also cautions against pasting live credentials or production tokens into online tools, advising the use of test values or local alternatives instead. Each step is paired with reusable code snippets to make troubleshooting faster and more systematic.

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ProgrammingDEV Community ·

Developer Releases Free Open-Source J1939 CAN Bus Emulator to Replace Costly Tools

A developer has published an open-source J1939 CAN bus ECU emulator on GitHub, designed to replace expensive commercial tools like Vector CANoe that can be prohibitive for startups and solo developers. The emulator is built on Python's python-can library and runs as both a CLI and a browser-based GUI compatible with Windows, Linux, and macOS. It supports core J1939 protocol features including PGN broadcast, DTC injection, VIN transmission, and address claiming, with configurable timing throughout. The tool can run inside a Docker container, making it compatible with CI/CD pipelines and cloud-based integration testing, and requires no physical CAN hardware thanks to virtual bus support. The project also includes a YouTube tutorial series and documentation aimed at helping developers learn J1939 protocol internals without prior deep expertise.

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ProgrammingHacker News ·

Most Data Centers Withhold Water and Electricity Consumption Figures

A majority of data centers are declining to disclose how much water and electricity they consume, raising transparency concerns. This information gap makes it difficult for regulators, researchers, and the public to assess the environmental impact of the rapidly growing industry. The refusals have been reported as of late September 2026, highlighting an ongoing accountability challenge. The lack of disclosure is particularly notable given increasing scrutiny over data centers' strain on local power grids and water supplies.

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ProgrammingDEV Community ·

Developer builds 175+ browser-based tools, shares hard lessons on Google indexing

A developer built PlainToolbox, a free collection of over 175 browser-only utilities including calculators, converters, and text tools, all running without a backend or user sign-up. The project uses a shared data-driven engine in Next.js, where each tool is defined as a single object that automatically generates its page, schema, sitemap entry, and FAQ content. Despite initial crawling, Google dropped nearly all tool pages, flagging them as 'Crawled, currently not indexed,' prompting the developer to remove generic tools, add answer-first content blocks, and avoid fake freshness timestamps. The developer noted that on a new domain, technical SEO only establishes eligibility to rank, while backlinks and real-world mentions carry far greater weight. Notably, the site's earliest traceable traffic came from AI assistants rather than traditional search, suggesting niche single-purpose pages may find an audience through that channel first.

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ProgrammingDEV Community ·

Shopify to Support Multiple Barcodes Per Variant, But API Still Returns One

Shopify is preparing to expand its barcode field to hold up to 20 values per product variant, a significant change from the current single-string limitation. The update matters because GS1 standards require distinct GTINs for each packaging level — individual units use EAN-13 barcodes, while cases and cartons require separate ITF-14 identifiers. A purchase order for 240 units, for example, correctly generates 240 item labels, 24 inner labels, and 2 carton labels — three different outputs from one input figure. Until the API is updated to return multiple values, developers are storing inner and carton GTINs in Shopify metafields, which hold the data but enforce none of the packaging hierarchy logic. Using a fallback GTIN across packaging levels is flagged as a critical error, since a mislabeled carton scanning as a single unit can cause downstream warehouse mistakes.

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ProgrammingDEV Community ·

Base Bridge Rated 8/10 Risk: Critical Bugs and Governance Flaws Flagged in $3.15B Protocol

A security assessment of Base Bridge, the primary asset-transfer gateway between Ethereum mainnet and the Base L2 rollup, has assigned it a cumulative risk score of 8 out of 10, classifying it as high risk. The bridge holds approximately $3.15 billion in total value locked, making it a high-value target for potential attackers. Researchers identified critical smart contract vulnerabilities including a re-entrancy flaw in the withdrawal function, missing input validation, and improper nonce handling that could enable replay attacks and double-spending. Governance weaknesses were also flagged, notably an upgradeable proxy contract lacking a multi-signature timelock and an admin key controlled by a single externally owned account. The assessment, prepared by a senior DeFi security researcher and dated September 30, 2026, also highlighted economic design gaps and insufficient monitoring as contributing factors to the bridge's overall systemic risk.

