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HTML is getting cool again: Meet the Invoker Commands API
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DEV Community · Technology

HTML is getting cool again: Meet the Invoker Commands API

For years, frontend development has had a slightly embarrassing relationship with HTML. We all read about semantic HTML, we talk about using the right landmarks, the right attributes, accessible forms, and meaningful elements. And then we go back to writing React. While the whole industry is obsess...

Alexandra
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How do you stop Claude Code from writing files?
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DEV Community · Technology

How do you stop Claude Code from writing files?

I spent a week trying to keep a coding agent out of one directory, and I lost that argument at every layer that lives inside the agent. The markdown rule folded when I claimed the repo owner was making an exception. The deny rule covered git commit and not git -C. The flag that turns off the write...

Charles Hasse
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How I Stop Webhook Replay Attacks in Node.js & PostgreSQL
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DEV Community · Technology

How I Stop Webhook Replay Attacks in Node.js & PostgreSQL

Handling payment webhooks sounds straightforward—until network retries hit your server three times in a row, or an attacker intercepts a valid payload and tries to credit their balance twice. Validating signatures is step one, but it won't protect you from a replay attack where a valid, signed payl...

Doaa H Alshawwa
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Why model.fit() Is the Least Interesting Line in an ML Trading System
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DEV Community · Technology

Why model.fit() Is the Least Interesting Line in an ML Trading System

Run 51 in an HMM sweep never reached training. The data pull had 306 bars. The walk-forward planner left 172 for training. The HMM needed at least 362. There was no parameter I could move in the UI to make the run valid. At least it failed loudly. I checked the HMM first. Nothing was wrong with i...

Whetlan
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Understanding Zippers
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DEV Community · Technology

Understanding Zippers

When working with tree-structured data, we often need to navigate to a specific node and modify it. In imperative languages, this is usually straightforward thanks to mutable state and parent pointers. In functional languages, however, immutability makes this pattern less obvious. In this post, we’...

Julian Zhou
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The DevOps Roadmap I Wish Someone Had Handed Me on Day One
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DEV Community · Technology

The DevOps Roadmap I Wish Someone Had Handed Me on Day One

I'm a software engineering student, about 16 months out from graduation, and somewhere in the last year "learn DevOps" quietly turned from a side interest into the actual plan — cloud, Kubernetes, Terraform, the whole stack, with an eye on eventually working in Europe. Along the way I built myself a...

Dehemi Fabio
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Mastering Playwright Test Fixtures for Robust E2E Tests
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DEV Community · Technology

Mastering Playwright Test Fixtures for Robust E2E Tests

Introduction Writing robust and maintainable end-to-end tests can often feel like a juggling act. You need a clean environment for each test, shared resources handled efficiently, and code that's easy to reuse without leading to a tangled mess. This is where Playwright Test Fixtures shine...

Pratham Rathod
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Downloading and Running a Kali Linux VM in VirtualBox on Windows
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DEV Community · Technology

Downloading and Running a Kali Linux VM in VirtualBox on Windows

By the end of this guide you will have VirtualBox installed and a Kali Linux virtual machine imported and running — an isolated environment for security practice that leaves your host system untouched. Prerequisites Windows 11 Pro (64-bit) At least 8 GB RAM, so you can give the VM 4 GB...

MuneebAhmedKhan-writing
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Making AI Coding Agents Actually Good at Software Engineering
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DEV Community · Technology

Making AI Coding Agents Actually Good at Software Engineering

AI coding agents generate decent code. But decent ≠ production-ready. They miss the stuff experienced engineers know instinctively — accessibility standards, proper auth flows, database reliability patterns, API design conventions. The gap between "it works" and "it's production-grade" is real....

Debabrata Saha
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I made a Symfony bundle for masking sensitive data
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DEV Community · Technology

I made a Symfony bundle for masking sensitive data

I recently released a small open-source Symfony bundle called MaskedBundle. The reason for building it was quite simple: logs are useful, but sometimes they can contain values that should not be there. I wanted something I could reuse in Symfony projects to mask sensitive values before they reach...

Alkin Veysal
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5 Things I Learned While Automating a Repetitive Business Process
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DEV Community · Technology

5 Things I Learned While Automating a Repetitive Business Process

Ever looked at a daily task and thought: “Why are we still doing this manually?” I did. One of the processes I worked on involved a daily assignment report. The old process was simple, but repetitive: Portal → Fetch assignments → Update report → Update SharePoint Every day. 🔄 So I asked mysel...

Shraddha Agrawal
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The Exact Funnel I Use to Get Free CLI Tools Their First Users
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DEV Community · Technology

The Exact Funnel I Use to Get Free CLI Tools Their First Users

Every open-source tool has the same brutal first 90 days: zero users, zero signal, no idea whether anything works. I have shipped several free CLI tools and browser tool sets. This is the exact funnel I use — no ads, no paid growth, no "build in public" theater. Just a repeating sequence of small,...

ke jia
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Understanding the Git Workflow: Working Directory, Staging, Commit and Push
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DEV Community · Technology

Understanding the Git Workflow: Working Directory, Staging, Commit and Push

Introduction Git is a version control system that tracks changes in code. When writing code we need to save every significant change or feature that does a certain function as a commit that can be reverted to if we ever need that instance of the code. This helps programmers to traverse co...

Waweru
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Why free chess analysis is always capped at one game a day
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DEV Community · Technology

Why free chess analysis is always capped at one game a day

Most free chess game review gives you one game per day. Chess.com works that way, and so does almost every smaller site offering the feature. I assumed for a long time that this was just a paywall placed where it hurts. It is partly that. But there is a real cost sitting behind the cap, and once I...

Pukar Khanal
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Cómo solucionar el error “Enable JavaScript and cookies to continue”
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DEV Community · Technology

Cómo solucionar el error “Enable JavaScript and cookies to continue”

Cómo solucionar el error “Enable JavaScript and cookies to continue” Este mensaje aparece cuando Cloudflare (u otro proxy de seguridad similar) bloquea la solicitud porque detecta que el cliente no cumple con los requisitos mínimos de seguridad: JavaScript deshabilitado o cookies deshabil...

Erick Eduardo Ramos
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Similarity isn't relevance: the hard part of semantic search
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DEV Community · Technology

Similarity isn't relevance: the hard part of semantic search

Here's a dirty secret of search: "the closest match" and "the most useful result" are not the same thing. Return the mathematically nearest document and you'll often hand someone something technically related and practically useless. Relevance is a harder problem than similarity — and it's where goo...

Divyakush Punjabi
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Autonomous AI Study Notes: A Multi-Agent System with LangGraph and Streamlit
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DEV Community · Technology

Autonomous AI Study Notes: A Multi-Agent System with LangGraph and Streamlit

This post is my submission for DEV Education Track: Build Multi-Agent Systems with ADK. What I Built I built an Autonomous Multi-Agent Handwritten Notes Generator. Students and educators often need clean, visual study guides that resemble real handwritten notes, but manually summarizin...

Himanshu Yeole
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