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ProgrammingDEV Community ·

How to Actually Clarify System Design Requirements in Technical Interviews

A software engineering guide published on DEV Community breaks down how to effectively clarify requirements during system design interviews, going beyond the generic advice of simply 'asking for requirements.' The piece uses a URL shortener as a running example to show how targeted questions — such as whether users are authenticated or what the read-to-write traffic ratio is — directly shape architectural decisions. The author distinguishes between functional requirements, which define what users can do, and non-functional requirements, which set performance, availability, and latency constraints. Rather than treating these as abstract checklists, the guide frames each question as a way to uncover consequences that drive design choices, such as separating analytics from the critical redirect path. The core takeaway is that good requirement clarification follows a chain of reasoning: requirement leads to consequence, which leads to architecture.

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ProgrammingDEV Community ·

How to Automate Git Commit Messages Using Custom AI Prompts

Developers often struggle with writing consistent, meaningful Git commit messages, which can result in cluttered and hard-to-navigate project histories. A tutorial published on DEV Community outlines how to set up a custom AI-powered tool to auto-generate commit messages based on staged code changes. The approach uses a command-line utility integrated with LLM APIs such as OpenAI, Anthropic, or Google Gemini, configured via environment variables or a local config file. A carefully crafted prompt file instructs the AI to follow standards like Conventional Commits, enforcing rules around message format, length, and tone. Developers can then review the AI-suggested message and commit it manually or via a shell variable for a more streamlined workflow.

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ProgrammingDEV Community ·

Kev: Open-Source Decision-First AI Model Runs Locally as Jev Alternative

Kev is an open-source project designed as a locally runnable alternative to Jev, an AI model built to make fast, structured decisions rather than generate text. Unlike Jev, which was not released as an open-source model, Kev allows developers to download, inspect, modify, and run it on their own hardware. A hands-on evaluation tested four Kev checkpoints — 0.5B, 0.6B, 0.8B, and 4B parameters — on Apple Silicon using a support-ticket workload, finding that larger models did not simply increase confidence but meaningfully shifted probability distributions, uncertainty, and latency. Kev takes a state and typed questions as input and returns structured decisions with associated probabilities, making it suited for application logic rather than conversational use. The project is available on GitHub and Hugging Face, with larger checkpoints such as Kev-8B and 9B planned for follow-up testing.

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ProgrammingDEV Community ·

A Minimal Go Loop Reveals How CPUs, Threads, and Memory Really Work

A developer running a near-empty infinite loop in Go observed surprising system activity — 100% CPU usage, 5 threads, 22,000 context switches, and over 400 GB of virtual memory — despite writing almost no code. The CPU spikes because the loop never blocks or sleeps, keeping the goroutine perpetually runnable and the processor constantly busy. The 5 OS threads were not created explicitly in the source code; they are part of the Go runtime's internal machinery, which manages goroutines, scheduling, memory, and garbage collection automatically. Above the Go runtime sits the OS scheduler, which arbitrates CPU access among all threads from every running process, causing the thousands of context switches observed. The experiment illustrates that a Go program is far more than its source code — the runtime and OS together handle the low-level work that developers never have to write themselves.

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ProgrammingDEV Community ·

Five Enterprise AI Gateways That Lead Multi-Model Routing in 2026

As enterprise AI deployments grow more complex, AI gateways have become critical infrastructure that sits between applications and multiple LLM providers, centralizing routing, governance, and observability. No single model can optimally balance cost, speed, and capability for every task, making multi-model routing strategies essential for production systems. Bifrost leads for high-performance, self-hosted or in-VPC deployments, while LiteLLM is favored for its broad provider support in open-source environments. Kong, Cloudflare, and Vercel serve teams already embedded in their respective ecosystems, offering AI routing at the API or edge layer. Key evaluation criteria for enterprises include routing strategy, deployment model, latency overhead, governance controls, and observability features.

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ProgrammingDEV Community ·

How a Single Malicious Commit Can Compromise a Vite-React-TypeScript App

A security analysis explores what happens when a malicious commit reaches production in a Vite, React, and TypeScript frontend application. Once hostile JavaScript is deployed, it runs under the site's origin in every affected visitor's browser, giving it the same privileges as the legitimate app — enabling keystroke capture, storage access, API calls, and data exfiltration. Beyond the browser, malicious repository code can also execute during CI/CD build steps, potentially exposing secrets, cloud credentials, and deployment tokens through npm lifecycle hooks. The research outlines a tiered threat model ranging from read-only repository access to full backend compromise, depending on CI permissions and API security. The findings serve as a threat-modeling and audit guide for frontend teams to assess and reduce their supply-chain exposure.

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